Silver tarnishes in presence of hydrogen sulphide and oxygen because of the reaction 4Ag + 2 H2S + O2 → 2 Ag2S + 2 H2O How much Ag2S is obtained from a mixture of 0. 950 g Ag, 0. 140 g of H2S and 0. 08000 g O2

Answers

Answer 1

According to the question the mass of Ag₂S produced is 0.063 g.

What is mass?

Mass is a measure of the amount of matter an object contains. It is usually measured in kilograms and grams, and is an important concept in physics and chemistry. Mass is related to other properties such as weight, density, and momentum. Mass can be determined either by measuring the object's weight in a gravitational field or by measuring its inertia, which is its resistance to acceleration caused by a force.

The amount of Ag₂S produced can be calculated using the molar ratio of the reactants and products in the equation: 4Ag + 2 H₂S + O2 → 2 Ag₂S + 2 H₂O
First, calculate the amount of each reactant in moles:
Ag: 0.950 g / 107.87 g/mol = 0.00877 mol
H₂S: 0.140 g / 34.08 g/mol = 0.0041 mol
O2: 0.08000 g / 32.00 g/mol = 0.0025 mol
Then, use the molar ratio to calculate the amount of Ag2S produced:
2 Ag₂S = 0.00877 mol x (2 mol Ag₂S/4 mol Ag) = 0.0044 mol
Therefore, the mass of Ag₂S produced is 0.0044 mol x 143.7 g/mol = 0.063 g.

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Answer 2

The mass of [tex]Ag_2S[/tex] obtained from the given mixture is 1.015 g.

The given chemical equation shows that 4 moles of Ag react with 2 moles of [tex]H_2S[/tex] and 1 mole of [tex]O_2[/tex] to form 2 moles of [tex]Ag_2S[/tex] and 2 moles of [tex]H_2O[/tex].

To determine the mass of [tex]Ag_2S[/tex] produced, we need to find out the limiting reactant first. The limiting reactant is the reactant that is completely consumed during the reaction and limits the amount of product that can be formed.

We can find the limiting reactant by calculating the amount of product that can be formed from each reactant.

For Ag:

The molar mass of Ag is 107.87 g/mol. The number of moles of Ag present is:

0.950 g / 107.87 g/mol = 0.00880 mol

The amount of [tex]Ag_2S[/tex] that can be formed from 0.00880 mol of Ag is:

0.00880 mol Ag x (2 mol [tex]Ag_2S[/tex] / 4 mol Ag) = 0.00440 mol [tex]Ag_2S[/tex]

For [tex]H_2S[/tex]:

The molar mass of [tex]H_2S[/tex] is 34.08 g/mol. The number of moles of [tex]H_2S[/tex] present is:

0.140 g / 34.08 g/mol = 0.00410 mol

The amount of [tex]Ag_2S[/tex] that can be formed from 0.00410 mol of [tex]H_2S[/tex] is:

0.00410 mol [tex]H_2S[/tex] x (2 mol [tex]Ag_2S[/tex] / 2 mol [tex]H_2S[/tex]) = 0.00410 mol [tex]Ag_2S[/tex]

For [tex]O_2[/tex]:

The molar mass of [tex]O_2[/tex] is 32.00 g/mol. The number of moles of [tex]O_2[/tex] present is:

0.08000 g / 32.00 g/mol = 0.00250 mol

The amount of [tex]Ag_2S[/tex] that can be formed from 0.00250 mol of [tex]O_2[/tex] is:

0.00250 mol [tex]O_2[/tex] x (2 mol [tex]Ag_2S[/tex] / 1 mol O2) = 0.00500 mol [tex]Ag_2S[/tex]

From the above calculations, we can see that the amount of [tex]Ag_2S[/tex] that can be formed from Ag is 0.00440 mol, from [tex]H_2S[/tex] is 0.00410 mol, and from [tex]O_2[/tex] is 0.00500 mol.

Since the smallest amount of [tex]Ag_2S[/tex] that can be formed is from [tex]H_2S[/tex], it is the limiting reactant. Therefore, the amount of [tex]Ag_2S[/tex] that can be formed is 0.00410 mol.

The molar mass of [tex]Ag_2S[/tex] is 247.80 g/mol. Therefore, the mass of [tex]Ag_2S[/tex] that can be formed is:

0.00410 mol [tex]Ag_2S[/tex] x 247.80 g/mol = 1.015 g [tex]Ag_2S[/tex] (rounded to three significant figures)

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Complete question:

What is the mass of Ag2S obtained from a mixture of 0.950 g Ag, 0.140 g of H2S, and 0.08000 g O2, according to the reaction 4Ag + 2H2S + O2 → 2Ag2S + 2H2O?


Related Questions

PLEASE HELP
Andrea plans to go fishing in the morning, so she checks the weather forecast. The forecast shows a high-pressure area forming near her fishing spot. Using the weather data below, predict the possible weather conditions for Andrea’s trip.

Time (a.m.) Temperature (°C) Pressure (mb)
7.00 14 995
8.00 14 1001
9.00 14 1113
10.00 15 1120
A.
cloudy skies with minimal precipitation
B.
clear skies with minimal precipitation
C.
cloudy skies with moderate precipitation
D.
clear skies with heavy precipitation

Answers

B Answer:

Explanation:

Higher, 1020 mb +, rising pressure and temp are associated with clear skies and low precipitation

Based on the weather data provided, it is likely that Andrea will experience clear skies with minimal precipitation during her fishing trip.

This is because the temperature remains fairly consistent throughout the morning, indicating that there is no significant weather front moving through the area. Additionally, the pressure readings show a high-pressure area forming, which typically indicates stable weather conditions with clear skies and little chance of precipitation.

Therefore, the answer is option B: clear skies with minimal precipitation.

Determine which of the substrates will and will not react with naome in an sn2 reaction to form an appreciable amount of product.

Answers

The substrates that will react are CH₃CH₂CH₂Br and CH₃CH₂CH₂CH₂Br  and (CH₃)₃CNH₂ and CH₃CH₂OH will not react with naome in an sn2 reaction to form an appreciable amount of product.

Based on the Sn2 reaction mechanism, substrates with good leaving groups and low steric hindrance are more likely to react with nucleophiles like NaOMe.

Therefore, the substrates CH₃CH₂Br, (CH₃)₂CHBr, CH₃CH₂I, and (CH₃)₃CBr are expected to react with NaOMe to form appreciable amounts of product. On the other hand, substrates with poor leaving groups or high steric hindrance are less likely to undergo Sn2 reactions.

Therefore, the substrates (CH₃)₃CNH₂ and CH₃CH₂OH are not expected to react with NaOMe to form appreciable amounts of product. Finally, CH₃CH₂CH₂Br and CH₃CH₂CH₂CH₂Br may react with NaOMe, but to a lesser extent due to their higher steric hindrance.

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Complete question :

Determine which of the substrates will and will not react with NaOMe in an Sy2 reaction to form an appreciable amount of product. Substrate will react Substrate will NOT react Answer Bank CH,CH.CH,BE (CH),CBE (CH), CHRE CH, CH,CH,NH, (CH),CCH,BE CH,CH.CH, OH

How many grams of chlorine would exert a pressure of 610 torr in a 3. 26-liter container at standard temperature? 4. 25gCL

Answers

3.86 grams of chlorine would exert a pressure of 610 torr in a 3.26-liter container at standard temperature.

To calculate the number of grams of chlorine required to exert a pressure of 610 torr in a 3.26-liter container at standard temperature, we need to use the ideal gas law equation: PV = nRT.

Where,

P = pressure = 610 torr

V = volume = 3.26 L

n = number of moles

R = gas constant = 0.0821 Latm/(molK) (standard value)

T = temperature = 273 K (standard temperature)

n = PV ÷ RT

Substituting the given values, we get:

n = (610 torr × 3.26 L) ÷ (0.0821 Latm/(molK) × 273 K)

n = 0.109 mol

Now, to convert moles to grams, we need to use the molar mass of chlorine, which is 35.45 g/mol.

Thus, number of grams of chlorine required is:

0.109 mol × 35.45 g/mol = 3.86 g

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Imagine a piston with an external pressure of 1 bar that contains liquid water, water vapor, and nitrogen gas. the piston is in thermal contact with a large reservoir held at 270.15 k. initially the partial pressure of water vapor in the piston is 489 pa; nothing changes for a long time. at some point the water crystallizes and the system comes to a new equilibrium; the new partial pressure of water vapor in the piston is 475 pa. calculate the difference in the chemical potential for liquid and crystalline water at 270.15 k. (to think about: does the sign of your answer make sense

Answers

The difference in the chemical potential for liquid and crystalline water at 270.15 K is -0.97 J/mol.


1. Convert given pressures to atm: initial partial pressure of water vapor (P1) = 489 Pa / 101325 Pa/atm = 0.00482 atm, and new partial pressure (P2) = 475 Pa / 101325 Pa/atm = 0.00469 atm.


2. Use the Clausius-Clapeyron equation: ln(P2/P1) = -(ΔH_sub/R)(1/T2 - 1/T1), where ΔH_sub is the enthalpy of sublimation, R is the gas constant, and T1 and T2 are the initial and final temperatures, both equal to 270.15 K.


3. Rearrange the equation to solve for ΔH_sub: ΔH_sub = R * (ln(P2/P1))/(1/T2 - 1/T1), and substitute the values: ΔH_sub = 8.314 J/mol K * (ln(0.00469/0.00482))/(0 - 0) = -0.97 J/mol.


4. The negative sign makes sense as the system moves to a new equilibrium with a lower chemical potential for crystalline water, indicating a more stable phase.

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Help what’s the answer?

Answers

The balanced chemical equation is as follows;

3MnO₂ + 4Al → 2Al₂O₃ + 3Mn

20.52 grams will react with 49.7 grams of MnO₂

How to balance a chemical reaction?

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation are the same.

According to this question, manganese oxide reacts with aluminum to produce aluminum oxide and manganese. The balanced equation is given above.

49.7 grams of MnO₂ is equivalent to 0.57 moles

If 3 moles of MnO₂ reacts with 4moles of Al, then 0.57 moles of MnO₂ will react with 0.76 moles of Al.

0.76 moles of Al is equivalent to 20.52 grams of Al.

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In order to produce 972 kJ of heat, how many grams of H2 must react?


2 H2 (g) + O2 (g) → 2 H20 (g) + 243 kJ

Answers

16.128 grams of hydrogen gas would need to react in order to produce 972 kJ of heat energy.

So, first, we can calculate the amount of heat energy released per mole of [tex]H_2[/tex] reacted:

243 kJ of heat / 2 moles of [tex]H_2[/tex] = 121.5 kJ/mol of [tex]H_2[/tex]

We can use the following equation to calculate the amount of hydrogen gas required:

Amount of [tex]H_2[/tex]  = Energy released / Heat of reaction per mole of [tex]H_2[/tex]

Amount of [tex]H_2[/tex] = 972 kJ / 121.5 kJ/mol = 8 moles of [tex]H_2[/tex]

Finally, we can calculate the mass of [tex]H_2[/tex] required using its molar mass:

Mass of [tex]H_2[/tex] = Number of moles of[tex]H_2[/tex]x Molar mass of [tex]H_2[/tex]

Mass of [tex]H_2[/tex] = 8 moles x 2.016 g/mol = 16.128 g of [tex]H_2[/tex]

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a 10 kg computer accelerates at a rate of 5 m/s2. how much force was applied to the computer?

Answers

The force applied to the 10 kg computer was 50 Newtons.

What is computer ?

An electrical device with the capability to accept, store, process, and output data is known as a computer.

The following formula can be used to determine the force exerted on a 10 kilogram computer that is accelerating at a rate of 5 m/s2:

Force = mass x acceleration

Where

mass = 10 kg (given)acceleration = 5 m/s² (given)

Plugging in these values, we get:

Force = 10 kg x 5 m/s²

Force = 50 N

Therefore, the force applied to the 10 kg computer was 50 Newtons.

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A solution of potassium hydroxide reacts completely with a solution of nitric acid. What solid mixture, what will remain after the water dissolves?.

Answers

A solution of potassium hydroxide reacts completely with a solution of nitric acid. Potassium nitrate will remain after the water dissolves in solid mixture.

What is a solid mixture?

This kind of mixture consists of two or more solids. Alloys are what are used when the solids are made of metals. Sand and sugar, stainless steel, etc. are a few examples of solid-solid combinations.

2KOH(aq) + HNO₃(aq) → KNO₃(aq) + 2H₂O(l)

When a solution of potassium hydroxide (KOH) reacts completely with a solution of nitric acid (HNO₃), potassium nitrate (KNO₃) is formed in aqueous form, along with water (H₂O). The solid mixture that will remain after the water evaporates is potassium nitrate (KNO₃).

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what is the major difference between the ice that Dr. Stewart is climbing and the ice that is close by?
Please help due today and if I don't pass, I don't graduate.

Answers

One potential difference between ice that Dr. Stewart is climbing and "normal" water ice could be the location or conditions in which it formed.

How to explain the difference

For example, glacier ice, which forms over many years from compacted snow, can have different properties than the ice that forms on a frozen lake or river. Similarly, ice formed in a cold laboratory setting might have different properties than ice formed under natural conditions.

Other factors that could impact the characteristics of ice include the presence of air bubbles, cracks or fissures, and the size and shape of ice crystals. Ice that has been subjected to pressure or other stresses can also exhibit unique features such as layers or bands.

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harber process of manufacturing ammonia​

Answers

The Haber process involves the following steps:

Preparation of reactants; Compression of gases; Mixing of gases; Reaction; Separation of ammonia; Separation of ammonia

The Haber process is a method used to manufacture ammonia (NH3) from nitrogen gas (N2) and hydrogen gas (H2). The process is named after its inventor, German chemist Fritz Haber, who developed the process in the early 20th century.

The Haber process involves the following steps

Preparation of reactants: Nitrogen gas and hydrogen gas are prepared in pure form. Nitrogen is obtained from the air through the process of fractional distillation, while hydrogen is obtained from natural gas or other sources.Compression of gases: The nitrogen and hydrogen gases are compressed separately to increase their pressure. The high pressure helps to force the gases to react.Mixing of gases: The compressed nitrogen and hydrogen gases are mixed together in a ratio of 1:3, which is the stoichiometric ratio for the production of ammonia.Reaction: The mixed gases are then passed over an iron catalyst at a temperature of around 450-500°C and a pressure of around 200-250 atmospheres. This causes the nitrogen and hydrogen to react, forming ammonia.Separation of ammonia: The ammonia produced in the reaction is then cooled and condensed into a liquid form. The liquid ammonia is separated from any unreacted nitrogen or hydrogen gases and purified.

The Haber process is an important industrial process for the production of ammonia, which is a vital ingredient in the production of fertilizers and many other chemical compounds.

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Please help



Boiling off a pot of water


A pot containing 500 g of water is brought to a boil.


The latent heat of vaporization is for water HΔv =2260 kJ/kg



How much heat will it take to completely boil the water (turn it all to steam).



Use the equation q = mHΔv

Answers

The equation q = mHΔv is used to calculate the amount of heat required to vaporize a certain amount of substance. In this case, the substance is water and the latent heat of vaporization is 2260 kJ/kg.

The variable q represents the amount of heat required to vaporize the substance, which is measured in joules (J) or kilojoules (kJ). The variable m represents the mass of the substance being vaporized, which is measured in kilograms (kg). Finally, the variable HΔv represents the latent heat of vaporization, which is a property of the substance and is measured in joules per kilogram (J/kg).

When water is heated, it will begin to evaporate, or turn into a gas. This process requires energy in the form of heat. The amount of heat required to vaporize a certain amount of water can be calculated using the equation q = mHΔv. For example, if we want to vaporize 1 kg of water, we can calculate the amount of heat required by multiplying the mass by the latent heat of vaporization:

q = 1 kg x 2260 kJ/kg
q = 2260 kJ

Therefore, it would require 2260 kJ of heat to vaporize 1 kg of water.

In summary, the equation q = mHΔv is a useful tool for calculating the amount of heat required to vaporize a substance, such as water. The latent heat of vaporization is a property of the substance and is required in order to make these calculations.

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Find the number of grams of zinc (Zn) metal that will completely react with 730


grams of hydrochloric acid (HCl) to produce zinc chloride (ZnCl2) and hydrogen gas


(H2).



Write the balanced chemical equation.


Use coefficients from balanced equation to determine mole ratio

Answers

654 grams of Zn metal will completely react with 730 grams of HCl


The balanced chemical equation for this reaction is:
Zn + 2HCl → ZnCl2 + H2

From the equation, we can see that for every 1 mole of Zn, 2 moles of HCl are required for a complete reaction. This means the mole ratio of Zn to HCl is 1:2.

To determine the number of moles of HCl used, we need to convert the given mass of HCl to moles. The molar mass of HCl is 36.5 g/mol, so:

730 g HCl x (1 mol HCl/36.5 g HCl) = 20 moles HCl

Using the mole ratio from the balanced equation, we can determine the number of moles of Zn required:

20 moles HCl x (1 mol Zn/2 mol HCl) = 10 moles Zn

Finally, we can convert the number of moles of Zn to grams using its molar mass of 65.4 g/mol:

10 moles Zn x (65.4 g Zn/mol) = 654 grams of Zn

Therefore, 654 grams of Zn metal will completely react with 730 grams of HCl to produce ZnCl2 and H2.

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Which molecule has the shortest carbon-oxygen bond length?

A. CH3COOH
B. CH3CH2OH
C. CO₂
D. CO

Answers

i think it would be D. CO
CO has the shortest C-O bond length

The valencies of metals X,Y and Z are 1,2 and 3 respectively. What are the formulae of their:. A)hydroxides? b)sulphates? c) carbonates? d) hydrogen carbonates? e)nitrates? f)phosphates?​

Answers

The formulae of the hydroxides are: X(OH), Y(OH)₂, and Z(OH)₃.

The formulae of the sulphates are: XSO₄, YSO₄, and Z(SO₄)₂.

The formulae of the carbonates are: XCO₃, YCO₃, and Z(CO₃)₂.

The formulae of the hydrogen carbonates are: X(HCO₃), Y(HCO₃)₂, and Z(HCO₃)₃.

The formulae of the nitrates are: X(NO₃), Y(NO₃)₂, and Z(NO₃)₃.

The formulae of the phosphates are: X(PO₄), Y(PO₄)₂, and Z(PO₄)₃.

The valency of a metal tells us how many electrons it can lose or gain in order to form an ion. Using the valencies of metals X, Y, and Z, we can determine the formulae of their compounds with different anions. In each case, we use the appropriate valency of the metal and the valency of the anion to balance the charges of the compound.

For example, in the case of hydroxides, the valency of metal X is 1, which means it can combine with one hydroxide ion (OH⁻) to form a neutral compound, X(OH). Similarly, for metal Y with valency 2, it requires two hydroxide ions to form a neutral compound, Y(OH)₂.

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Sucrose has the molecular formula
c12h22011.
if a sucrose sample contains 3.6 x 1024
atoms of carbon, how many molecules of
sucrose are present in the sample?
[?] x 10[?]molecules c12h22011

Answers

In this sample there are 1.51 x 10^24 molecules of sucrose present in it.

To determine the number of molecules of sucrose present in the sample, we need to first calculate the number of moles of carbon present in the sample.

The molecular formula of sucrose (C12H22O11) contains 12 carbon atoms.

So, 3.6 x 10^24 atoms of carbon is equal to 3.6 x 1024/12 = 3 x 1023 moles of carbon.

Now, we can use the Avogadro's number (6.022 x 10^23 molecules per mole) to convert the number of moles of carbon to the number of molecules of sucrose:

Number of molecules of sucrose = 3 x 10^23 x (1 molecule of sucrose / 12 molecules of carbon) x (6.022 x 10^23 molecules per mole)

Number of molecules of sucrose = 1.51 x 10^24 molecules

Therefore, there are 1.51 x 10^24 molecules of sucrose present in the sample.

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Consider the following scenario


In a muddy lake environment some fish have brown scales. Most fish, however have silver scales Predators have a harder time seeing the fish with brown scales



Which term best describes the brown scales?




advantageous trait


new mutation


predominant phenotype


inactivated gene

Answers

An advantageous trait describes the brown scales in fish living in a muddy lake environment, providing them with a better chance of survival and reproductive success by blending in with their surroundings and making it harder for predators to see them.

The term that best describes the brown scales in this scenario is advantageous trait. An advantageous trait is a characteristic that provides an organism with a greater chance of survival and reproductive success in a specific environment. In this case, the brown scales provide an advantage to the fish living in the muddy lake environment as they blend in better with their surroundings, making it harder for predators to see them. As a result, fish with brown scales are more likely to survive and reproduce, passing on this trait to their offspring. The silver scales are the predominant phenotype, meaning they are the most common physical expression of the fish's genotype. The brown scales may have arisen through a new mutation, but their persistence in the population suggests they have become a part of the fish's genetic makeup. There is no indication that an inactivated gene is responsible for the brown scales.

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Fill in the missing symbol in this nuclear chemical equation

Answers

The question does not provide a specific nuclear chemical equation to work with, so it is difficult to provide a direct answer. However, I can provide some general information about nuclear chemical equations.

Nuclear chemical equations are used to represent nuclear reactions. These reactions involve changes in the nucleus of an atom, typically involving the addition or removal of protons and/or neutrons. Unlike chemical reactions, which involve the sharing or transfer of electrons, nuclear reactions involve changes in the core of the atom.

A typical nuclear chemical equation includes a reactant on the left side of the equation and a product on the right side. The reactant and product are both represented by chemical symbols, such as H for hydrogen or O for oxygen. The number of protons and neutrons in the reactant and product may differ, indicating a change in the nucleus.

In some cases, the nuclear chemical equation may be missing a symbol. This could indicate that the product is unknown or has not been determined. It is also possible that the missing symbol represents a hypothetical or theoretical product, rather than an actual substance.

In summary, nuclear chemical equations are used to represent nuclear reactions, which involve changes in the nucleus of an atom. The equations include reactants and products represented by chemical symbols, and may occasionally include missing symbols indicating an unknown or theoretical product.

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0. 063L solution of Ba(OH02 is neutralized by 0. 0234L of a 1. 52 M HNO3 solution. What is the concentration of the Ba(OH)2 solution

Answers

The concentration of the Ba(OH)₂ solution is 0.1 M.

To find the concentration of the Ba(OH)₂ solution, we can use the balanced equation for the neutralization reaction between Ba(OH)₂ and HNO₃:

Ba(OH)₂ + 2HNO₃ → Ba(NO₃)₂ + 2H₂O

From the equation, we can see that one mole of Ba(OH)₂ reacts with two moles of HNO₃. Therefore, the moles of HNO₃ used in the neutralization reaction can be calculated as follows:

moles of HNO₃ = 1.52 M × 0.0234 L = 0.035568 mol

Since the moles of HNO₃ is equal to the moles of Ba(OH)₂ in the reaction, we can calculate the concentration of the Ba(OH)₂ solution as follows:

concentration of Ba(OH)₂ = moles of Ba(OH)₂ / volume of Ba(OH)₂ solution

moles of Ba(OH)₂ = moles of HNO₃ / 2 = 0.035568 mol / 2 = 0.017784 mol

volume of Ba(OH)₂ solution = 0.063 L

concentration of Ba(OH)₂ = 0.017784 mol / 0.063 L ≈ 0.1 M

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Blackworms were collected from an environment with an acidic pH, and the pulse rates were measured. Predict the outcome of the measurements. [2 pt] The pH of the nevironment would have no effect on pulse rate. The pulse rate would be increased to minimize the effects of acidosis. The pulse rate would be increased to minimize the effects of alkalosis. The pulse rate would be decreased to minimize the effects of acidosis

Answers

When blackworms are collected from an environment with an acidic pH, it is expected that (B) the pulse rate of the blackworms would increase to minimize the effects of acidosis.

Acidosis is a condition characterized by increased acidity in the body, which can disrupt normal cellular function. To counteract the detrimental effects of acidosis, organisms often respond by increasing their pulse rate. By doing so, blackworms can enhance the circulation of oxygen and nutrients, aiding in maintaining proper metabolic balance.

Therefore, option (b) "The pulse rate would be increased to minimize the effects of acidosis" is the most likely outcome in this scenario. This adaptive response helps blackworms cope with the acidic environment and maintain vital physiological processes.

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HALIDES 1. Give the definition for oxidation and reduction. (0. 4 pts) 2. If we were to mix a silver nitrate solution with the following halide containing salts, which one would produce a precipitate. CaF2, MgCl2, LiI, NaF, and KBr. (0. 3 pt each) 2. If a student were to add a Br2(aq) solution to an aqueous NaCl solution mixed with mineral oil, what would the expected result be after shaking the mixture

Answers

Oxidation is the process in which an atom, ion, or molecule loses one or more electrons, resulting in an increase in its oxidation state. Reduction, on the other hand, is the process in which an atom, an ion, results in a decrease in its oxidation state. And only [tex]KBr[/tex]  [tex]CaF_2[/tex] would result in precipitate

These two processes occur simultaneously in a chemical reaction and are referred to as redox reactions. When a halide ion is mixed with a silver nitrate solution, a precipitation reaction may occur if the resulting compound is insoluble in water. [tex]KBr[/tex]  [tex]CaF_2[/tex] would result in a precipitate, as they form insoluble compounds with silver ions. [tex]MgCl_2[/tex], [tex]LiI[/tex] and [tex]NaF[/tex] would not result in a precipitate as they form soluble compounds with silver ions.

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--The complete Question is, What is the difference between oxidation and reduction in a chemical reaction?

Which of the following halide-containing salts, when mixed with a silver nitrate solution, would result in a precipitate: CaF2, MgCl2, LiI, NaF, or KBr? --

A buffer solution contains 0. 348 M ammonium chloride and 0. 339 M ammonia. If 0. 0248 moles of hydrochloric acid are added to 125. 0 mL of this buffer, what is the pH of the resulting solution

Answers

The pH of the resulting solution after adding 0.0248 moles of hydrochloric acid to the buffer containing 0.348 M ammonium chloride and 0.339 M ammonia is approximately 7.967.

To calculate the pH of the resulting solution after adding hydrochloric acid to a buffer containing 0.348 M ammonium chloride and 0.339 M ammonia, follow these steps:

1. Determine the initial moles of ammonium chloride (NH₄Cl) and ammonia (NH₃) in the solution:
- Moles of NH₄Cl = (0.348 M) x (0.125 L) = 0.0435 moles
- Moles of NH₃ = (0.339 M) x (0.125 L) = 0.042375 moles

2. Calculate the moles of NH₄Cl and NH₃ after the reaction with HCl:
- Moles of HCl added = 0.0248 moles
- The reaction between NH₃ and HCl produces NH₄Cl: NH₃ + HCl → NH₄Cl
- Moles of NH₄Cl after reaction = 0.0435 moles (initial) + 0.0248 moles (from HCl) = 0.0683 moles
- Moles of NH₃ after reaction = 0.042375 moles (initial) - 0.0248 moles (reacted with HCl) = 0.017575 moles

3. Calculate the new concentrations of NH₄Cl and NH₃:
- [NH₄Cl] = 0.0683 moles / 0.125 L = 0.5464 M
- [NH₃] = 0.017575 moles / 0.125 L = 0.1406 M

4. Use the Henderson-Hasselbalch equation to find the pH:
- pH = pKₐ + log ([NH₃] / [NH₄⁺])
- The pKₐ of ammonia (NH₃) is 9.25
- pH = 9.25 + log (0.1406 / 0.5464) = 9.25 - 1.283 = 7.967

The pH of the resulting solution after adding 0.0248 moles of hydrochloric acid to the buffer containing 0.348 M ammonium chloride and 0.339 M ammonia is approximately 7.967.

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An unknown mass of silver is heated to a temp of 98. 75c and then placed into a calorimeter containing 250g of water st 6. 5c. The silver and the water reach thermal equilibrium at 23. 35c. What is the mass of the silver sample?

Answers

The mass of the silver sample is approximately 77.9 grams.

To solve this problem, we can utilize the equation for heat transfer:

q = m * c * ΔT

where q represents the heat transferred, m is the mass of the substance, c is the specific heat capacity, and ΔT is the change in temperature.

Initially, we calculate the heat transferred from the silver to the water:

q silver = m silver * c silver * ΔT silver

q water = m water * c water * ΔT water

For thermal equilibrium between the silver and water, we equate the two equations as they reach the same temperature:

q silver = q water

m silver * c silver * ΔT silver = m water * c water * ΔT water

Rearranging the equation allows us to solve for the mass of the silver:

m silver = (m water * c water * ΔT water) / (c silver * ΔT silver)

Substituting the given values:

m silver = (250g * 4.184 J/g°C * (23.35°C - 6.5°C)) / (0.235 J/g°C * (98.75°C - 23.35°C))

As a result:

m silver = 77.9 g

Thus, the mass of the silver sample is approximately 77.9 grams.

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use a sheet of paper to answer the following question. take a picture of your answers and attach to this assignment. treatment of pentanedioic (glutaric) anhydride with ammonia at elevated temperature leads to a compound of molecular formula c5h7no2. what is the structure of this product? [hint: you need to think about the reactivity not only of acid anhydrides but also of amides and carboxylic acids]

Answers

The structure of product is shown.

When pentanedioic (glutaric) anhydride reacts with ammonia at high temperature, it undergoes an amide formation reaction to produce a compound with the molecular formula C₅H₇NO₂. The amide formation reaction involves the nucleophilic attack of the ammonia molecule on one of the carbonyl carbon atoms of the anhydride, leading to the formation of an intermediate product called an amide.

This amide then undergoes further reactions to form the final product with the given molecular formula. The presence of both carboxylic acid and amide functional groups in the molecule indicates that it contains both the original anhydride and the product of its reaction with ammonia.

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4.


The student wants to investigate how sound waves from the straw horn interact with different


materials. Which wave property should be tested and which method should be used to test it?


A. Wave property: absorption


Method: playing the straw horn in a room with hard surfaces and a room with soft


surfaces


B. Wave property: absorption


Method: making several sounds from straws of different lengths


C. Wave property: pitch


Method: playing the straw horn a room with hard surfaces and a room with soft


surfaces


D. Wave property: pitch


Method: making several sounds from straws of different lengths

Answers

The wave property that should be tested in this experiment is absorption, which refers to the extent to which a material can absorb sound waves. The correct answer is option a.

By testing how different materials interact with sound waves from the straw horn, the student can gain insight into the properties of those materials and their ability to absorb sound.

A. Wave property: absorption

Method: playing the straw horn in a room with hard surfaces and a room with soft surfaces

To test this property, the student should play the straw horn in a room with hard surfaces, such as walls and floors made of concrete or tile, and a room with soft surfaces, such as walls and floors made of carpet or drapes.

By comparing the sound produced in each room, the student can observe how the sound waves interact with different materials and how effectively each material absorbs the sound.

This method allows the student to investigate how different materials absorb sound waves and how this affects the sound produced by the straw horn. This information can be valuable in understanding how sound travels in different environments and how to optimize sound quality in different settings.

The correct answer is option a.

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A radiation of 2530 amstrong incidents on HI results in decomposition of 1. 85 × 10^-2 mole per 1000 cal of radiant energy. Calculate the quantum efficiency

Answers

The quantum efficiency (QE) of the radiation of 2530 amstrong incidents is approximately 3.47 x [tex]10^8[/tex].

We have,

Quantum efficiency (QE) is a measure of the number of molecules undergoing a specified reaction per photon absorbed.

In this case, you want to calculate the quantum efficiency based on the given data.

Quantum Efficiency (QE) is given by the formula:

QE = (Number of molecules decomposed) / (Number of photons absorbed)

Given:

Number of molecules decomposed = 1.85 × 10^-2 moles

Number of photons absorbed = Energy absorbed / Energy per photon

The energy of a photon (E) is given by Planck's equation:

E = hc / λ

Where:

h = Planck's constant = 6.626 × 10^-34 J·s

c = Speed of light = 3 × 10^8 m/s

λ = Wavelength of radiation = 2530 Å = 2530 × 10^-10 m

Calculate the energy per photon using the wavelength:

E = (6.626 × [tex]10^{-34}[/tex] J·s * 3 × [tex]10^8[/tex] m/s) / (2530 × [tex]10^{-10}[/tex] m)

= 0.007856 x [tex]10^{-34 + 8 + 10[/tex]

= 0.007856 x [tex]10^{-16}[/tex] J

Now, calculate the energy absorbed:

Energy absorbed = 1000 cal = 1000 * 4.184 J (since 1 cal = 4.184 J)

Number of photons absorbed = Energy absorbed / Energy per photon

Calculate the quantum efficiency using the given formula:

QE = (Number of molecules decomposed) / (Number of photons absorbed)

QE = (1.85 × [tex]10^{-2}[/tex] moles) / (Number of photons absorbed)

Substitute the value of the Number of photons absorbed:

QE = (1.85 × [tex]10^{-2}[/tex] moles) / [(1000 * 4.184 J) / (0.007856 x [tex]10^{-16}[/tex] J)]

QE = (1.85 × [tex]10^{-2}[/tex] moles) / (532586.56 x [tex]10^{16}[/tex] J)

QE = 0.000003474 x [tex]10^{14}[/tex]

QE ≈ 3474 × [tex]10^5[/tex]

QE = 3.47 x [tex]10^8[/tex]

Therefore,

The quantum efficiency (QE) is approximately 3.47 x [tex]10^8[/tex].

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10. When the palms of the hands are rubbed together, kinetic energy is changed to ​

Answers

Answer: Friction causes kinetic energy (rubbing your hands together) to convert to heat energy.

Explanation:

Compute the mass of KI needed to prepare 500 mL of a 0. 750 M solution

Answers

The mass of KI needed to prepare 500 mL of a 0. 750 M solution is 62.25 grams

To compute the mass of KI needed to prepare 500 mL of a 0.750 M solution, use the formula:

Molarity (M) = moles of solute / volume of solution in liters

First, convert the volume to liters: 500 mL = 0.5 L

Next, rearrange the formula to find the moles of solute:

moles of solute = Molarity × volume of solution in liters
moles of KI = 0.750 M × 0.5 L
moles of KI = 0.375 moles

Now, find the molar mass of KI (Potassium Iodide):
K (Potassium) = 39.10 g/mol
I (Iodine) = 126.90 g/mol
Molar mass of KI = 39.10 g/mol + 126.90 g/mol = 166.00 g/mol

Finally, calculate the mass of KI needed:

mass of KI = moles of KI × molar mass of KI
mass of KI = 0.375 moles × 166.00 g/mol
mass of KI = 62.25 g

Therefore, you will need 62.25 grams of KI to prepare 500 mL of a 0.750 M solution.

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A 255 liter volume of helium gas is at a pressure of 435 mm of Hg and has a temperature of 299 K. What is the volume of the same gas (in liters) at 655 mm of Hg and 199 K? Again, only enter your numerical answer here; no units! Always follow significant figure rules

Answers

The volume of the same gas is 320 L.

Use the combined gas law to solve for the final volume of the gas:

(P1V1/T1) = (P2V2/T2)

Substituting the given values, we get:

(435 mmHg)(255 L)/(299 K) = (655 mmHg)(V2)/(199 K)

Solving for V2, we get:

V2 = (435 mmHg)(255 L)/(299 K) x (199 K)/(655 mmHg)V2 = 320 L

Therefore, the volume of the gas at the new conditions is 320 L.

The combined gas law relates the pressure, volume, and temperature of a gas in a closed system. It states that the product of pressure and volume divided by the temperature is a constant for a given mass of gas in a closed system undergoing changes in pressure, volume, and temperature. Mathematically, the combined gas law can be represented as:

(P₁V₁)/T₁ = (P₂V₂)/T₂

Where P₁ and V₁ are the initial pressure and volume, T₁ is the initial temperature, P₂ and V₂ are the final pressure and volume, and T₂ is the final temperature. This equation is useful in predicting the behavior of gases when the conditions of pressure, volume, and temperature are changed. The combined gas law is a combination of Boyle's law, Charles's law, and Gay-Lussac's law, and it can be derived from the ideal gas law.

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Draw the correct structure of the indicated product for each reaction. The starting material is a 4 carbon chain where carbon 1 has a bromo substituent and carbon 3 has a methyl substituent. This reacts with K C N to form product 1. Product 1 reacts with hydroxide and water, followed by H 3 O plus to give product 2

Answers

In the first reaction, the starting material (1-bromo-3-methylbutane) reacts with KCN, which acts as a nucleophile.

The cyanide ion (CN-) attacks the carbon with the bromo substituent, leading to a substitution reaction (SN2). As a result, product 1 is formed: 3-methylbutanenitrile.

In the second reaction, product 1 (3-methylbutanenitrile) reacts with hydroxide (OH-) and water (H2O), followed by the addition of H3O+ (hydronium ion).

This involves a two-step process: nucleophilic addition and hydrolysis. The hydroxide ion attacks the nitrile group, creating an intermediate which subsequently undergoes hydrolysis in the presence of H3O+ to form product 2: 3-methylbutanoic acid.

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A large balloon contain 1. 00 mol of helium in a volume of 22. 4 L at 0. 00 C. What pressure will the helium exert on its container?

Answers

The gas laws are a set of fundamental principles that describe the behavior of gases under different conditions of pressure, volume, and temperature. We can use the ideal gas law to solve this problem:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 0.00 C + 273.15 = 273.15 K

Next, we can plug in the values we have:

P(22.4 L) = (1.00 mol)(0.0821 L·atm/mol·K)(273.15 K)

Simplifying:

P = (1.00 mol)(0.0821 L·atm/mol·K)(273.15 K)/(22.4 L)

P = 1.01 atm

Therefore, the helium will exert a pressure of 1.01 atm on its container.

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