f chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. What kind of reaction took place?

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Answer 1

Answer: If chlorine gas is bubbled through an aqueous solution of sodium iodide, the result is elemental iodine and aqueous sodium chloride solution. The kind ofreaction that took place is decomposition reaction. Because sodium iodide is broken down into sodium and iodide atoms.

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Which gas occupies the highest volume at STP?0.02 mol of O20.1 mol of Cl21 mol of N22 mol of H2

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The correct answer is the fourth option. The gas, 2 mol of H2, occupies the highest volume at STP since at STP the volume of this gas is approximately 44.8 mol as compared to other options this has the greatest amount. At STP, 1 mol of a gas is said to be equal to a volume of 22.4 L.

35g of HF was prepared by reacting 112g of CaF2 with an excess of H2SO4 calculate the percentage yield

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Answer: 61%

The reaction equation should be

CaF2 + H2SO4 → 2HF + CaSO4

For every 1 molecule CaF2 used, there will be 2 molecules of HF formed. The molecular mass of CaF2 is 78/mol while the molecular mass of HF is 20g/mol. If the yield is 100%, the amount of HF formed by 112g CaF2 would be: 112g/(78g/mol) * 2 * (20g/mol)=57.43g

The percentage yield of the reaction would be: 35g/57.43g= 60.94%

Assume that 13.5 g solid aluminum (Al) react with HCl to produce solid aluminum chloride (AlCl3) salt and gaseous hydrogen (H2) at standard temperature and pressure.How many moles of Al react?

How many moles of H2 are produced?

How many liters of H2 are produced?

Answers

0.5 moles $\bold {Al}$ is required for the given reaction to occur. Mole is a constant that represents a certain amount of particles such as atoms, ions, or molecules.

What is the Mole concept?

It is the number or constant that represents a certain amount of particles such as atoms, ions, or molecules.

1 mole = $6.02 * 10^2^3$ particles.

$n = \frac wm$

Where,

$n$ - number of moles

$w$ - given mass = 13.5 g.

$m$ - molar mass = 26.98 g/mol.

Put the values in the formula,

$n = \frac {13.5} {26.98}\n\nn = 0.5\rm \ mol.$

Therefore, 0.5 moles $\bold {Al}$ is required for the given reaction to occur.

Learn more about Mole concept:

brainly.com/question/7287712

Answer:

1) 0.5 mol.

2) 0.75 mol.

3) 16.8 L.

Explanation:

1) How many moles of Al react?

We can calculate the number of moles of Al (n) using the relation:

n = mass / molar mass,

Mass of Al = 13.5 g.

Molar mass mass of Al = 26.98 g/mol.

∴ The number of moles of Al (n) = mass / molar mass = (13.5 g) / (26.98 g/mol) = 0.5 mol.

2) How many moles of H₂ are produced?

It is a stichiometry problem.

We should write the balanced equation of the reaction:

2Al + 6HCl → 2AlCl₃ + 3H₂.

It is clear that 2.0 moles of Al reacts with 6.0 moles of HCl to produce 2.0 moles of AlCl₃ and 3.0 moles of H₂.

Using the cross multiplication:

2.0 moles of Al → 3.0 moles of H₂, from the stichiometry,

0.5 mole of Al → ??? moles of H₂.

∴ The number of moles of H₂ are produced = (0.5 mole)(3.0 mole) / (2.0 mole) = 0.75 mol.

3) How many liters of H₂ are produced?

It is known that at STP, 1.0 mole of any gas occupies a volume of 22.4 L.

Using cross multiplication:

1.0 mole occupies → 22.4 L.

0.75 mole occupies → ??? L.

∴The number of liters of H₂ are produced = (0.75 mole)(22.4 L) / (1.0 mole) = 16.8 L.

Describe the role of energy in chemical reactions.

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Energy in a chemical reaction is not created nor destroyed, it's always conserved based on the law of conservation of energy.

Which energy changes are associated with a liquid freezing?

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Answer:

energy is released as potential energy decreases

Explanation:

EGD2020

From a liquid to a solid.

During an experiment, a student observes the formation of a precipitate. Why does this indicate that a chemical reaction is likely occurring?

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The formation of a precipitate is always caused by a chemical reaction between a liquid solution and a precipitant. When solid particles suddenly appear in a sample of liquid under experimentation, that is an obvious sign that a reaction has occurred. Precipitates possess various qualities such as color and size. The only exception to this is when a precipitate forms when solubility of a solute is exceeded.

Answer:

A solid forms, and there is a change of color.

Explanation:

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