Question 1

Which of the following best describes a compound?

Accepted Answer

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

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice into water.

Question 3

A sample of gold has a mass of 57.3 g and a volume of 2.97 cm$$^3. $$What is the density of gold in g/cm$$^3$$? (Report your answer with the correct number of significant figures.)

Accepted Answer

$$19.3 g/cm$^3$$

Question 4

Which of the following statements about kinetic and potential energy is correct?

Accepted Answer

Kinetic energy increases as the velocity of an object increases.

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 6

A student measures the mass of a sample three times and gets values of 2.45 g, 2.46 g, and 2.44 g. The true mass is 2.80 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 7

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 8

Convert $$3.000$$ meters to inches. (1 in = 2.54 cm; 1 m = 100 cm)

Accepted Answer

$$118.1 in$$

Question 9

Which of the following best illustrates the Law of Constant Composition?

Accepted Answer

Water from different sources always contains hydrogen and oxygen in a 2:1 ratio.

Question 10

A beaker contains $$12.0 in$^3 of $$tea. What is the volume in mL? (1 in = 2.54 cm; 1 mL = 1 cm$$^3)$$

Accepted Answer

$$197 mL$$

Question 11

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 12

Which of the following numbers has 3 significant figures?

Accepted Answer

0.0486

Question 13

Which of the following is the correct result for $$6.578 - 4.5$$ with the proper number of significant figures?

Accepted Answer

$$2.1$$

Question 14

A sample of gas is transferred from a 2.00 L container to a 500.0 mL container. What is the new volume in liters?

Accepted Answer

$$0.500 L$$

Question 15

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 16

Which metric prefix corresponds to $$10^{-6}$$?

Accepted Answer

Micro

Question 17

A ball bearing has a diameter of $$0.30 cm. $$What is the diameter in inches? (1 in = 2.54 cm)

Accepted Answer

$$0.12 in$$

Question 18

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with visibly different parts or phases.

Question 19

Which of the following is an exact number?

Accepted Answer

1 inch = 2.54 cm

Question 20

Which of the following best explains why temperature must be measured in Kelvin for gas law calculations?

Accepted Answer

Kelvin is the only scale with no negative values, making it proportional to kinetic energy.

General Chemistry I - CHM 101: Chapter 1 Study Notes – Matter, Energy & Measurement

Guida di studio - Domande di pratica

Study guide - Flashcard