$$\frac{8\,g}{200\,mL} \times 100 = 4\%$$

$$\frac{15\,g}{300\,mL} \times 100 = 5\%$$

Question 1

Which of the following best describes an aqueous solution?

Accepted Answer

A solution where the solvent is water.

Question 2

You dissolve 8 grams of salt in 200 mL of water. What is the percent solution?

Accepted Answer

$$\frac{8\,g}{200\,mL} 	imes 100 = 4\%$$

Question 3

Which of the following is an example of a non-aqueous solution?

Accepted Answer

Gasoline with dissolved additives.

Question 4

A medication is dispensed as a 5% solution. How many grams of drug are in 100 mL of this solution?

Accepted Answer

5 grams

Question 5

Which of the following best describes a chemical reaction?

Accepted Answer

A process where chemical bonds are broken or formed, and energy is absorbed or released.

Question 6

Which equation is balanced?

Accepted Answer

$$2Na + 2H_2O \rightarrow H_2$ + 2NaOH$$

Question 7

What type of chemical reaction is represented by $$2H_2O \rightarrow 2H_2 + O_2$?

Accepted Answer

Decomposition reaction

Question 8

Which of the following is true about reversible reactions?

Accepted Answer

They are represented by a two-headed arrow ($$\rightleftharpoons).$$

Question 9

Balance the following equation: $$H_2$$ + $$N_2$$ \rightarrow $$NH_3$$

Accepted Answer

$$3H_2 + N_2$ \rightarrow 2NH_3$$

Question 10

Which of the following best describes the role of a solvent in a solution?

Accepted Answer

The solvent is the liquid in which the solute is dissolved.

Question 11

A solution contains 15 g of glucose in 300 mL of water. What is the percent solution?

Accepted Answer

$$\frac{15\,g}{300\,mL} 	imes 100 = 5\%$$

Question 12

Which of the following is NOT an example of an aqueous solution?

Accepted Answer

Gasoline with dissolved additives

Question 13

Which of the following is a correct interpretation of the reaction $$CO_2 + H_2O$$ \rightleftharpoons H_2CO_3$$?

Accepted Answer

One molecule of carbon dioxide reacts with one molecule of water to form one molecule of carbonic acid, and the reaction is reversible.

Question 14

Which of the following is the correct balanced equation for the decomposition of hydrogen peroxide ($$H_2O_2) $$into water and oxygen?

Accepted Answer

$$2H_2O_2 \rightarrow 2H_2O + O_2$

Question 15

Which of the following best describes a combination reaction?

Accepted Answer

Two or more reactants combine to form a single product.

Question 16

A scientist mixes 10 g of a drug in 250 mL of saline solution. What is the percent solution?

Accepted Answer

$$\frac{10\,g}{250\,mL} 	imes 100 = 4\%$$

Question 17

Which of the following is a correct statement about balancing chemical equations?

Accepted Answer

The number of atoms of each element must be the same on both sides of the equation.

Question 18

Which of the following is the correct balanced equation for the reaction: $$2NaOH \rightarrow Na_2O + H_2O$$?

Accepted Answer

$$2NaOH \rightarrow Na_2O + H_2O$$

Question 19

Which of the following is a recombination reaction?

Accepted Answer

$$NaCl + $$AgNO_3$$ \rightarrow $$NaNO_3$$ + AgCl$$

Chemical Foundations of Life: Solutions and Chemical Reactions

Study Guide - Practice Questions