Question 1

Which of the following is NOT considered matter?

Accepted Answer

Sunlight

Question 2

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements combined in definite proportions

Question 3

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

Accepted Answer

Salt water

Question 4

Which of the following is a physical property?

Accepted Answer

Melting point

Question 5

A student mixes iron filings and sulfur powder. Which type of matter is formed?

Accepted Answer

A heterogeneous mixture

Question 6

Which of the following statements about elements is correct?

Accepted Answer

Elements are substances that cannot be broken down into simpler substances by chemical reactions.

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning wood

Question 8

Which of the following best describes the Law of Constant Composition?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 9

Which of the following is a pure substance?

Accepted Answer

Table salt (NaCl)

Question 10

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 11

Which of the following best describes a molecule?

Accepted Answer

A group of two or more atoms bonded together

Question 12

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

Accepted Answer

Potting soil

Question 13

Which of the following is NOT a physical state of matter?

Accepted Answer

Energy

Question 14

Which of the following is a property of metals?

Accepted Answer

Luster and ability to conduct electricity

Question 15

Which of the following is an example of a compound?

Accepted Answer

Water (H$$_2O)$$

Question 16

Which of the following processes is a physical change?

Accepted Answer

Melting of ice

Question 17

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture with varying properties and different compositions

Question 18

Which of the following is a correct statement about atoms?

Accepted Answer

Atoms are the smallest unit of an element that retains the chemical properties of that element.

Question 19

Which of the following is an example of a chemical change with real-world relevance?

Accepted Answer

Burning wood in a fireplace

Question 20

A sample of air contains 78% nitrogen, 21% oxygen, and 1% other gases. Which classification best describes air?

Accepted Answer

Homogeneous mixture

Chapter 1: Matter and Energy – Foundations of Chemistry

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