Question 1

Which of the following best describes a compound?

Accepted Answer

A substance formed when two or more different elements combine in a fixed pattern.

Question 2

Which process is an example of a chemical change?

Accepted Answer

Rusting of iron.

Question 3

A student mixes sand and iron filings. What type of mixture is formed?

Accepted Answer

Heterogeneous mixture

Question 4

Which of the following is a physical property?

Accepted Answer

Melting point

Question 5

Which statement about pure substances is correct?

Accepted Answer

They contain only one type of matter.

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Vinegar

Question 7

Which of the following is NOT a chemical property?

Accepted Answer

Density

Question 8

Which of the following changes is easiest to reverse?

Accepted Answer

Melting ice

Question 9

A sample of salt water is heated until all the water evaporates, leaving salt behind. What type of change has occurred?

Accepted Answer

Physical change

Question 10

Which of the following best describes the state of matter for a gas?

Accepted Answer

Expands to fill the volume of its container and is easily compressed

Question 11

Which of the following is a correct statement about elements?

Accepted Answer

Elements are the simplest form of matter.

Question 12

Which of the following is a chemical change that occurs in the human body?

Accepted Answer

Digestion of food

Question 13

Which property is used to distinguish between a homogeneous and a heterogeneous mixture?

Accepted Answer

Uniformity of composition throughout the mixture

Question 14

Which of the following is a compound?

Accepted Answer

Water ($$\mathrm{H}_2\mathrm{O})$$

Question 15

Which of the following is a physical change?

Accepted Answer

Freezing water

Question 16

A mixture of salt and water can be separated by which process?

Accepted Answer

Boiling off the water and collecting the salt

Question 17

Which of the following is NOT a pure substance?

Accepted Answer

Salt water

Question 18

Which of the following is a chemical property of matter?

Accepted Answer

Flammability

Question 19

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture that differs in properties from one part to another

Question 20

Which of the following is an example of a thermochemical reaction?

Accepted Answer

Powering a car engine

Chapter 3: Matter and Energy – Introduction to Chemistry Study Notes

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