Please Help!!
A 25.0-mL sample of H2SO4 is neutralized by 27.4 mL of
1.00M KOH. What is the concentration of the acid?

When sodium phosphate is added to a solution containing 0.0076 M aluminium nitrate and 0.047 M calcium chloride, the concentration of the second ion begins to precipitate is 6.87 x 10⁻⁸ M.

The concentration of this ion when the second ion begins to precipitate is determined by comparing their solubility products (Ksp) and using the ion product (IP) concept.

First, determine which ion will precipitate first by comparing the ion product (IP) to the solubility product (Ksp) for each compound. The ion with the higher IP/Ksp ratio will precipitate first.

IP(AlPO₄) / Ksp(AlPO₄) = [Al₃+][PO4³⁻] / (9.84 x 10⁻²¹)

IP(Ca₃(PO₄)₂) / Ksp(Ca₃(PO₄)₂) = [Ca²⁺]³[PO₄³⁻]² / (2.07 x 10⁻³³)

Since the IP/Ksp ratio for aluminium phosphate is larger than that for calcium phosphate, Al³⁺ will precipitate first as AlPO₄.

Next, find the concentration of Al³⁺ when Ca²⁺ begins to precipitate. At this point, the IP for Ca₃(PO₄)₂ will equal its Ksp.

Ksp(Ca₃(PO₄)₂) = = [Ca²⁺]³[PO₄³⁻]²
2.07 x 10⁻³³ = (0.047)³[PO₄³⁻]²

Solve for PO₄³⁻, then use the IP equation for AlPO₄:

9.84 x 10⁻²¹ = [Al³⁺][PO₄³⁻]

Finally, solve for the concentration of Al³⁺ when Ca²⁺ begins to precipitate. The concentration of Al³⁺ when the second ion (Ca²⁺) begins to precipitate is approximately 6.87 x 10⁻⁸ M.

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The T value of 2-propanol is higher than acetone due to the presence of hydrogen bonding in 2-propanol, which results from its hydroxyl group. This stronger intermolecular force requires more energy to break, leading to a higher boiling point.

The boiling points of acetone and 2-propanol are 56.05°C and 82.6°C, respectively. The T value of 2-propanol is higher than acetone. This difference is caused by the difference in their molecular structures and intermolecular forces.

Acetone is a ketone (CH3COCH3), while 2-propanol is alcohol (CH3CH(OH)CH3). Although both compounds have similar mass values, 2-propanol contains a hydroxyl group (-OH) in its structure, which allows it to form hydrogen bonds with neighboring molecules. Hydrogen bonding is a strong intermolecular force that requires more energy to break and thus, raises the boiling point of the compound.

In contrast, acetone only has a carbonyl group (C=O), and it cannot form hydrogen bonds with itself. It experiences dipole-dipole interactions and London dispersion forces, both of which are weaker intermolecular forces compared to hydrogen bonding.

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The Hoffmann product is the elimination product with the least substitution. Option A is correct.

It is obtained when the elimination reaction occurs via a mechanism that involves a cyclic transition state, leading to an anti-periplanar geometry of the leaving groups. This results in the formation of the least substituted alkene as the major product.

The Hoffmann product is often observed when the leaving group is bulky and cannot adopt a conformation that favors the formation of the more substituted alkene.

An elimination product is a product formed by the elimination of a molecule, often a leaving group, from a larger molecule. Elimination reactions are common in organic chemistry and often involve the removal of a proton and a leaving group from an organic molecule to form a double bond between adjacent carbon atoms.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"The Hoffman product is: select answer from the options below A) the elimination product with the least substitution. B) the elimination product with the highest substitution. C) never the major product of an elimination. D) the elimination product with a bridgehead double bond."--

An example of a secondary pollutant is option (c)- photochemical oxidants.

Secondary pollutants are formed when primary pollutants react with each other or with other substances in the atmosphere. Photochemical oxidants, such as ozone, are created through reactions involving sunlight and primary pollutants like VOCs (volatile organic compounds) and nitrogen oxides.

Hence, an example of a secondary pollutant is option (c)- photochemical oxidants.

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Answer:

1 mole of silver nitrate has a mass = 169.87g

169.87g of silver nitrate corresponds to 1 mole of silver nitrate

Therefore 80.00g of silver nitrate corresponds to:

80.00g silver nitrate divided by 169.87g. = 0.4709 moles of silver nitrate

Answer:

there are approximately 2.3 moles of silver nitrate in 390 g.

Explanation:

To find the number of moles in 390 g of silver nitrate, we first need to determine the molar mass of silver nitrate.

The molar mass of silver nitrate (AgNO3) is:

Ag: 107.87 g/mol

N: 14.01 g/mol

O (3): 15.99 g/mol x 3 = 47.97 g/mol

Total molar mass of AgNO3: 107.87 + 14.01 + 47.97 = 169.85 g/mol

Next, we can use the following formula to calculate the number of moles:

moles = mass (in grams) / molar mass

Plugging in the given values, we get:

moles = 390 g / 169.85 g/mol

moles = 2.296 mol (rounded to three significant figures)

Therefore, there are approximately 2.3 moles of silver nitrate in 390 g.

When heating under reflux, you will need the following glassware equipment to set up the apparatus: Round bottom flask, condenser, hot plate, thermometer, adapter, clamps and stands, water supply.

When heating under reflux, you will need the following glassware equipment to set up the apparatus:

1. Round-bottom flask: This is the flask that contains the reaction mixture that needs to be heated.

2. Condenser: This is a glass tube that is attached to the round-bottom flask and has a water jacket around it. The water is circulated through the jacket to cool down the hot vapours and condense them back into liquid form.

3. Heating mantle or hot plate: This is the equipment that provides heat to the round-bottom flask.

4. Thermometer: This is an instrument used to measure the temperature of the reaction mixture.

5. Adapter: This is a glassware piece that connects the condenser to the round-bottom flask.

6. Clamps and stands: These are used to hold the glassware in place during the heating process.

7. Water supply: This is required to run water through the condenser's jacket to cool down the vapours.

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In the Bohr model of an atom, the true statement about electrons is that they exist at specific energy levels.

This model, proposed by Niels Bohr in 1913, describes electrons as occupying distinct energy levels or shells around the nucleus of an atom. These energy levels are quantized, meaning that electrons can only exist in specific, discrete orbits with fixed energies.

When electrons absorb energy, they can move to a higher energy level or shell, which is called an excited state. Conversely, when they release energy, they return to a lower energy level, known as the ground state. This process is called an electron transition. However, the statement that electrons give off energy as they jump to a higher level is incorrect, as they actually absorb energy when moving to higher energy levels and release energy when returning to lower energy levels.

The statement that electrons cannot move from one orbital to another is also incorrect, as electrons can move between energy levels through the process of absorption or emission of energy, as mentioned above.

Lastly, the claim that electrons are equally close to the nucleus is incorrect. In the Bohr model, electrons in higher energy levels are generally further away from the nucleus than those in lower energy levels. This is because each successive energy level has a larger radius, allowing electrons to be found at various distances from the nucleus depending on their energy level.

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The structural difference between eugenol and acetyleugenol is that eugenol has a hydroxyl group (-OH) at the para position of the benzene ring, while acetyleugenol has an acetyl group (-COCH₃) at the same position. This difference in functional groups allows for their separation by acid-base extraction.

Eugenol and acetyleugenol are initially present in the clove oil. In the first step, the clove oil is mixed with aqueous sodium hydroxide (NaOH) and heated to form a mixture. During this step, eugenol and acetyleugenol dissolve in the aqueous phase. Then, the mixture is cooled, and the aqueous phase containing eugenol and acetyleugenol is separated from the organic phase.

In the second step, hydrochloric acid (HCl) is added to the aqueous phase to lower the pH and cause eugenol to separate out as a solid. Acetyleugenol remains dissolved in the aqueous phase. Finally, eugenol is filtered and recovered as a solid, while acetyleugenol is left behind in the aqueous phase.

The reaction of eugenol with NaOH results in the deprotonation of the hydroxyl group to form the corresponding phenoxide ion. The product obtained is sodium eugenolate, which can further react with other reagents to form various derivatives. The reaction can be represented as; Eugenol + NaOH → Sodium eugenolate + H₂O

where sodium eugenolate is the product obtained.

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The concentrations of Pb₂⁺ and Cr₂⁺ at equilibrium are 0 M and 0.100 M, respectively. The concentration of Cr₃⁺ at equilibrium is 0.200 M.

To determine the concentrations of the different species at equilibrium, we need to write the balanced chemical equation for the reaction between lead metal and chromium(III) ion:

Pb(s) + 2Cr₃⁺(aq) → Pb₂⁺(aq) + 2Cr₂⁺(aq)

We also need to know the initial concentration of chromium(III) ion, which is given as 0.100 M.

Since lead metal is a solid, it does not have a concentration. Instead, its presence affects the equilibrium concentrations of the other species. We assume that the reaction goes to completion, which means that all the chromium(III) ion will react with the lead metal.

At equilibrium, we can use an ICE table to determine the concentrations of the different species:

Initial:              0.100 M         0 M               0 M

Change:        -0.100 M      +0.100 M     +0.200 M

Equilibrium:     0 M             0.100 M        0.200 M

At equilibrium, the concentrations of Pb₂⁺ and Cr₂⁺ are 0 M and 0.100 M, respectively. At equilibrium, the concentration of Cr₃⁺ is 0.200 M.

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Answer:

C) the law of conservation of matter

Explanation:

The law of conservation of matter, also known as the law of conservation of mass, states that matter cannot be created or destroyed in a chemical reaction. This means that the total mass of the reactants in a chemical reaction must be equal to the total mass of the products.

In the context of recycling, this law means that the materials used to make a product can be reused or transformed into new products, rather than being discarded as waste. When materials are recycled, they are not destroyed or eliminated, but rather they are converted into new forms or combined with other materials to create something new. By recycling materials, we are able to reduce the amount of waste that goes into landfills or is incinerated, and we can also conserve natural resources by using fewer raw materials to make new products. Overall, the law of conservation of matter provides a scientific basis for the practice of recycling, and highlights the importance of sustainable resource use and waste reduction.

The molarity of the LiOH solution is 0.075 M.

To calculate the molarity of the LiOH solution, we need to use the equation for neutralization reactions, which states that the number of moles of acid (HNO₃) is equal to the number of moles of base (LiOH). We can calculate the number of moles of HNO₃ from the volume and concentration given:

Moles HNO₃ = concentration x volume = 0.10 M x 28.50 mL = 2.85 x 10⁻³ moles

Since the reaction is 1:1, this also represents the number of moles of LiOH used in the reaction. We can now calculate the molarity of the LiOH solution using the volume of LiOH used:

Moles LiOH = 2.85 x 10⁻³ moles

Volume LiOH = 18.80 mL = 0.01880 L

Molarity LiOH = moles LiOH / volume LiOH

                       = 2.85 x 10⁻³ moles / 0.01880 L

                       = 0.075 M

Therefore, the LiOH solution has a molarity of 0.075 M..

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We need to add 10.90 g of NaOH to the 250 ml sample of 1.09 molarity acetic acid to make the best buffer.

To make the best buffer from a 250 ml sample of 1.09 molarity acetic acid, we need to find out how much NaOH must be added. The Henderson-Hasselbalch equation, which relates the pH of a buffer to its pKa and the ratio of its weak acid to weak base forms.pH = pKa + log([A-]/[HA])In this case, we are dealing with an acetic acid buffer, which has a pKa of 4.76.

We are given a 250 ml sample of 1.09 molarity acetic acid. The molar mass of acetic acid is 60.05 g/mol. Therefore, the number of moles of acetic acid in the sample is:n(acetic acid) = M(acetic acid) x V(acetic acid)n(acetic acid) = 1.09 mol/L x 0.250 Ln(acetic acid) = 0.2725 molNext, we need to find out the amount of NaOH we need to add to make the buffer.

This is a bit tricky because we are given the volume of the acetic acid solution, but not the volume of the final buffer. We also don't know the concentration of the NaOH solution. However, we can use the fact that the buffer is prepared by mixing a weak acid with its conjugate base. Therefore, we can assume that the final buffer will have approximately equal concentrations of acetic acid and acetate ions, which means we need to add an equal amount of NaOH to convert half of the acetic acid to acetate ions.

The balanced chemical equation for the neutralization reaction is:CH3COOH + NaOH → CH3COONa + H2OThe stoichiometry of the reaction is 1:1, which means we need to add an equal number of moles of NaOH to neutralize the acetic acid.n(NaOH) = n(acetic acid) = 0.2725 molNow we need to find out how much NaOH that is in grams.

We can use the molar mass of NaOH to convert from moles to grams.m(NaOH) = n(NaOH) x M(NaOH)m(NaOH) = 0.2725 mol x 40.00 g/molm(NaOH) = 10.90 gTherefore, we need to add 10.90 g of NaOH to the 250 ml sample of 1.09 molarity acetic acid to make the best buffer.

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It is not consumed and speeds up a reaction.

What is Catalyst?

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It works by lowering the activation energy required for the reaction to occur, which allows the reaction to proceed more quickly and with less energy input. Catalysts can be used in a wide range of industrial processes, from the production of chemicals and fuels to the manufacture of pharmaceuticals and food products.

A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. Catalysts work by lowering the activation energy required for a reaction to occur, which allows the reaction to proceed at a faster rate.

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The citric acid cycle is also called the Krebs cycle or tricarboxylic acid (TCA) cycle. In this cycle, a series of chemical reactions that take place in living organisms' cells generate energy through oxidation of acetate derivatives.

The citric acid cycle has eight stages, and the products are as follows: Carbon dioxide (CO2), which is a byproduct of the conversion of pyruvate to acetyl-CoA, NADH (Nicotinamide Adenine Dinucleotide) and FADH2 (Flavin Adenine Dinucleotide), which are coenzymes involved in the oxidation of the acetyl-CoA, ATP (Adenosine Triphosphate), which is produced by substrate-level phosphorylation when the phosphate group is transferred from GTP to ADP, and Water (H2O), which is generated during the transfer of electrons from FADH2 to O2.

The citric acid cycle is an energy-producing cycle in cells that operates through oxidation of acetate derivatives. In this cycle, a series of chemical reactions that take place in living organisms' cells generate energy. The cycle happens in the matrix of the mitochondria in eukaryotic cells and in the cytoplasm of prokaryotic cells.

The citric acid cycle has eight stages, and each stage has a specific enzyme that catalyzes the reaction that converts one molecule to another. The cycle is a central metabolic pathway of aerobic organisms, and it is involved in various metabolic pathways.

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Also, the conversion informs us that one mole at STP contains 22.4 litres of hydrogen. Hence, 2.93 g of aluminium would completely react at stp to form hydrogen gas, or 22.4 * 2.93 = 65.632.

Alkalis and acids both cause aluminium to react. It creates hydrogen gas and aluminium chloride when it interacts with an acid. It creates hydrogen gas and aluminium hydroxide when it interacts with an alkali.

We are aware that one mole of the any petrol takes up 22.4 litres at STP. This implies that at STP, one mole or hydrogen also takes up 22.4 litres of space. Hence, at STP, 10moles or hydrogen gas will take up =22.410=224litres of space.

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Propan-1-ol and ethanoate are esterified Ethanoic acid and propan-1-ol combine to generate an ester. Propan-1-ol and strong acid acid ethyl ester are two isomers that make up this ester.

Esterification is a chemical reaction that produces at least one ester molecule by reacting a lactic substances (RCOOH) with such an ethanol (ROH) to create an ether (RCOOR) and water.

Up to around 1 moldm3, redox reactions are linked to [H+] concentration. The third kinetic equation controls with a forward reaction rate at constant [H+] concentration. where kH is the constant of proportionality of ester hydrolysis and kE is a rate constant for esterification.

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The energy required to melt 5.8 g of ice at 0°C is 1.94 kJ.

What is Energy?

Energy is the capacity of a physical system to do work or produce heat. It is a scalar physical quantity that is often associated with the ability of a system to cause changes in other physical systems or to do work on them. Energy exists in various forms, such as kinetic energy, potential energy, thermal energy, chemical energy, nuclear energy, and electromagnetic energy, and can be transformed from one form to another.

First, we need to calculate the number of moles of ice:

n = m/M

where n is the number of moles, m is the mass of ice, and M is the molar mass of ice.

Molar mass of H2O = 18.015 g/mol

n = 5.8 g / 18.015 g/mol

n = 0.322 mol

Next, we can calculate the energy required to melt the ice using the molar heat of fusion:

q = nΔHf

where q is the energy required, n is the number of moles of ice, and ΔHf is the molar heat of fusion.

ΔHf for ice = 6.02 kJ/mol

q = 0.322 mol x 6.02 kJ/mol

q = 1.94 kJ

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For a weak acid dissociating in water the rates of the forward and reverse reactions will be equal. Option c is the correct choice.

In the context of weak acid dissociation, equilibrium refers to the point where the rate of the forward reaction, which is the dissociation of the acid into its ions, is equal to the rate of the reverse reaction, which is the recombination of the ions to form the original acid molecule.

At equilibrium, there is no net change in the concentration of the acid or its ions. The position of equilibrium, which is determined by the acid's equilibrium constant, depends on the strength of the acid and the conditions of the reaction. Understanding the behavior of weak acids at equilibrium is important in various fields such as biochemistry, environmental science, and industrial processes.

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We can predict that magnesium would not react with KCl solution.

Here are some examples of balanced chemical equations for reactions that might have occurred:

a) Zinc + Hydrochloric acid → Zinc chloride + Hydrogen gas

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

b) Magnesium + Nitric acid → Magnesium nitrate + Hydrogen gas

Mg(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2(g)

c) Copper + Silver nitrate → Copper nitrate + Silver

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)

To list the metals in order of increasing activity based on experimental data, we need to observe and compare their reactivity towards a certain reaction or set of reactions. For example, we can immerse different metals in the same solution and observe which ones react and which ones don't, or we can compare the rate or extent of their reactions.

Assuming that we have data from an experiment involving different metals and a solution or compound, we can rank the metals in order of increasing activity as follows:

copper

Zinc

Magnesium

The order is based on the observation that copper did not react with the solution, while zinc and magnesium did. Zinc reacted faster and more vigorously than magnesium, indicating that it is more active.

Based on the ranking of metals in question 2, we can predict that zinc would react with KCl solution, while magnesium would not. Zinc is more active than magnesium, so it can displace magnesium from its compounds. KCl is a soluble salt, so we can write the balanced chemical equation for the reaction between zinc and KCl as:

Zn(s) + 2KCl(aq) → ZnCl2(aq) + 2K(s)

This reaction releases metallic zinc and forms zinc chloride, while the potassium ions in KCl remain in solution. Magnesium, on the other hand, is less active than zinc, so it cannot displace zinc from its compounds. Therefore, we can predict that magnesium would not react with KCl solution.

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A base is a type of chemical compound that is characterized by the fact that it has a slippery, soapy feel when touched. The correct option is (a).

The slippery, soapy feel is one of the most distinguishing characteristics of a base, and it is due to the fact that bases are able to react with fats and oils on the skin, creating soap-like substances that feel slippery and greasy to the touch.

Bases are also known for their ability to turn red litmus to blue, which is another common characteristic. This is due to the fact that bases are capable of producing hydroxide ions ([tex]OH^{-}[/tex]) when they are dissolved in water.

These hydroxide ions are basic in nature, and they are able to neutralize any acidic substances that they come into contact with. As a result, when blue litmus paper treated with an acidic substance will turn red when it comes into contact with a base.

Acidic substances, on the other hand, produce [tex]H^{+}[/tex] ions when they are dissolved in water. These ions are able to neutralize any basic substances that they come into contact with, and as a result, they will turn litmus paper red.

Overall, bases are a very important class of chemical compounds that are used in a wide range of industrial, scientific, and medical applications.

The complete question is,

which one of the following is characteristic of a base? explain in 200 words.

a. has a slippery, soapy feel

b. produces [tex]H_{3}O[/tex] in water

c. is insoluble in water

d. has a sour taste turns blue litmus red

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Answer:combustion

Explanation:combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.

Answer:

The scientific term used for the chemical reaction when a fuel burns is combustion.

The statement that is incorrect is "0.600 moles of BaF2 is equivalent to 3.61 x 10²³ formula units of BaF₂." The correct statement is that 0.600 moles of BaF2 is equivalent to 3.61 x 1022 formula units of BaF₂.

Mole is a unit used in chemistry to measure the amount of a substance. It is based on the number of atoms or molecules in that substance. One mole of a substance is equal to 6.022 x 10²³ atoms or molecules of that substance. For example, one mole of water molecules is equal to 6.022 x 10²³ water molecules. The mole also helps scientists to measure the mass of a substance. One mole of a substance has a mass in grams equal to the molecular weight of the substance. For example, one mole of water molecules has a mass of 18.015 grams, which is the molecular weight of water.

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Explanation:

V(CO) = 50 cm^3 = 50 ml = 0.05 l

V(air) = 150 cm^3 = 150 ml = 0.15 l

V(O2)/V(air) = 20%

_____________________________

2 CO + O2 = 2CO2

n(CO) = V(CO)/V(M) = 0.05/22.4 = 0.0022mol

V(O2)/V(air) = x/150 x=150×0.2 =30 ml=0.03l

n(O2) = V(O2)/V(M) =0.03/22.4 = 0.0013 mol

From the reaction ratio n(CO): n(O2) = 2:1

For explosing 0.0022 mol CO need 0.0011 mol O2. We have 0.0013 mol O2, then , 0.0003 mol O2 is excess.

Answer: O2 was in excess

Answer: the one thats not there because you didnt put any pictures

A brief explanation of bilateral, radial, and asymmetric can be found below.

Bilateral, radial, and asymmetric are terms used in zoology to describe the symmetry of an animal's body.

Bilateral symmetry refers to an animal's body being divided into two equal and opposite halves along a central axis. This type of symmetry is common in animals with a distinct head and tail end, such as humans.

Radial symmetry refers to an animal's body being arranged in a circular or radial pattern around a central axis. This type of symmetry is common in animals such as jellyfish, where the body parts are arranged around a central mouth.

Asymmetric refers to an animal that lacks any kind of symmetry. This type of body plan is uncommon in animals, but is seen in some types of sponges and other primitive organisms.

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D) is reaction 1 exothermic under standard conditions?  "no, because the standard enthalpy change is negative. "

When a reaction is exothermic, it releases heat as it proceeds. In this case, the given question is asking if Reaction 1 is exothermic under standard conditions.

The answer is no, because the standard enthalpy change is negative.A negative standard enthalpy change means that the reaction is endothermic, not exothermic. Endothermic reactions absorb heat from the surroundings as they proceed. Therefore, heat is not released and added to the system,

which rules out option a). The percent yield of NH₃ being greatest at high pressure, as stated in option c), is not relevant to whether the reaction is exothermic or endothermic.

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The volume, in l, of 10.0 m hcl needed to make 2.00 l of 2.00 m hcl solution by dilution with water is 0.400 L. The correct answer is option b (0.400 L).

To make a 2.00 M HCl solution by diluting 10.0 M HCl, we can use the formula:

M1V1 = M2V2 ,where M1 is the initial concentration (10.0 M), V1 is the initial volume (unknown), M2 is the final concentration (2.00 M), and V2 is the final volume (2.00 L).

Rearranging this equation to solve for V1, we get:

V1 = (M2V2) / M1

Plugging in the values, we get:

V1 = (2.00 M x 2.00 L) / 10.0 M

V1 = 0.400 L

Therefore, the volume of 10.0 M HCl needed to make 2.00 L of 2.00 M HCl solution by dilution with water is 0.400 L.

Dilution is defined as the process of adding more solvent to a solution. When diluting a solution, the concentration of the solute is reduced. It's important to note that when diluting a solution, the number of moles of the solute remains the same.

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Answer:  The purpose of phenolphthalein indicator is to show pink color if the liquid in the flask is titration fully.

Explanation:

The purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration is to serve as an indicator for the endpoint of the titration.

What is titration?

Titration is a laboratory technique used to determine the concentration of a solution of a known volume by reacting it with a solution of known concentration or strength. A titration is a controlled chemical reaction that is conducted by slowly adding one solution to another until the chemical reaction is complete.

Phenolphthalein- Phenolphthalein is a commonly used indicator in acid-base titrations. The color of phenolphthalein changes depending on the pH of the solution being titrated. Phenolphthalein is pink in the presence of a base and colorless in the presence of an acid.

The purpose of adding phenolphthalein to the Erlenmeyer flask before starting a titration is to serve as an indicator for the endpoint of the titration. The endpoint of a titration is the point at which the reaction is complete.

When the reaction is complete, the color of the solution will change from pink to colorless, indicating that the solution has reached the endpoint of the titration.

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The ultimate BOD (BODu) is the BOD remaining after a long period of incubation (usually 20 days). The BOD of a waste can be modelled using the following equation:

BODt = BODu ( 1 - e^(-kt) )

where BODt is the BOD at time t, BODu is the ultimate BOD, k is the rate constant, and e is the base of the natural logarithm.

We can use the given k values and BOD5 to solve for the ultimate BOD for each waste.

For waste 1 (k = 0.0800 d^-1):

BOD5 = BODu ( 1 - e^(-k5) )

280.0 ml/L = BODu ( 1 - e^(-0.08005) )

280.0 ml/L = BODu ( 1 - e^(-0.4) )

280.0 ml/L = BODu ( 0.3297 )

BODu = 851.4 ml/L

Therefore, the ultimate BOD for waste 1 is 851.4 ml/L.

For waste 2 (k = 0.1200 d^-1):

BOD5 = BODu ( 1 - e^(-k5) )

280.0 ml/L = BODu ( 1 - e^(-0.12005) )

280.0 ml/L = BODu ( 1 - e^(-0.6) )

280.0 ml/L = BODu ( 0.4457 )

BODu = 628.4 ml/L

Therefore, the ultimate BOD for waste 2 is 628.4 ml/L.

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Ammonium hydroxide is a weak base because c. it dissociates only slightly in water.

When dissolved in water, ammonium hydroxide donates a proton to form the ammonium ion and hydroxide ion. However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base. In chemistry, a substance is referred to as a base if it has the ability to accept protons (H+ ions).

Ammonium hydroxide is a weak base because, when dissolved in water, it donates a proton to form the ammonium ion (NH4+) and hydroxide ion (OH−). This reaction is reversible, as represented by the chemical equation below: NH4+ (aq) + OH− (aq) ⇌ NH3 (aq) + H2O (l)However, this reaction is only partially reversible because the ammonium ion is not a strong enough acid to accept a proton and regenerate the ammonium hydroxide. Therefore, the hydroxide ion concentration in the solution is relatively low, making it a weak base.

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