Changes in Matter

Front

What is an endothermic reaction?

Back

An endothermic reaction is a process that absorbs heat from its surroundings, resulting in a decrease in temperature.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a process that releases heat to its surroundings, resulting in an increase in temperature.

Front

What does the Law of Conservation of Matter state?

Back

The Law of Conservation of Matter states that the total amount of matter remains the same after it undergoes a change.

Front

What is a molecule?

Back

A molecule is formed when two or more atoms are joined together.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

Give an example of a physical change.

Back

Melting of wax is an example of a physical change.

Front

Give an example of a chemical change.

Back

Rusting of iron is an example of a chemical change.

Front

What happens to the mass of matter during a chemical reaction?

Back

The mass of matter remains the same during a chemical reaction, according to the Law of Conservation of Matter.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded.