Q: A sample of 14 karat gold has a mass of 110 g and a volume of 6.0 mL. What is its density?

$$\frac{110}{6.0} = 13.3\ \text{g/mL}$$

Q: Which of the following is a strong electrolyte?

Sodium chloride ($$\text{NaCl})$$

Q: Which of the following is the correct equilibrium constant expression for the reaction $$\text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g)$$?

$$K = \frac{[\text{NH}_3]^2}{[\text{N}_2][\text{H}_2]^3}$$

Q: Which of the following is the correct formula for calculating the number of half-lives elapsed?

$$\text{Number of half-lives} = \frac{\text{total time}}{\text{half-life}}$$

Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Chocolate chip cookie

Question 2

A sample of 14 karat gold has a mass of 110 g and a volume of 6.0 mL. What is its density?

Accepted Answer

$$\frac{110}{6.0} = 13.3\ 	ext{g/mL}$$

Question 3

Which statement best describes a chemical change?

Accepted Answer

A change in the chemical identity of a substance, such as rusting iron

Question 4

How many protons, neutrons, and electrons are in $$^{14}_{6}	ext{C}$$?

Accepted Answer

6 protons, 8 neutrons, 6 electrons

Question 5

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons

Question 6

Which nuclear particle is represented by $$^{4}_{2}	ext{He}$$?

Accepted Answer

Alpha particle

Question 7

If a radioactive isotope has a half-life of 10 years, how much of a 100 g sample remains after 30 years?

Accepted Answer

12.5 g

Question 8

Which electron configuration represents a sodium atom ($$Z=11$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$

Question 9

Which of the following elements is most likely to form a $$2^+$$ ion?

Accepted Answer

Magnesium (Mg)

Question 10

What is the formula for ethane?

Accepted Answer

$$	ext{C}_2	ext{H}_6$$

Question 11

Which of the following is a property of gases?

Accepted Answer

Expand to fill container

Question 12

A sample of gas has a pressure of 2.0 atm and a volume of 4.0 L. If the volume is decreased to 2.0 L at constant temperature, what is the new pressure?

Accepted Answer

$$4.0\ 	ext{atm}$$

Question 13

Which intermolecular force is strongest in water?

Accepted Answer

Hydrogen bonding

Question 14

Which of the following is a strong electrolyte?

Accepted Answer

Sodium chloride ($$	ext{NaCl})$$

Question 15

Which of the following is the correct equilibrium constant expression for the reaction $$	ext{N}_2(g) + 3	ext{H}_2(g) ightleftharpoons 2	ext{NH}_3(g)$$?

Accepted Answer

$$K = \frac{[	ext{NH}_3]^2}{[	ext{N}_2][	ext{H}_2]^3}$$

Question 16

Which statement about acids and bases is correct?

Accepted Answer

A strong acid has a high $$K_a$$ value

Question 17

Which of the following is a physical change?

Accepted Answer

Melting ice

Question 18

Which of the following best describes the effect of temperature on the solubility of solids in liquids?

Accepted Answer

Increasing temperature increases solubility

Question 19

Which of the following is the correct formula for calculating the number of half-lives elapsed?

Accepted Answer

$$	ext{Number of half-lives} = \frac{	ext{total time}}{	ext{half-life}}$$

General Chemistry I: Comprehensive Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard