Question 1

Which of the following best describes the Law of Conservation of Mass as it applies to a chemical reaction?

Accepted Answer

The total mass of reactants equals the total mass of products in a closed system.

Question 2

A student measures the mass of a sample as $$2.50 \ \mathrm{g}$$ and its volume as $$1.25 \ \mathrm{mL}. $$What is the density of the sample?

Accepted Answer

$$2.00 \ \mathrm{g/mL}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

A piece of iron rusts when left outside.

Question 4

Which statement about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 5

Which of the following compounds is most likely to be ionic?

Accepted Answer

$$\mathrm{NaCl}$$

Question 6

A sample contains $$0.50 \ \mathrm{mol} of$$ $$\mathrm{NaCl}. $$What is the mass of the sample? (Molar mass of $$\mathrm{NaCl} = 58.44 \ \mathrm{g/mol})$$

Accepted Answer

$$29.22 \ \mathrm{g}$$

Question 7

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more substances.

Question 8

Which of the following correctly represents the relationship for a dilution calculation?

Accepted Answer

$$M_1$$ $$V_1$$ = $$M_2$$ $$V_2$$

Question 9

A $$0.10 \ \mathrm{M}$$ solution of hydrochloric acid ($$\mathrm{HCl}) $$has a pH closest to:

Accepted Answer

1

Question 10

Which of the following is a correct Lewis structure for methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

A central carbon atom with four single bonds to four hydrogen atoms.

Question 11

Which of the following gases will occupy the largest volume at STP, assuming you have $$1.00 \ \mathrm{mol} of $$each gas?

Accepted Answer

All gases will occupy the same volume at STP.

Question 12

Which of the following is a correct metric-metric conversion?

Accepted Answer

$$1 \ \mathrm{kg} = 1000 \ \mathrm{g}$$

Question 13

Which of the following best describes a saturated hydrocarbon?

Accepted Answer

A hydrocarbon containing only single bonds between carbon atoms.

Question 14

A $$2.00 \ \mathrm{L}$$ solution contains $$0.50 \ \mathrm{mol} of$$ $$\mathrm{NaOH}. $$What is the molarity of the solution?

Accepted Answer

$$0.25 \ \mathrm{M}$$

Question 15

Which of the following is a property of a strong electrolyte in aqueous solution?

Accepted Answer

It completely dissociates into ions.

Question 16

Which of the following best explains why water ($$\mathrm{H_2O}) is a $$polar molecule?

Accepted Answer

It has a bent shape and an unequal sharing of electrons.

Question 17

A chemical reaction is classified as a combustion reaction if:

Accepted Answer

A hydrocarbon reacts with oxygen to produce carbon dioxide and water.

Question 18

Which of the following is the correct scientific notation for the number $$0.00056$$?

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 19

A patient receives $$500 \ \mathrm{mL} of a$$ $$0.90\% (w/v) $$saline solution. How many grams of $$\mathrm{NaCl}$$ are in the solution?

Accepted Answer

$$4.5 \ \mathrm{g}$$

Question 20

Which of the following best describes the trend in atomic radius across a period in the periodic table?

Accepted Answer

Atomic radius decreases from left to right.

Introductory Chemistry (CHEM-110) Syllabus and Course Overview

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