Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air.

Question 2

Which of the following is the correct equation for converting Celsius temperature to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 3

A student measures the mass of a sample as 12.34 g and its volume as 4.56 mL. What is the density of the sample?

Accepted Answer

$$2.71\ \mathrm{g/mL}$$

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 5

Which of the following is the correct electron configuration for a sodium ion ($$\mathrm{Na^+}$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$

Question 6

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of electrons from a metal to a nonmetal.

Question 7

What is the correct formula for calcium chloride?

Accepted Answer

$$\mathrm{$$CaCl_2$$}$$

Question 8

Which of the following molecules has a linear geometry according to VSEPR theory?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

Which of the following is a balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

$$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$

Question 10

A reaction has an actual yield of 8.0 g and a theoretical yield of 10.0 g. What is the percent yield?

Accepted Answer

$$80\%$$

Question 11

Which of the following statements about exothermic reactions is correct?

Accepted Answer

Exothermic reactions release heat to the surroundings.

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 an example of a colligative property?

Accepted Answer

Boiling point elevation

Question 14

Which of the following is the correct definition of molarity?

Accepted Answer

Moles of solute per liter of solution

Question 15

Which of the following is a Bronsted-Lowry acid?

Accepted Answer

A substance that donates a proton ($$\mathrm{H^+})$$

Question 16

A solution has a pH of 3. Which of the following best describes the solution?

Accepted Answer

Strongly acidic

Question 17

Which of the following types of radiation has the greatest penetrating power?

Accepted Answer

Gamma rays

Question 18

Which of the following equations represents the half-life ($$t_{1/2}) of a $$first-order nuclear decay process?

Accepted Answer

$$t_{1/2} = \dfrac{0.693}{k}$$

Question 19

Which of the following best describes the process of osmosis?

Accepted Answer

The movement of solvent molecules through a semipermeable membrane from a region of lower solute concentration to higher solute concentration.

General Chemistry I (CHE 121) Syllabus and Study Guide

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