Q: Which of the following is the correct conversion factor for inches to centimeters?

$$1 \text{ in} = 2.54 \text{ cm}$$

Q: A student needs to convert 25.0 $$^\circC to $$Fahrenheit. Which formula should they use?

$$^\circ F = \frac{9}{5} \times ^\circ C + 32$$

Question 1

Which of the following best describes a chemical property?

Accepted Answer

The ability of iron to rust when exposed to oxygen

Question 2

A student mixes oil and vinegar to make a salad dressing. After shaking, the mixture separates into two layers. This mixture is best classified as:

Accepted Answer

A heterogeneous mixture

Question 3

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

Accepted Answer

Mass

Question 4

A sample of gold is hammered into a thin sheet. Which type of change has occurred?

Accepted Answer

Physical change

Question 5

Which of the following statements about the law of conservation of matter is correct?

Accepted Answer

The total quantity of matter remains constant during any physical or chemical change.

Question 6

Which of the following is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 7

A student measures the mass of a sample as 12.11 g, 18.0 g, and 1.013 g. What is the correct sum, reported with the proper number of significant figures?

Accepted Answer

31.1 g

Question 8

Which of the following is NOT a correct statement about elements and compounds?

Accepted Answer

A compound can be separated into its elements by physical means.

Question 9

Which of the following is a correct example of a physical property?

Accepted Answer

The boiling point of ethanol is $$78.37^\circ C$$

Question 10

A scientist records the following measurements: 1.008, 2.00, and 100. Which of these numbers has exactly three significant figures?

Accepted Answer

2.00

Question 11

Which of the following best describes the microscopic domain in chemistry?

Accepted Answer

It involves atoms and molecules that are too small to be seen directly.

Question 12

Which of the following is the correct conversion factor for inches to centimeters?

Accepted Answer

$$1 	ext{ in} = 2.54 	ext{ cm}$$

Question 13

A student needs to convert 25.0 $$^\circC to $$Fahrenheit. Which formula should they use?

Accepted Answer

$$^\circ F = \frac{9}{5} 	imes ^\circ C + 32$$

Question 14

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Vinegar (acetic acid in water)

Question 15

Which of the following best describes the difference between precision and accuracy?

Accepted Answer

Precision refers to how close repeated measurements are to each other; accuracy refers to how close measurements are to the true value.

Question 16

Which of the following is the correct SI unit for mass?

Accepted Answer

Kilogram (kg)

Question 17

A student is asked to classify a sample of air. Which of the following best describes air?

Accepted Answer

A homogeneous mixture

Question 18

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

Accepted Answer

The result should have the same number of significant figures as the measurement with the fewest significant figures.

Question 19

Which of the following is NOT a correct example of a physical change?

Accepted Answer

Burning of sulfur powder

Question 20

Which of the following best describes the symbolic domain in chemistry?

Accepted Answer

It uses specialized language and symbols to represent aspects of the microscopic and macroscopic domains.

Foundations of General Chemistry: Matter, Measurement, and Properties

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