Q: A sample of gold has a mass of 19.3 g and a volume of 1.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

$$\frac{19.3\ \text{g}}{1.00\ \text{cm}^3} = 19.3\ \text{g/cm}^3$$

Q: How many moles are in $$1.20 \times 10$$^{24}$$ molecules of water ($$\text{H}_2\text{O}$$)?

$$\frac{1.20 \times 10$$^{24}$$}{6.02 \times 10$$^{23}$$} = 1.99\ \text{mol}$$

Q: Which of the following is a strong electrolyte?

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

Q: A solution is prepared by dissolving 10 g of salt in 90 g of water. What is the % (m/m) concentration?

$$\frac{10\ \text{g}}{100\ \text{g}} \times 100\% = 10\%$$

Q: Which of the following is a neutralization reaction?

$$\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}$$

Question 1

Which of the following best describes a mixture that is uniform throughout and cannot be separated by filtration?

Accepted Answer

A homogeneous mixture

Question 2

A sample of gold has a mass of 19.3 g and a volume of 1.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$\frac{19.3\ 	ext{g}}{1.00\ 	ext{cm}^3} = 19.3\ 	ext{g/cm}^3$$

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 4

An atom of magnesium has 12 protons, 12 neutrons, and 12 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number: 12, Mass number: 24

Question 5

Which nuclear emission is represented by the symbol $$\alpha$$ and what is its composition?

Accepted Answer

$$\alpha$$; composed of two protons and two neutrons

Question 6

A radioactive isotope has a half-life of 3 hours. If you start with 80 g, how much remains after 9 hours?

Accepted Answer

10 g

Question 7

Which element is most likely to form a $$2+$$ cation to achieve a noble gas configuration?

Accepted Answer

Calcium ($$	ext{Ca})$$

Question 8

How many moles are in $$1.20 	imes 10$$^{24}$$ molecules of water ($$	ext{H}_2	ext{O}$$)?

Accepted Answer

$$\frac{1.20 	imes 10$$^{24}$$}{6.02 	imes 10$$^{23}$$} = 1.99\ 	ext{mol}$$

Question 9

Which of the following is the correct general formula for a cycloalkane with $$n$$ carbon atoms?

Accepted Answer

$$	ext{C}_n	ext{H}_{2n}$$

Question 10

Which functional group is present in ethanol ($$	ext{CH}_3	ext{CH}_2	ext{OH}$$)?

Accepted Answer

Alcohol

Question 11

Which statement best describes an exothermic reaction?

Accepted Answer

A reaction that releases heat to the surroundings

Question 12

Which of the following factors will increase the rate of a chemical reaction?

Accepted Answer

Increasing temperature

Question 13

A reaction in which two compounds exchange ions to form two new compounds is called:

Accepted Answer

Exchange (displacement) reaction

Question 14

Which gas law relates the volume and pressure of a gas at constant temperature?

Accepted Answer

Boyle's Law: $$P_1V_1 = P_2V_2$$

Question 15

Which of the following is a strong electrolyte?

Accepted Answer

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

Question 16

A solution is prepared by dissolving 10 g of salt in 90 g of water. What is the % (m/m) concentration?

Accepted Answer

$$\frac{10\ 	ext{g}}{100\ 	ext{g}} 	imes 100\% = 10\%$$

Question 17

Which of the following is a neutralization reaction?

Accepted Answer

$$	ext{HCl} + 	ext{NaOH} ightarrow 	ext{NaCl} + 	ext{H}_2	ext{O}$$

Question 18

Which expression represents the equilibrium constant ($$K) $$for the reaction $$	ext{N}_2 + 3	ext{H}_2 ightleftharpoons 2	ext{NH}_3$$?

Accepted Answer

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

Question 19

Which solution has the lowest pH?

Accepted Answer

A solution of hydrochloric acid ($$	ext{HCl})$$

Question 20

If a solution has a pH of 8, which statement is true?

Accepted Answer

The solution is basic

CHEM 1001 Final Exam Study Guide: Core Concepts and Practice Topics

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