Question 1

Which of the following best describes an atom according to the study materials?

Accepted Answer

The basic unit of matter.

Question 2

Which statement correctly distinguishes between a pure substance and a mixture?

Accepted Answer

Pure substances have fixed composition, while mixtures can be separated physically.

Question 3

Salt water is an example of which type of matter?

Accepted Answer

Mixture

Question 4

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

Accepted Answer

Burning wood

Question 5

Which property does NOT depend on the amount of matter present?

Accepted Answer

Density

Question 6

A student mixes sand and salt in a beaker. Which process can be used to separate them based on their physical properties?

Accepted Answer

Filtration

Question 7

Which of the following is a correct statement about elements?

Accepted Answer

Elements are made of only one kind of atom.

Question 8

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

Accepted Answer

Density

Question 9

A compound is defined as:

Accepted Answer

A substance made of two or more different elements bonded together.

Question 10

Which of the following changes does NOT alter the chemical composition of a substance?

Accepted Answer

Melting ice

Question 11

Which equation correctly represents the calculation of density?

Accepted Answer

$$Density = \frac{Mass}{Volume}$$

Question 12

Which of the following is NOT a pure substance?

Accepted Answer

Salt water

Question 13

Which of the following best describes a physical change?

Accepted Answer

A change that does not change the composition of matter.

Question 14

Which of the following is a real-world example of a mixture?

Accepted Answer

Air

Question 15

A student heats a sample of ice until it melts. What type of change has occurred?

Accepted Answer

Physical change

Question 16

Which of the following statements about chemistry is correct?

Accepted Answer

Chemistry is the study of matter and how it changes.

Question 17

Which of the following is an extensive property?

Accepted Answer

Mass

Question 18

Which process is used to separate a mixture based on differences in boiling points?

Accepted Answer

Distillation

Question 19

Which of the following is a compound?

Accepted Answer

Water ($$H_2O)$$

Question 20

Which of the following best explains why density is an intensive property?

Accepted Answer

Density does not depend on the amount of matter present.

Introduction to General Chemistry: Fundamental Concepts

Study Guide - Practice Questions