Question 1

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

Accepted Answer

oxygen gas ($$\mathrm{O_2$})$$

Question 2

Classify the following as either a compound or an element: sodium chloride ($$\mathrm{NaCl}).$$

Accepted Answer

Compound

Question 3

Which of the following is a homogeneous mixture?

Accepted Answer

Salt water

Question 4

A student is given a sample of air and a sample of pure oxygen. Which statement is correct?

Accepted Answer

Air is a mixture; oxygen is a pure substance.

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Blood

Question 6

Classify the following as a pure substance or a mixture: baking soda ($$\mathrm{$$NaHCO_3$$}).$$

Accepted Answer

Pure substance

Question 7

Which of the following is NOT a pure substance?

Accepted Answer

Milk

Question 8

A patient is given a saline IV solution. This solution is best classified as:

Accepted Answer

A homogeneous mixture

Question 9

Which of the following is a compound?

Accepted Answer

Hydrogen peroxide ($$\mathrm{H_2O_2})$$

Question 10

Classify the following as a pure substance or a mixture: cranberry juice.

Accepted Answer

Mixture

Question 11

Which of the following best describes the composition of a muffin?

Accepted Answer

Heterogeneous mixture

Question 12

A thermometer is made of glass and contains mercury. Which of the following best describes mercury in this context?

Accepted Answer

Element

Question 13

Which of the following is a pure substance that is a compound?

Accepted Answer

Table salt ($$\mathrm{NaCl})$$

Question 14

Which of the following is a mixture?

Accepted Answer

Air

Question 15

A nurse mixes sugar into tea for a patient. The resulting solution is best classified as:

Accepted Answer

A homogeneous mixture

Question 16

Which of the following is a pure substance that is an element?

Accepted Answer

Copper (Cu)

Question 17

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 18

A student is given a sample of table sugar ($$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$). How should it be classified?

Accepted Answer

Compound

Question 19

Which of the following is a mixture that is NOT uniform throughout?

Accepted Answer

Vegetable soup

Question 20

Which of the following is a pure substance that can be broken down into simpler substances by chemical means?

Accepted Answer

Table salt ($$\mathrm{NaCl})$$

Classification of Matter: Pure Substances and Mixtures

Study Guide - Practice Questions