Question 1

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

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 2

A student mixes 10.0 g of hydrogen gas with 80.0 g of oxygen gas to produce water. According to the Law of Conservation of Mass, what is the total mass of water produced?

Accepted Answer

$$90.0\ \mathrm{g}$$

Question 3

Which statement best explains why ionic compounds tend to have high melting points?

Accepted Answer

Ionic compounds have strong electrostatic attractions between oppositely charged ions.

Question 4

Which of the following is a correct balanced chemical equation for the reaction of sodium with chlorine to form sodium chloride?

Accepted Answer

$$2\ \mathrm{Na} + \mathrm{Cl}_2 \rightarrow 2\ \mathrm{NaCl}$$

Question 5

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electron pairs between atoms.

Question 6

A sample of gas occupies $$2.0\ \mathrm{L} at$$ $$1.0\ \mathrm{atm}$$ pressure. If the pressure is increased to $$4.0\ \mathrm{atm} at $$constant temperature, what is the new volume of the gas?

Accepted Answer

$$0.5\ \mathrm{L}$$

Question 7

Which of the following is NOT a property of acids?

Accepted Answer

They feel slippery to the touch.

Question 8

Which of the following best describes the process of oxidation in a chemical reaction?

Accepted Answer

Loss of electrons by a substance.

Question 9

A solution is prepared by dissolving $$5.0\ \mathrm{mol} of $$NaCl in $$2.0\ \mathrm{L} of $$water. What is the molarity of the solution?

Accepted Answer

$$2.5\ \mathrm{M}$$

Question 10

Which of the following is a correct statement about the periodic table?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 11

Which of the following is the correct formula for calculating the density of a substance?

Accepted Answer

$$\mathrm{Density} = \dfrac{\mathrm{Mass}}{\mathrm{Volume}}$$

Question 12

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

Water has an uneven distribution of electrons, resulting in partial charges.

Question 13

A chemical reaction has the following equation: $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 \rightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O}. $$What type of reaction is this?

Accepted Answer

Combustion

Question 14

Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

Accepted Answer

$$\mathrm{Moles} = \dfrac{\mathrm{Mass}}{\mathrm{Molar\ Mass}}$$

Question 15

Which of the following best describes a catalyst in a chemical reaction?

Accepted Answer

A substance that increases the rate of a reaction without being consumed.

Question 16

Which of the following is a correct statement about the pH scale?

Accepted Answer

A solution with pH 7 is neutral.

Question 17

A patient is given a saline solution containing $$0.9\%$$ NaCl by mass. If the patient receives $$500\ \mathrm{mL} of $$solution, how many grams of NaCl did they receive?

Accepted Answer

$$4.5\ \mathrm{g}$$

Question 18

Which of the following best describes the difference between a physical change and a chemical change?

Accepted Answer

A chemical change results in the formation of new substances with different properties.

Question 19

Which of the following is the correct formula for Boyle's Law?

Accepted Answer

$$P_1V_1 = P_2V_2$$

Introduction to Chemistry: Final Exam Study Guide and Key Topics

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