Question 1

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which SI unit would you use to measure the amount of a chemical substance in a laboratory experiment?

Accepted Answer

Mole

Question 3

A student measures the mass of a metal sample as 45.6 g and its volume as 12.0 mL. What is the density of the metal?

$$ d = \frac{m}{V} $$

Accepted Answer

3.80 g/mL

Question 4

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 5

Which statement correctly describes the location of subatomic particles in an atom?

Accepted Answer

Protons and neutrons are in the nucleus; electrons orbit the nucleus.

Question 6

Which of the following best explains why ionic bonds form between metals and nonmetals?

Accepted Answer

Metals lose electrons to nonmetals, resulting in the formation of oppositely charged ions that attract each other.

Question 7

A chemist needs to measure the temperature of a reaction. Which SI unit should be used?

Accepted Answer

Kelvin

Question 8

Which of the following is an example of a covalent bond?

Accepted Answer

The bond between hydrogen and oxygen in $$ H_2O $$

Question 9

A student records the following measurements: 2.50 m, 2.5 m, and 2.500 m. Which measurement has the greatest number of significant figures?

Accepted Answer

2.500 m

Question 10

Which property distinguishes a solid from a liquid and a gas?

Accepted Answer

Solids have a fixed shape and volume.

Question 11

Which of the following best describes the periodic table's organization?

Accepted Answer

Elements are arranged by increasing atomic number.

Question 12

A sample of liquid has a mass of 80.0 g and occupies a volume of 100.0 mL. What is its density?

$$ d = \frac{m}{V} $$

Accepted Answer

0.80 g/mL

Question 13

Which of the following is an example of a measurement with the correct SI unit for length?

Accepted Answer

5.0 m

Question 14

Which of the following statements about elements is correct?

Accepted Answer

Elements are pure substances that cannot be broken down by chemical means.

Question 15

A student mixes salt ($$ NaCl ) $$and water ($$ H_2O ) in a $$beaker. Which type of matter is formed?

Accepted Answer

Mixture

Question 16

Which of the following is a correct application of significant figures when multiplying 2.50 m by 3.0 m?

Accepted Answer

7.5 $$ m^2$ $$

Question 17

Which of the following best describes the difference between a pure substance and a mixture?

Accepted Answer

A pure substance has a fixed composition, while a mixture has variable composition.

Question 18

Which of the following is a real-world example of an ionic bond?

Accepted Answer

The bond between sodium and chlorine in table salt ($$ NaCl )$$

Question 19

A student needs to calculate the density of a gas sample. The mass is 0.80 g and the volume is 1.0 L. What is the density in g/L?

$$ d = \frac{m}{V} $$

Accepted Answer

0.80 g/L

Question 20

Which of the following is NOT an SI unit?

Accepted Answer

Gram

Matter and Measurements: Fundamental Concepts in General Chemistry

Study Guide - Practice Questions