Question 1

Which of the following best describes an alloy such as brass?

Accepted Answer

A homogeneous mixture of metals

Question 2

A student is given a sample of 14K gold jewelry. Which statement about this sample is correct?

Accepted Answer

It is a mixture because it contains gold and other metals physically combined

Question 3

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

Accepted Answer

Density

Question 4

A sample of lead has a mass of 22.7 g and a volume of 2.0 cm³. What is its density?

Accepted Answer

11.4 g/cm³

Question 5

Which process is an example of a chemical change?

Accepted Answer

Electrolysis of water to produce hydrogen and oxygen gases

Question 6

Which separation technique would be most effective for separating a mixture of sand and iron filings?

Accepted Answer

Using a magnet

Question 7

A solid cylinder has a radius of 1.8 cm, a height of 1.5 cm, and a mass of 119.5 g. What is its density? (Use π ≈ 3.14)

Accepted Answer

7.85 g/cm³

Question 8

Which of the following statements about compounds is correct?

Accepted Answer

Compounds have properties different from the elements that compose them

Question 9

How many atoms are present in 0.68 moles of zinc?

Accepted Answer

4.1 × 10²³ atoms

Question 10

Which of the following is a correct example of an allotrope?

Accepted Answer

O₂ and O₃ (oxygen gas and ozone)

Question 11

A rectangular solid has edge lengths 8.2 cm, 5.1 cm, and 4.7 cm. If its mass is 153 g, will it sink or float in water at 4°C?

Accepted Answer

It will sink because its density is greater than water

Question 12

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 13

Which change of state is endothermic?

Accepted Answer

Sublimation

Question 14

Which property would be most useful for separating a mixture of oil and water?

Accepted Answer

Density

Question 15

How many grams are in 5.69 moles of uranium (atomic mass ≈ 238 g/mol)?

Accepted Answer

1,354 g

Question 16

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with water

Question 17

Which statement best explains why water is considered a compound?

Accepted Answer

It contains two different types of atoms chemically bonded

Question 18

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

Accepted Answer

Muddy water

Question 19

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed

Question 20

A sample contains 2.65 × 10²³ atoms of neon. How many grams of neon does this sample contain? (Atomic mass of Ne ≈ 20.2 g/mol)

Accepted Answer

8.9 g

Introduction to Matter, Classification, and Basic Quantitative Concepts in Chemistry

Study Guide - Practice Questions