Answer:
Explanation:
We can use to convert the given number of atoms of nickel to moles.
1 mole of any element contains 6.022 x 10^23 atoms of the element
So, the number of moles of nickel can be calculated as:
moles of Ni = (number of atoms
moles of Ni = 3.88 x 10^23 / 6.022 x 10^23
moles of Ni = 0.644
Therefore, the answer is option B: 0.644 moles Ni.
How many moles of potassium chloride form when 3 moles of potassium hydroxide react completely.
The balanced chemical equation for the reaction between potassium hydroxide (KOH) and potassium chloride (KCl) is:
KOH + HCl → KCl + H2O
From the equation,it can be seen that for every one mole of potassium hydroxide that reacts, one mole of potassium chloride is produced.
Therefore, if 3 moles of potassium hydroxide react completely, then 3 moles of potassium chloride will be produced. This is because the mole ratio of potassium hydroxide to potassium chloride is 1:1.
Thus, the answer is 3 moles of potassium chloride.
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How many milliliters of an aqueous solution of 0.124 M silver fluoride is needed to obtain 17.8 grams of the salt? mL
We need 117.76 mL volume of the aqueous solution of 0.124 M silver fluoride to obtain 17.8 grams of the salt.
What is volume?
To solve this problem, we can use the formula:
mass = molarity x volume x molar mass
where mass is the mass of the solute (in grams), molarity is the concentration of the solution (in moles per liter), volume is the volume of the solution (in liters), and molar mass is the mass of one mole of the solute (in grams per mole).
First, we need to calculate the molar mass of silver fluoride (AgF):
AgF = 1 x 107.87 + 1 x 18.998 = 126.868 g/mol
Next, we can rearrange the formula above to solve for volume:
volume = mass / (molarity x molar mass)
Substituting the given values:
volume = 17.8 g / (0.124 mol/L x 126.868 g/mol)
volume = 117.76 mL
Therefore, we need 117.76 mL of the aqueous solution of 0.124 M silver fluoride to obtain 17.8 grams of the salt.
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Complete question is: 117.76 milliliters of an aqueous solution of 0.124 M silver fluoride is needed to obtain 17.8 grams of the salt.
A certain experiment generates hydrogen gas, which is collected over water. The temperature is 283 K and the atmospheric pressure is 0.97 atm. What is the partial pressure of H2?
Answer:
partial pressure of H2 = 0.9574 atm OR 727.6 mmHg
Explanation:
in case of collection of gas over water:
[tex]P_{atm} = P_{vapor} + P{gas}[/tex]
[tex]P_{atm}[/tex]: atmospheric pressure
[tex]P_{vapor}[/tex]: pressure of water vapor (must be given in the question!)
[tex]P_{gas}[/tex]: pressure of gas
in this question:
water vapor pressure at 283K (10°C) = 9.6 mmHg (again, this must be given in the question)
Given: [tex]P_{atm}[/tex] = 0.97 atm = 737.2 mmHg
by substitution in the formula:
737.2 = 9.6 + [tex]P_{H_2}[/tex]
[tex]P_{H_2}[/tex] = 727.6 mmHg = 0.9574 atm
Use the example to answer the question. In South Carolina, there is an area of shoreline called Grand Strand. Its central part is not protected by barrier islands.
Which of the following could you infer about the impact of water movement on this area? (1 point) Responses
Water movement has caused longshore currents to erode the sediment from one end of this shoreline.
Water movement has caused longshore currents to erode the sediment from one end of this shoreline.
Water movement has caused a build up of various inlets to form a combination of tides and currents.
Water movement has caused a build up of various inlets to form a combination of tides and currents.
Water movement has caused this land to erode because there is no protection from strong waves.
Water movement has caused this land to erode because there is no protection from strong waves. Water movement has caused strong waves to build the shoreline up through the process of deposition.
Water movement has caused this land to erode because there is no protection from strong waves.
Grand Strand's central part is not protected by barrier island, meaning it is more exposed to the water movement, which can cause strong waves to erode the land. This erosive action leads to the shoreline being worn away, or having sediment removed from it.The movement of water is an important natural process that is necessary for the health and stability of our environment. It is responsible for the circulation of water between the atmosphere, land, and ocean, and for the transport of energy, nutrients, and organic matter.
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complete question:Use the example to answer the question. In South Carolina, there is an area of shoreline called Grand Strand. Its central part is not protected by barrier islands.
Which of the following could you infer about the impact of water movement on this area? (1 point) Responses
a.Water movement has caused longshore currents to erode the sediment from one end of this shoreline.
b.Water movement has caused a build up of various inlets to form a combination of tides and currents.
c.Water movement has caused this land to erode because there is no protection from strong waves.
d.Water movement has caused strong waves to build the shoreline up through the process of deposition.
Fluoride, a very stable form of fluorine, is often added to toothpaste and drinking water to prevent
tooth decay. What is the formula of this species?
a. F
b. Fl-
C. Fl+
d. F²-
when 23ml of 0.100 m agno3 is combined with 27ml ml of 0.1000 m hcl in a coffe-cup calorimeter the temperature changes from 23.81 to 24.62 celcius calculate change in enthalkpy
The change in enthalpy for the reaction is -7.57 × 10^4 J/mol. This negative value indicates that the reaction is exothermic, meaning it releases heat to the surroundings.
To calculate the change in enthalpy, we need to use the equation:
ΔH = -q / n
where ΔH is the change in enthalpy, q is the heat absorbed or released by the reaction, and n is the number of moles of limiting reactant.
First, we need to determine the limiting reactant. This can be done by comparing the number of moles of each reactant:
moles of AgNO3 = (23 mL) x (0.100 mol/L) = 0.0023 mol
moles of HCl = (27 mL) x (0.1000 mol/L) = 0.0027 mol
Since AgNO3 has a smaller number of moles, it is the limiting reactant.
Next, we need to calculate the heat absorbed or released by the reaction. We can do this using the equation:
q = m × c × ΔT
where q is the heat absorbed or released, m is the mass of the solution, c is the specific heat capacity of the solution, and ΔT is the temperature change.
Assuming the specific heat capacity of the solution is 4.18 J/(g·K) and the density of the solution is 1.00 g/mL, we can calculate the mass of the solution:
mass of solution = (23 mL + 27 mL) × (1.00 g/mL) = 50 g
Substituting the values, we get:
q = (50 g) × (4.18 J/(g·K)) × (24.62°C - 23.81°C) = 174.5 J
Finally, we can calculate the change in enthalpy using the equation:
ΔH = -q / n
ΔH = -(174.5 J) / (0.0023 mol) = -7.57 × 10^4 J/mol
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If 6.25 g of CuNO3 is dissolved in water to make a 0.840 M solution, what is the volume of the solution in milliliters?
The volume of the solution is 39.6 mL. Solutions can be formed by dissolving solids, liquids, or gases in a liquid solvent or by dissolving gases in a solid solvent.
What is Solution?
A solution is a homogeneous mixture of two or more substances in which the components are uniformly distributed on a molecular or ionic level. In a solution, the substance that is present in the largest amount is called the solvent, and the substance that is present in smaller amounts is called the solute.
We can use the following formula to calculate the volume of the solution:
Molarity (M) = moles of solute (n) / volume of solution in liters (V)
First, we need to calculate the number of moles of Cu(NO3)2:
mass of Cu(NO3)2 = 6.25 g
molar mass of Cu(NO3)2 = 187.56 g/mol (63.55 g/mol for Cu + 2x14.01 g/mol for N + 6x16.00 g/mol for O)
moles of Cu(NO3)2 = mass / molar mass = 6.25 g / 187.56 g/mol = 0.0333 mol
Next, we can rearrange the formula to solve for the volume of the solution:
V = n / M
V = 0.0333 mol / 0.840 M = 0.0396 L
Finally, we convert the volume to milliliters:
V = 0.0396 L x 1000 mL/L = 39.6 mL
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Calculate ΔHrxn for the following reaction: Al2O3(s)+3CO(g)→2Al(s)+3CO2(g) Use the following reactions and given ΔH values: 2Al(s)+32O2(g)→Al2O3(s),ΔH CO(g)+12O2(g)→CO2(g),ΔH==−1675.7kJ−282.7kJ
The desired reaction is 2Al(s) + 3CO2 from Al2O3(s) + 3CO(g) (g) The reactions include 2 Al(s), 3/2 O2(g), and Al2O3(s), with H = 1675.7kJ. ————————— (1) CO(g) = CO2 + 1/2 O2(g) (g).
How is H inside a calculated?As a result, the enthalpies of a reactants and products are added together, and the result is used to compute the enthalpy of a reaction. This endothermic process generates and absorbs environmental heat if H is positive. This reaction is exothermic so emits heat into the environment if H is negative.
What is the H heat?A negative H indicates that heat is transferred from the a system towards its surroundings, whereas a positive H indicates that heat is transferred from the surroundings into the system. An enthalpy of reaction (Hrxn) for a chemical reaction is the difference of enthalpy between the products and reactants; Hrxn is measured in kilojoules per mole.
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A student dissolves 0.03450 mol of solid salt in 49.83 g of distilled water and observes the temperature of the water rise from 25.2˚C to a final temperature of 31.4˚C. If the calorimeter constant is 37.4 J/˚C, what is the calculated enthalpy of the reaction of the salt in units of kJ/mol? Explain how you would go about solving the problem and show all work for each step in your solution.
The calculated enthalpy of the reaction of the salt is 44.064 kJ/mol.
To solve this problem, we can use the formula:
q = m x c x ∆T
where q is the heat absorbed or released, m is the mass of the solution, c is the specific heat capacity of water (4.184 J/g ˚C), and ∆T is the change in temperature. We can then use the heat absorbed to calculate the enthalpy change of the reaction using the formula:
∆H = q / n
where n is the number of moles of the salt.
First, let's calculate the mass of the water:
m = 49.83 g
Next, let's calculate the change in temperature:
∆T = 31.4˚C - 25.2˚C = 6.2˚C
Now, let's calculate the heat absorbed by the water:
q = m x c x ∆T
q = 49.83 g x 4.184 J/g ˚C x 6.2˚C
q = 1304.4 J
Since the calorimeter constant is given as 37.4 J/˚C, we need to adjust for the heat absorbed by the calorimeter:
q' = q + (calorimeter constant x ∆T)
q' = 1304.4 J + (37.4 J/˚C x 6.2˚C)
q' = 1519.88 J
Next, let's calculate the number of moles of the salt:
n = 0.03450 mol
Finally, let's calculate the enthalpy change of the reaction:
∆H = q' / n
∆H = 1519.88 J / 0.03450 mol
∆H = 44,064 J/mol
To convert the answer to kJ/mol, we divide by 1000:
∆H = 44.064 kJ/mol
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After bubbling some sulfur dioxide into potassium permanganate solution (containing KOH), manganese dioxide (1.74 g) was formed. Calculate mass of KOH spent for the reaction.
The reaction between sulfur dioxide and potassium permanganate in the presence of KOH produces manganese dioxide. Using stoichiometry and the given mass of manganese dioxide (1.74 g), the mass of KOH can be calculated to be 3.16 g.
What are some of the practical applications of potassium permanganate?Potassium permanganate is widely used as a disinfectant and oxidizing agent in various industries. It is also used in water treatment, as a laboratory reagent, and in the manufacture of chemical compounds.
What is the mechanism of the reaction between sulfur dioxide and potassium permanganate in the presence of KOH?In the presence of KOH, sulfur dioxide reduces permanganate ions to manganese dioxide. This reaction proceeds through a series of intermediate steps involving the formation of manganese(IV) oxide and manganese(III) oxide.
This reaction's precise mechanism is intricate and requires numerous phases.
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Which equation would you need to rearrange to calculate the specific heat of an object?
Responses
A. ΔS=QT
delta S equals Q over T,
B. ΔU=Q+W
delta U equals Q plus W,
C. Q=mΔHf
Q equals m delta H subscript f,
D. Q=mCΔT
The answer will be option A.
Define thing or objectThings and objects are essentially different types of entities ontologically,Contrary to popular belief, merging specifics does not make an item identical.
Things have evolved.elements but not things. But objects are not onto logically harmless, whereas things are.anything is when moving.It is claimed to be moving.
An incoming jet, a leaf rustling in the breeze, or fluid trickling from such a hose could all be the source of the noise. Even the school you attend is connected to the planet Earth.
The formula for determining a substance's specific heat capacity is [tex]C= \frac{Q}{mT}[/tex]. [tex]Q[/tex] represents the energy [tex]T[/tex] stands for temperature shift and addition.
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A pure copper cube has an edge length of 3.00 cm
How many copper atoms does it contain? (volume of a cube = (edge length)^3
; density of copper = 8.96 g/cm^3)
Since this equals (edge length)3, the cube's volume is 3 * 1.12 cm, or 3.36 cm3. As a result, the cube has 3.36/8.96 g/cm3 = 0.43 grammes of copper atoms.
What is the perimeter of a volumetric cube?V= s3, where s is the length of one of the cube's edges, is the formula for a cube's volume. The length of the edge is equal to the volume's cube root, or 4 cm, if the volume is 64.
How do I figure out the atom count?To get the number of moles in an element or compound, divide the supplied mass by the element or compound's molar mass.
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How many atoms of boron are present in 2.29 moles of boron trifluoride?
2.29 moles of boron trifluoride contain 1.38 10²⁴ atoms of boron.
The amount of atoms in boron trifluoride.One boron atom and three fluorine atoms make up the trigonal planar molecule known as boron trifluoride.
The atomic masses of boron (B) and fluorine (F), which are 10.81 g/mol and 18.99 g/mol respectively, may be added to determine the molar mass of boron trifluoride (BF3).
Molar mass of BF3 = (1 × molar mass of B) + (3 × molar mass of F)
Molar mass of BF3 = (1 × 10.81 g/mol) + (3 × 18.99 g/mol)
Molar mass of BF3 = 67.81 g/mol
Now we can calculate the number of moles of BF3 using its given mass:
Mass of BF3 / molar mass of BF3 equals moles of BF3.
moles of BF3 = 2.29 moles
1 mole of BF3 contains 1 mole of B
1 mole of B contains Avogadro's number (6.02 × 10²³) atoms of B
Therefore, the number of atoms of boron in 2.29 moles of BF3 is:
2.29 moles of BF3 x (1 mole of B / 1 mole of BF3) x (6.02 × 10²³ atoms of B / 1 mole of B) = 1.38 × 10²⁴ atoms of B.
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A solution of rubbing alcohol is 76.4% (v/v) isopropanol in water. How many milliliters of isopropanol are in a 89.6 mL sample of the rubbing alcohol solution?
The total volume of the solution is 89.6 milliliters. The percentage of isopropanol is 76.4% (v/v), so 76.4% of the total volume is isopropanol.
What is an isopropanol?Isopropanol, also known as isopropyl alcohol, is a colorless, flammable liquid with a strong odor. Isopropanol is the simplest example of a secondary alcohol, and is frequently used as a cleaning agent and disinfectant in many industries. It is also used in the production of acetone.
What is rubbing alcohol?Rubbing alcohol, which is also known as isopropyl alcohol, is a clear liquid chemical compound. It is used as a topical antiseptic because it has a strong disinfectant and antibacterial action. Rubbing alcohol is also used as an fuel additive in automobiles, as a cleaning solvent in industry, and as a solvent in chemical reactions. Additionally, it can be used as a disinfectant for medical and cosmetic purposes, including cleansing wounds and preventing infection.
To calculate the amount of isopropanol, we must multiply 89.6 milliliters by 76.4%. 89.6 milliliters x 0.764 = 68.6064 milliliters of isopropanol Therefore, there are 68.6064 milliliters of isopropanol in a 89.6 mL sample of the rubbing alcohol solution.
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Create a “Chemical Reaction Poster” that will summarize key concepts about chemical reaction. In your poster, include
Definition of chemical reaction and balanced equation
Steps in balancing chemical equation and an example
Types of chemical reaction and an example for each
Picture/images related to chemical reaction
Other related information
Rubric:
Content ……………………25 points
Organization ……….… 25 points
Neatness/Creativity... 15 points
please help so it can bring my grade up
thank you soo much
A wire has a conductivity of 0.15 mho because because a chemical reaction is a procedure that causes one group of chemical components to change into another.
What is the crucial idea behind chemical reactions?The total mass of the reactants and products are equal in all chemical reactions. The total number and kinds of atoms in the reactants and the total number and kinds of atoms in the products are equal in all chemical reactions.
What does a student's account of a chemical reaction entail?Breaking chemical bonds between reactant molecules (particles) and creating new bonds between atoms in product particles are two aspects of chemical reactions (molecules). While there are the same number of atoms both before and after the chemical transition, there will be a change in the number of molecules.
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If water is added to a base, which describes how the pH of the solution will change?
A. increase
B. decrease
C. no change
D. increase then decrease
E. decrease then increase
Answer: the pH would decrease
Explanation:
bases are alkaline which means that thir pH would in the category between 14 and 8
Water is neutral which meand that it's pH is at 7
so if you add water to a base then the concentration the pH would eventually decrease towards a 7
hope it helps✨✨
During the phase change when ice melts at 0°C, the kinetic energy of the molecules
A) decreases.
B) remains the same.
C) can't be determined without a heating curve.
D) increases.
Answer:
B
Explanation:
When ice melts at 0oC, average kinetic energy of the molecules will remain the same.
During the 1986 accident in Chernobyl nuclear power plant located in the former Soviet
Union, radioactive strontium was released into the environment. There was a concern that
if strontium were ingested, then this radioactive nuclide would be incorporated into parts
of the body where large amounts of Ca are deposited in the workers' bodies such as in the
bones and the teeth. Based upon of the positions of Sr and Ca in the periodic table, explain
the logic of this concern.
In the periodic table, strontium (Sr) and calcium (Ca) both belong to Group 2A, sometimes referred to as the alkaline earth metals.
What impact did the Chernobyl disaster have on the natural world?After the disaster, radioactive substances were primarily spread by contaminated rain on open surfaces like lawns, parks, roadways, and building roofs. Due to the effects of wind, rain, traffic, street washing, and cleanup since then, there is less surface contamination in metropolitan areas.
What natural factors led to the explosion at the Chernobyl power plant?At least 5% of the radioactive reactor core was discharged into the atmosphere following the steam explosion and fires.
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Determine the mass in grams of 3.07 moles of glucose (C6H12O6)
Mass in grams of 3.07 moles of glucose is 553.3 g (rounded to three significant figures).
What is Mass?
Mass is a fundamental physical property of matter that quantifies the amount of matter in an object. It is a measure of the resistance of an object to acceleration when a force is applied to it. In other words, mass is the amount of substance in an object, and it determines how much gravity will affect that object.
To determine the mass in grams of 3.07 moles of glucose (C6H12O6), we need to first calculate the molar mass of glucose, which is the sum of the atomic masses of all the atoms in its chemical formula:
Molar mass of C6H12O6 = 6(12.01 g/mol) + 12(1.01 g/mol) + 6(16.00 g/mol) = 180.18 g/mol
Next, we can use the following conversion factor to convert moles to grams:
mass (g) = number of moles x molar mass (g/mol)
mass = 3.07 mol x 180.18 g/mol = 553.3 g
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a) Develop an awareness campaign using the stages of change model to sensitize expectant mothers on the dangers of alcoholism.
b) What are the likely obstacles to implementation of this programme
c) Suggest your role as a public health officer in promotion of health behaviors
Programs on substance abuse are run in schools, colleges, businesses, and communities. These program are aimed at reducing drug and alcohol usage while addicts and dependents to seek treatment.
How knowledgeable are you about the harmful effects of alcohol abuse?long-term health risks. Heavy alcohol use might eventually lead to the onset of serious conditions like high blood pressure, heart disease, strokes, liver problems, and digestive problems. cancers of the breast, oesophagus, mouth, throat, liver, and rectum.
What is the goal of alcohol education?Campaigns to raise awareness are designed to: stop young individuals from consuming alcohol before they reach 18. preventing drinking that is unhealthy. preventing alcoholism-related psychological or physical dependence.
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Which of the following is true for the quantum mechanical atomic model?
A. Atoms absorb or emit electrons from the nucleus when they interact with electromagnetic radiation.
B. Every atom absorbs all wavelengths of light energy or electromagnetic radiation.
C. Electrons give off electromagnetic radiation when they jump from a high to a low energy level.
D. Electrons are perfectly evenly distributed throughout the atom.
The true statement for the quantum mechanical atomic model is that Electrons give off electromagnetic radiation when they jump from a high to a low energy level.
Option c is correct.
What is e quantum mechanical atomic model?The quantum mechanical atomic model, also known as the wave mechanical model, describes the behavior of electrons in atoms as waves.
This model described that only electrons can exist only in certain discrete energy levels around the nucleus. When an electron absorbs energy, it moves to a higher energy level.
In other words, when it loses energy, it moves to a lower energy level.
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Chemistry Help!
1. Copper is commonly used to make electrical wires. How many moles of copper are in 5.00 grams of copper wire?
2. Our bodies synthesize protein from amino acids. One of these amino acids is glycine, which has a molecular formula of C2H5O2N. How many moles of glycine molecules are contained in 28.35 grams of glycine?
3. Vitamin C is a covalent compound with the formula of C6H8O6. The recommended daily dietary allowance of vitamin C for children aged 4-8 years is 1.42 x 10-4 mol.
a. What is the mass of this allowance in grams?
b. How many moles of carbon are in 1.42 x 10-4 mol of C6H8O6?
4. Rank the following from lowest number of particles to highest. Explain your reasoning.
2.3 mol H2O 3.5 mol H2 0.50 mol C100H202
Answer:
1. The molar mass of copper is 63.55 g/mol. To find the number of moles of copper in 5.00 grams, we divide the given mass by the molar mass:
5.00 g Cu / (63.55 g/mol Cu) = 0.0787 mol Cu
Therefore, there are 0.0787 moles of copper in 5.00 grams of copper wire.
2. The molar mass of glycine (C2H5O2N) is:
12.01 g/mol (C) + 1.01 g/mol (H) x 5 + 16.00 g/mol (O) x 2 + 14.01 g/mol (N) = 75.07 g/mol
To find the number of moles of glycine in 28.35 grams, we divide the given mass by the molar mass:
28.35 g glycine / (75.07 g/mol glycine) = 0.377 mol glycine
Therefore, there are 0.377 moles of glycine molecules in 28.35 grams of glycine.
3. a. To find the mass of 1.42 x 10^-4 mol of vitamin C, we multiply the molar mass of vitamin C (176.12 g/mol) by the number of moles:
1.42 x 10^-4 mol x 176.12 g/mol = 0.0248 g
Therefore, the mass of the recommended daily dietary allowance of vitamin C for children aged 4-8 years is 0.0248 grams.
b. The molecular formula of vitamin C is C6H8O6, so there are 6 moles of carbon for every mole of vitamin C. Therefore, there are:
1.42 x 10^-4 mol x 6 = 8.52 x 10^-4 mol of carbon
in 1.42 x 10^-4 mol of C6H8O6.
4. To rank the following from lowest number of particles to highest, we need to compare the number of particles in each of the given amounts.
2.3 mol H2O: 2.3 mol x 6.022 x 10^23 molecules/mol = 1.39 x 10^24 molecules of H2O
3.5 mol H2: 3.5 mol x 6.022 x 10^23 molecules/mol = 2.11 x 10^24 molecules of H2
0.50 mol C100H202: 0.50 mol x 6.022 x 10^23 molecules/mol = 3.01 x 10^23 molecules of C100H202
Therefore, the ranking from lowest to highest number of particles is:
0.50 mol C100H202 < 2.3 mol H2O < 3.5 mol H2.
The reasoning is based on the Avogadro's number which represents the number of particles in one mole of a substance, which is equal to 6.022 x 10^23. The substance with the smallest number of moles has the smallest number of particles, and the substance with the largest number of moles has the largest number of particles.
3 Cu + 8HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation, how many grams of water can be made when 6.3 moles of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16
3 Cu + 8HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2O
n(HNO3)=6.3mol
unknown/known=4/8=1/2
n(H2O)=n(HNO3)/2=3.15mol
m(H2O)=nxM=3.15x(1+1+16)=56.7g
Let me know if its wrong
whoever answers all these questions gets brainliest and 35 points please help you don't have to explain it I just need answers this thing is extremely overdue.
Physical change example: Melting of ice: When ice melts, it undergoes a physical change as its state changes from solid to liquid. The chemical composition of water molecules remains the same.
Chemical change example: Burning of wood: When wood burns, it undergoes a chemical change as it reacts with oxygen in the air to produce carbon dioxide, water vapor, and ash. The chemical composition of the wood changes during the burning process.
How to explain the questionsSport example: Basketball - Friction, gravity, and inertia affect the movement of the ball and the players during the game. Friction between the ball and the court surface allows players to dribble the ball and make cuts and stops.
Gravity affects the arc of the ball when it's shot and how high it bounces. Inertia affects the movement of players when they run, jump, or change directions.
Electromagnetic energy in order of longest to shortest wavelength: Radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.
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Cite one specific example each of a physical change and a chemical change.
Choose a sport, and then describe how friction, gravity, and inertia affect the action.
List these forms of electromagnetic energy in order from longest to shortest wavelength:
Find the volume to liters of each of the following A. 11. 2L H2
a. The volume of 8.00 g of O2 at STP is 5.90 L.
b. The volume of 3.50 g of CO at STP is 2.95 L.
c. The volume of 0.0170 g of H2S at STP is 11.0 mL.
d. The volume of 2.25 x 10^5 kg of NH3 at STP is 302.7 m3.
How do we calculate?a.
PV = nRT
n = m/MW
n = 8.00 g / 32 g/mol = 0.25 mol
V = nRT/P
V = (0.25 mol) (0.0821 L atm/(mol K)) (273 K) / (1 atm)
V = 5.90 L
b.
n = m/MW
n = 3.50 g / 28 g/mol = 0.125 mol
solve for V:
V = nRT/P
V = (0.125 mol) (0.0821 L atm/(mol K)) (273 K) / (1 atm)
V = 2.95 L
the volume of 3.50 g of CO at STP is 2.95 L.
c.
n = m/MW
n = 0.0170 g / 34 g/mol = 0.0005 mol
solving for V:
V = nRT/P
V = (0.0005 mol) (0.0821 L atm/(mol K)) (273 K) / (1 atm)
V = 0.011 L or 11.0 mL
The volume of 0.0170 g of H2S at STP is 11.0 mL.
d.
n = m/MW
n = 2.25 x 10^5 kg / 17 g/mol / 1000 g/kg = 13,235 mol
V = nRT/P
V = (13,235 mol) (0.0821 L atm/(mol K)) (273 K) / (1 atm)
V = 302,720 L or 302.7 m3
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distinguish between equivalent and non-equivalent protons
Protons are the positively charged particles found in the nucleus of an atom. In terms of their magnetic properties, protons can be classified into two categories: equivalent and non-equivalent protons.
Equivalent protons are protons that have the same chemical environment in a molecule. This means that they experience the same local electronic and magnetic environment, and as a result, they produce the same NMR signal. For example, in a molecule of ethyl alcohol (CH3CH2OH), the two methyl (CH3) groups are equivalent because they are attached to the same carbon and are surrounded by the same atoms.
Non-equivalent protons, on the other hand, are protons that have different chemical environments in a molecule. This means that they experience different local electronic and magnetic environments, and as a result, they produce different NMR signals. For example, in a molecule of acetone (CH3COCH3), the three methyl (CH3) groups are non-equivalent because they are attached to different carbons and are surrounded by different atoms.
The distinction between equivalent and non-equivalent protons is important in NMR spectroscopy, as it allows chemists to distinguish between different types of protons in a molecule and determine their relative abundance and position in the molecule.
draw a picture at the molecular level showing the london dispersion force between two helium atoms. use the text box to explain what is causing the attraction between the atoms.
London dispersion forces arise due to the motion of electrons and the resulting temporary asymmetry in the electron cloud, leading to the attraction between atoms or molecules.
London dispersion forces are the weakest intermolecular forces that exist between all atoms and molecules. They arise due to the temporary asymmetry of the electron cloud surrounding an atom or molecule. The resulting temporary dipole moment induces an opposite dipole in a neighboring atom or molecule, which leads to the attraction between them.
In the case of two helium atoms, the electron clouds of both atoms are symmetrical in the absence of any external influence. However, due to the constant motion of electrons, there may be a temporary imbalance in the electron distribution of one helium atom, resulting in a temporary dipole moment. This dipole moment can induce a dipole moment in the neighboring helium atom, leading to the attraction between them.
At the molecular level, this attraction is depicted by a temporary shift of electrons towards one helium atom, creating a partial negative charge, and a corresponding shift away from the other helium atom, creating a partial positive charge. The partially negative helium atom is attracted to the partially positive helium atom of the neighboring molecule, resulting in the formation of a weak London dispersion force between the two helium atoms.
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Exchange of waste material, oxygen, carbon dioxide, and
metabolites such as salts and food molecules takes place in the
a. capillaries.
b. venules.
c. arterioles.
d. arteries.
The right answer is capillaries that metabolites like salts and food molecules are exchanged in capillaries together with waste products, oxygen, and carbon dioxide.
Where does the exchange of food and garbage take place?In the capillaries, waste, nutrients, and gases are delivered from the blood to the tissue. Little blood arteries called capillaries create networks surrounding body cells by branching off from arterioles.
Which occurs first, gas exchange in arteries or veins?It is supplied to the blood during gas exchange from the lungs. Both the lungs and blood exchange carbon dioxide at the same time. The capillaries, a network of tiny blood veins found in the walls of the alveoli, are where this occurs in the lungs in between the individual alveoli.
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9. Which of the following best describes the valence electrons of a crystal that is an
excellent conductor?
The valence electrons of a crystal that is an excellent conductor are typically free to move throughout the crystal lattice.
This is because the crystal has a metallic bond, which is a type of chemical bond that occurs between atoms of metallic elements. In a metallic bond, valence electrons are delocalized and can move freely throughout the crystal structure, leading to the excellent conductivity of metals.
In contrast, materials with ionic or covalent bonds have electrons that are tightly bound to individual atoms and are not free to move throughout the crystal lattice. As a result, these materials are typically poor conductors of electricity.
Therefore, the valence electrons in a crystal that is an excellent conductor are delocalized and free to move, allowing the crystal to conduct electricity efficiently.
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Mary Shelley wrote Frankenstein as a teenager for a ghost story contest between friends.
True
False