Question 1

Which of the following best describes the difference between a physical change and a chemical change?

Accepted Answer

A physical change alters the form of matter without changing its chemical identity, while a chemical change transforms matter into new substances.

Question 2

Which statement about the scientific process is correct?

Accepted Answer

A hypothesis becomes a theory after being supported by many experiments.

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

The ability of iron to react with oxygen to form rust.

Question 4

A sample of galena (lead sulfide) weighs 12.4 g and has a volume of 1.64 cm$$^3. $$What is its density?

Accepted Answer

$$d = \frac{12.4\,\mathrm{g}}{1.64\,\mathrm{cm}^3} = 7.56\,\mathrm{g/cm}^3$$

Question 5

Which of the following is an extensive property?

Accepted Answer

Mass

Question 6

Which area of chemistry focuses on the study of matter containing only carbon and hydrogen?

Accepted Answer

Organic Chemistry

Question 7

A student measures the length of a table three times and gets values of 2.01 m, 2.00 m, and 2.02 m. The actual length is 2.50 m. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 8

Which of the following is a correct conversion from Celsius to Kelvin?

Accepted Answer

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

Question 9

Which statement about significant figures is true?

Accepted Answer

Zeros to the right of the decimal after a nonzero digit are significant.

Question 10

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water.

Question 11

A chemist wants to convert 20 yards to feet. Which conversion factor should be used?

Accepted Answer

$$\frac{3\,\mathrm{feet}}{1\,\mathrm{yard}}$$

Question 12

Which of the following is NOT an SI base unit?

Accepted Answer

Liter

Question 13

A student multiplies 2.5 (2 significant figures) by 3.6666 (5 significant figures). How many significant figures should the result have?

Accepted Answer

2

Question 14

Which of the following is an example of a compound?

Accepted Answer

Water (H$$_2O)$$

Question 15

Which SI prefix represents $$10^{-6}$$?

Accepted Answer

Micro

Question 16

Which of the following statements about exact numbers is correct?

Accepted Answer

Exact numbers have no effect on significant figures in a calculation.

Question 17

Which of the following is a derived SI unit?

Accepted Answer

Meter per second

Question 18

A mixture of iron filings and potassium dichromate can be separated by:

Accepted Answer

Using a magnet

Question 19

Which of the following best describes a solid?

Accepted Answer

A form of matter that is relatively incompressible and has a fixed shape and volume.

Question 20

Which of the following is the correct formula for density?

Accepted Answer

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

Chapter 1: Chemistry and Measurement – Foundational Concepts and Methods

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