Question 1

Which of the following best describes why gases can be compressed much more easily than solids or liquids?

Accepted Answer

Because gas particles are far apart and move freely, allowing the volume to decrease significantly under pressure.

Question 2

A student measures the mass of a liquid as 12.34 g and its volume as 4.5 mL. What is the density of the liquid, reported with the correct number of significant figures?

Accepted Answer

$$d = \frac{12.34\ \mathrm{g}}{4.5\ \mathrm{mL}} = 2.7\ \mathrm{g/mL}$$

Question 3

Which of the following statements about elements and compounds is correct?

Accepted Answer

An element cannot be broken down into simpler substances by chemical means, while a compound can.

Question 4

Which of the following is an example of a pure substance?

Accepted Answer

Oxygen gas ($$\mathrm{O}_2)$$

Question 5

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm$$^3. $$What is the density of gold?

Accepted Answer

$$d = \frac{96.5\ \mathrm{g}}{5.00\ \mathrm{cm}^3} = 19.3\ \mathrm{g/cm}^3$$

Question 6

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) is $$classified as a compound?

Accepted Answer

It is composed of two elements chemically combined in a fixed ratio.

Question 7

Which of the following is the correct SI unit for measuring temperature in scientific experiments?

Accepted Answer

Kelvin ($$\mathrm{K})$$

Question 8

Which statement correctly describes the arrangement and movement of particles in a liquid?

Accepted Answer

Particles are close together but can move past one another, allowing the liquid to flow.

Question 9

A chemist adds 2.50 g of salt to 47.5 g of water. What is the total mass of the resulting solution, and how many significant figures should the answer have?

Accepted Answer

50.0 g, with three significant figures

Question 10

Which of the following best describes the difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between nonmetals.

Question 11

Which property is NOT characteristic of a solid?

Accepted Answer

Particles move freely and occupy the entire volume of their container.

Question 12

Which of the following statements about the periodic table is correct?

Accepted Answer

Elements in the same group have similar chemical properties.

Question 13

A student records the following measurements: 3.45 m, 2.1 m, and 0.678 m. What is the sum, reported with the correct number of decimal places?

Accepted Answer

6.2 m

Question 14

Which of the following is NOT an SI base unit?

Accepted Answer

Liter ($$\mathrm{L})$$

Question 15

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 16

A block of unknown material has a mass of 24.0 g and a density of $$8.0\ \mathrm{g/cm}^3. $$What is its volume?

Accepted Answer

$$V = \frac{m}{d} = \frac{24.0\ \mathrm{g}}{8.0\ \mathrm{g/cm}^3} = 3.0\ \mathrm{cm}^3$$

Question 17

Which of the following best explains why water ($$\mathrm{H}_2\mathrm{O}) is $$considered a compound and not an element?

Accepted Answer

It is composed of two different elements chemically combined in a fixed ratio.

Question 18

Which of the following is a correct statement about significant figures in multiplication and division?

Accepted Answer

The result should have as many significant figures as the measurement with the fewest significant figures.

Question 19

Which of the following best describes the location and charge of neutrons in an atom?

Accepted Answer

Neutrons are neutral particles located in the nucleus.

Question 20

Which of the following real-world scenarios best illustrates the concept of density?

Accepted Answer

A piece of wood floats on water because its density is less than that of water.

Fundamental Concepts in General Chemistry: Matter, Atomic Structure, Bonding, and Measurement

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