Q: Which equation correctly relates the mass, volume, and density of a substance?

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

Q: Which of the following is a strong acid commonly found in laboratory settings?

Hydrochloric acid ($$\text{HCl})$$

Q: Which of the following is the correct balanced equation for the combustion of methane ($$\text{CH}_4$$)?

$$\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$$

Question 1

Which of the following best describes the role of the scientific method in chemistry?

Accepted Answer

It is a systematic approach for investigating phenomena, acquiring new knowledge, and correcting previous understanding.

Question 2

A student is asked to determine the molar mass of an unknown compound using experimental data. Which of the following steps is MOST important to ensure the accuracy of their results?

Accepted Answer

Repeating the experiment and averaging the results.

Question 3

Which equation correctly relates the mass, volume, and density of a substance?

Accepted Answer

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

Question 4

Which of the following statements about atomic structure is CORRECT?

Accepted Answer

Protons and neutrons have approximately the same mass.

Question 5

A sample contains $$2.0$$ moles of sodium chloride ($$	ext{NaCl}). $$How many formula units of $$	ext{NaCl}$$ are present in the sample?

Accepted Answer

$$1.20 	imes 10$$^{24}$$

Question 6

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

They consist of ions held together by strong electrostatic forces.

Question 7

Which of the following is the correct electron configuration for a neutral atom of oxygen ($$Z=8$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^4$$

Question 8

A chemical reaction is performed in a closed system. Which law ensures that the total mass of reactants equals the total mass of products?

Accepted Answer

Law of Conservation of Mass

Question 9

Which of the following is a strong acid commonly found in laboratory settings?

Accepted Answer

Hydrochloric acid ($$	ext{HCl})$$

Question 10

Which of the following best describes a covalent bond?

Accepted Answer

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

Question 11

A student mixes $$50.0 mL of$$ $$0.20 M$$ $$	ext{NaOH}$$ with $$50.0 mL of$$ $$0.20 M$$ $$	ext{HCl}. $$What is the pH of the resulting solution?

Accepted Answer

pH $$= 7$$

Question 12

Which of the following is the correct balanced equation for the combustion of methane ($$	ext{CH}_4$$)?

Accepted Answer

$$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$

Question 13

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.

Question 14

A solution is prepared by dissolving $$5.0 g of$$ $$	ext{NaCl} in $$enough water to make $$250 mL of $$solution. What is the molarity of the solution? ($$	ext{Molar mass of NaCl} = 58.44 g/$$mol)

Accepted Answer

$$0.20 M$$

Question 15

Which of the following is a correct statement about Lewis structures?

Accepted Answer

Lewis structures represent the arrangement of valence electrons in a molecule.

Question 16

Which of the following is the correct formula for calculating percent yield in a chemical reaction?

Accepted Answer

$$	ext{Percent Yield} = \dfrac{	ext{Actual Yield}}{	ext{Theoretical Yield}} 	imes 100\%$$

Question 17

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

Accepted Answer

Oxygen is more electronegative than hydrogen, and the molecule has a bent shape.

Question 18

A student is asked to identify an unknown gas. Which property would be MOST useful for distinguishing between oxygen ($$	ext{O}_2) $$and carbon dioxide ($$	ext{CO}_2$$)?

Accepted Answer

Ability to support combustion

Question 19

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of silver nitrate ($$	ext{AgNO}_3) $$and sodium chloride ($$	ext{NaCl}$$)?

Accepted Answer

$$	ext{Ag}^+ (aq) + 	ext{Cl}^- (aq) ightarrow 	ext{AgCl} (s)$$

Introductory General Chemistry (Lecture) – Syllabus and Study Guide

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