Question 1

When the equation $$\mathrm{N_2$ + H_2$ \rightarrow NH_3$} is $$balanced, what are the coefficients for $$\mathrm{N_2$}$$, $$\mathrm{H_2$}$$, and $$\mathrm{NH_3$}$$, respectively?

Accepted Answer

1, 3, 2

Question 2

Balance the following chemical equation: $$\_\_\_\ \mathrm{CH_4$} + \_\_\_\ \mathrm{O_2$} \rightarrow \_\_\_\ \mathrm{CO_2$} + \_\_\_\ \mathrm{H_2O}. $$Which set of coefficients correctly balances the equation?

Accepted Answer

1, 2, 1, 2

Question 3

A solution is prepared by mixing 20 grams of sugar with 100 grams of water. Which of the following statements is correct?

Accepted Answer

Water is the solvent and sugar is the solute.

Question 4

When an ionic compound such as $$\mathrm{NaCl(s)}$$ dissolves in water, the process of surrounding each ion with solvent molecules is called:

Accepted Answer

Solvation

Question 5

Which of the following compounds would form a non-electrolyte solution when dissolved in water? Select the best answer.

Accepted Answer

$$\mathrm{SO_2$}$$

Question 6

Which statement best describes an electrolyte?

Accepted Answer

A substance that forms ions in water and conducts electricity.

Question 7

A nurse prepares an IV solution by dissolving $$0.90\ \mathrm{g} of$$ $$\mathrm{NaCl} in$$ $$100\ \mathrm{mL} of $$water. What is the solute in this solution?

Accepted Answer

$$\mathrm{NaCl}$$

Question 8

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more substances.

Question 9

Calculate the molarity of a solution prepared by dissolving $$5.0\ \mathrm{mol} of$$ $$\mathrm{NaOH} in$$ $$2.0\ \mathrm{L} of $$solution.

Accepted Answer

$$2.5\ \mathrm{M}$$

Question 10

A student prepares a $$200\ \mathrm{mL}$$ solution containing $$0.30\ \mathrm{mol}$$ $$\mathrm{HCl}. $$What is the molarity of the solution?

Accepted Answer

$$1.5\ \mathrm{M}$$

Question 11

What is the concentration of a solution that contains $$4.50\ \mathrm{mol} of$$ $$\mathrm{NaF}$$ dissolved in $$7.50\ \mathrm{L} of $$solution?

Accepted Answer

$$0.600\ \mathrm{M}$$

Question 12

How many moles of $$\mathrm{NH_3$}$$ are present in $$1.50\ \mathrm{L} of a$$ $$0.500\ \mathrm{M}$$ $$\mathrm{NH_3$}$$ solution?

Accepted Answer

$$0.750\ \mathrm{mol}$$

Question 13

Calculate the number of moles in $$500\ \mathrm{mL} of$$ $$0.400\ \mathrm{M}$$ $$\mathrm{HCl}.$$

Accepted Answer

$$0.200\ \mathrm{mol}$$

Question 14

Which of the following is a property of a solution?

Accepted Answer

It is clear and does not scatter light.

Question 15

A sports drink contains water, sugar, and electrolytes. In this solution, which component is the solvent?

Accepted Answer

Water

Question 16

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water?

Accepted Answer

$$\mathrm{NaCl}$$ dissociates into ions in water.

Question 17

A patient receives an IV solution containing $$0.9\%$$ $$\mathrm{NaCl} in $$water. Why is it important that the solution is isotonic to blood?

Accepted Answer

To avoid causing cells to shrink or burst due to osmosis.

Question 18

Which of the following is a correct definition of molarity ($$M$$)?

Accepted Answer

The number of moles of solute per liter of solution.

Question 19

Which of the following best describes the process shown when salt is added to water and the solution becomes clear?

Accepted Answer

Salt dissolves, forming a homogeneous solution.

Question 20

A $$250\ \mathrm{mL}$$ solution contains $$0.125\ \mathrm{mol} of$$ $$\mathrm{KCl}. $$What is the molarity of the solution?

Accepted Answer

$$0.500\ \mathrm{M}$$

Chapter 9: Solutions – Key Concepts and Calculations

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