Question 1

Which of the following is an example of a physical property?

Accepted Answer

Density

Question 2

A property that can only be observed by changing the chemical composition of a substance is called:

Accepted Answer

Chemical property

Question 3

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties

Question 4

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 5

According to the Law of Conservation of Mass, which equation is correct for a chemical reaction?

Accepted Answer

$$m_{reactants} = m_{products}$$

Question 6

Which of the following is a pure substance?

Accepted Answer

Oxygen gas

Question 7

Which statement best explains why burning wood is a chemical change?

Accepted Answer

It produces new substances such as ash and gases

Question 8

Which of the following is NOT a chemical property?

Accepted Answer

Melting point

Question 9

A student mixes iron filings and sulfur powder. Which classification best describes the resulting material?

Accepted Answer

Heterogeneous mixture

Question 10

Which of the following best illustrates the Law of Conservation of Mass in a real-world scenario?

Accepted Answer

Burning magnesium ribbon in air and finding the total mass of magnesium and oxygen equals the mass of magnesium oxide formed

Question 11

Which of the following is a compound?

Accepted Answer

Water

Question 12

Which process involves only a physical change?

Accepted Answer

Boiling of water

Question 13

Which of the following is true about elements?

Accepted Answer

They are pure substances consisting of only one type of atom

Question 14

A solution of salt in water is best classified as:

Accepted Answer

Homogeneous mixture

Question 15

Which of the following statements about compounds is correct?

Accepted Answer

They have a fixed ratio of elements

Fundamental Concepts in General Chemistry: Properties, Classification of Matter, and Laws of Combination

Study Guide - Practice Questions