$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{1.00 \times 4.00}{2.00} = 2.00\ \text{L}$$

$$M = \frac{0.5\ \text{mol}}{1.0\ \text{L}} = 0.5\ \text{M}$$

Question 1

Which of the following best describes a chemical change as opposed to a physical change?

Accepted Answer

Burning of methane gas

Question 2

A sample of gas occupies 4.00 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K, assuming ideal gas behavior?

Accepted Answer

$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{1.00 	imes 4.00}{2.00} = 2.00\ 	ext{L}$$

Question 3

Which of the following is the correct balanced chemical equation for the reaction between sodium hydroxide and hydrochloric acid?

Accepted Answer

$$\mathrm{NaOH} + \mathrm{HCl} \rightarrow \mathrm{NaCl} + \mathrm{H_2O}$$

Question 4

A solution is prepared by dissolving 0.5 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{0.5\ 	ext{mol}}{1.0\ 	ext{L}} = 0.5\ 	ext{M}$$

Question 5

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$

Question 6

Which of the following statements about the periodic law is correct?

Accepted Answer

Elements are arranged in order of increasing atomic number, which determines their chemical properties.

Question 7

Which of the following best explains why water has a higher boiling point than methane?

Accepted Answer

Water molecules form hydrogen bonds, which are stronger than the London dispersion forces in methane.

Question 8

A student mixes solutions of silver nitrate and sodium chloride. A white precipitate forms. What is the identity of the precipitate?

Accepted Answer

$$\mathrm{AgCl}$$

Question 9

Which of the following is the correct formula for calculating the pH of a solution given the hydrogen ion concentration $$[H^+]$$?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[H^+]$$

Question 10

Which of the following laboratory practices is most important for safety when heating a substance in a test tube?

Accepted Answer

Point the open end of the test tube away from yourself and others.

Question 11

Which of the following best describes the process used to separate a mixture of sand and salt?

Accepted Answer

Dissolve the mixture in water, filter to remove sand, then evaporate the water to recover salt.

Question 12

Which of the following is the correct expression for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 13

Which of the following is a correct statement about chemical equilibrium?

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 14

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

Accepted Answer

A central carbon atom single-bonded to four hydrogen atoms.

Question 15

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 16

Which of the following best describes the industrial synthesis of ammonia (Haber process)?

Accepted Answer

Nitrogen and hydrogen gases react at high temperature and pressure in the presence of an iron catalyst.

Question 17

Which of the following is a property of acids?

Accepted Answer

They turn blue litmus paper red.

Question 18

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

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

Question 19

Which of the following is a correct statement about electrolytes?

Accepted Answer

Strong electrolytes dissociate completely in water, conducting electricity well.

Question 20

Which of the following best describes the intermolecular forces present in liquid ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Hydrogen bonding and London dispersion forces

General Chemistry Examination Syllabus: Key Concepts and Study Guide

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