Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A blend of two or more pure substances with uniform composition at the microscopic level.

Question 2

Which of the following is a pure substance?

Accepted Answer

Sodium chloride (NaCl)

Question 3

Apple juice is best classified as which type of matter?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following statements about compounds is correct?

Accepted Answer

Compounds are pure substances that can be separated into simpler substances by chemical means.

Question 5

A sample of steel is best classified as which of the following?

Accepted Answer

Homogeneous mixture

Question 6

Which of the following is NOT a property of metals?

Accepted Answer

Poor conductor of heat and electricity

Question 7

How many hydrogen atoms are present in one molecule of caffeine, $$\mathrm{C_8H_{10}N_4O_2}$$?

Accepted Answer

$$10$$

Question 8

Which of the following best describes an element?

Accepted Answer

A fundamental substance that cannot be broken down into any simpler substance by chemical means.

Question 9

Sucrose (table sugar) is best classified as which of the following?

Accepted Answer

Compound

Question 10

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

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 11

A sample of copper is best described as:

Accepted Answer

An element

Question 12

Which of the following statements is true about mixtures?

Accepted Answer

Mixtures can be separated into their components by physical means.

Question 13

Which of the following is a correct chemical formula for a compound containing 12 carbon atoms, 22 hydrogen atoms, and 11 oxygen atoms?

Accepted Answer

$$\mathrm{C$$_{12}$$H_{22}O$$_{11}}$

Question 14

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound has elements chemically combined in a fixed ratio, while a mixture contains substances physically combined in any ratio.

Question 15

Which of the following is a property of nonmetals?

Accepted Answer

Poor conductor of heat and electricity

Question 16

A saline solution used in hospitals is best classified as which of the following?

Accepted Answer

Homogeneous mixture

Question 17

Which of the following is the correct way to represent an element symbol?

Accepted Answer

With one or two letters, the first capitalized and the second lowercase (e.g., Na, H)

Question 18

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A blend of two or more pure substances with non-uniform composition.

Question 19

Which of the following is a real-life example of a compound?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 20

A student is given a clear, colorless liquid. After evaporating the liquid, a white solid remains. Which classification best fits the original liquid?

Accepted Answer

Homogeneous mixture

Classifying Matter: Pure Substances, Mixtures, and Elements in GOB Chemistry

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