$$\text{Molarity} = \dfrac{\text{moles of solute}}{\text{volume of solution in liters}}$$

Question 1

Which of the following best defines chemistry?

Accepted Answer

The study of matter, its properties, and the changes it undergoes.

Question 2

Which statement correctly describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 3

A student measures the length of a metal rod as 12.30 cm. Which digit is the estimated digit in this measurement?

Accepted Answer

0

Question 4

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water.

Question 5

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 6

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 7

Which of the following best describes an ionic compound?

Accepted Answer

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

Question 8

What is the molar mass of $$\mathrm{Na}_2\mathrm{SO}_4$$?

Accepted Answer

$$142\ \mathrm{g/mol}$$

Question 9

Which of the following is the correct electron configuration for a neutral atom of nitrogen ($$Z=7$$)?

Accepted Answer

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

Question 10

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 11

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

Accepted Answer

$$80\%$$

Question 12

Which of the following best describes a polar covalent bond?

Accepted Answer

A bond where electrons are shared unequally between atoms.

Question 13

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO}_2$$

Question 14

Which of the following is the correct formula for aluminum sulfate?

Accepted Answer

$$\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$$

Question 15

Which of the following is a strong acid?

Accepted Answer

$$\mathrm{HCl}$$

Question 16

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Question 17

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

Accepted Answer

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

Question 18

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$$	ext{Molarity} = \dfrac{	ext{moles of solute}}{	ext{volume of solution in liters}}$$

Question 19

A sample contains $$3.01 	imes 10$$^{23}$$ molecules of water. How many moles of water are present?

Accepted Answer

$$0.5\ 	ext{mol}$$

Question 20

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

Accepted Answer

They are composed of ions held together by strong electrostatic forces.

Comprehensive Study Notes for Introduction to Chemistry Final Exam Topics

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