Question 1

Which of the following is considered a physical property of a substance?

Accepted Answer

Mass

Question 2

A student measures the volume and mass of a liquid without changing its chemical composition. What type of property is being measured?

Accepted Answer

Physical property

Question 3

Which of the following best describes a chemical property?

Accepted Answer

Ability to undergo a chemical reaction

Question 4

According to the law of conservation of mass, which equation correctly represents a chemical reaction where mass is conserved?

Accepted Answer

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

Question 5

Which scenario best illustrates the law of conservation of mass?

Accepted Answer

Mixing vinegar and baking soda in a sealed container and measuring the total mass before and after the reaction

Question 6

Which of the following is NOT a physical property?

Accepted Answer

Reactivity with acid

Question 7

A sample of iron rusts when exposed to air. This is an example of:

Accepted Answer

A chemical property

Question 8

Matter can be classified based on its composition. Which of the following is a correct classification?

Accepted Answer

Matter can be classified as elements, compounds, and mixtures

Question 9

Which of the following changes is a chemical change?

Accepted Answer

Burning gasoline

Question 10

A student combines two clear solutions and observes the formation of a precipitate. What type of property is being demonstrated?

Accepted Answer

Chemical property

Question 11

Which statement best describes the law of conservation of mass in a closed system?

Accepted Answer

The total mass remains constant during a chemical reaction

Question 12

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

Accepted Answer

Water freezing

Question 13

A mixture of sand and salt can be separated by:

Accepted Answer

Filtration followed by evaporation

Question 14

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more elements chemically combined in fixed proportions

Question 15

If 10 g of hydrogen reacts with 80 g of oxygen to form water, what is the total mass of water produced according to the law of conservation of mass?

Accepted Answer

$$90\ \mathrm{g}$$

Question 16

Which of the following is a chemical property of sodium?

Accepted Answer

It reacts vigorously with water

Question 17

Which process involves a chemical change?

Accepted Answer

Digesting food

Question 18

A student claims that the mass of products in a chemical reaction is greater than the mass of reactants. Which law contradicts this claim?

Accepted Answer

Law of conservation of mass

Question 19

Which of the following is NOT a correct statement about matter?

Accepted Answer

Matter can only exist as a solid

Question 20

Which of the following best explains why the mass of a sealed container remains unchanged after a chemical reaction occurs inside it?

Accepted Answer

The law of conservation of mass states that mass cannot be created or destroyed in a chemical reaction

Basic Concepts of Chemistry: Properties, Classification of Matter, and Laws of Chemical Combination

Study Guide - Practice Questions