Unit 1: Energy & Matter

Front

What type of change is dissolving salt into water?

Back

Physical change

Front

CH₂ is an example of a —

Back

Chemical formula

Front

Which is NOT a chemical change?

Back

Ice Melting

Front

A change in a substance that does not involve a change in the identity of the substance is called a —

Back

Physical change

Front

The formula for glucose is C₆H₁₂O₆. How many atoms of Hydrogen does glucose contain?

Back

12

Front

What is a physical change?

Back

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 change that results in the formation of new chemical substances.

Front

Give an example of a chemical change.

Back

Iron rusting.

Front

What is a chemical formula?

Back

A way of expressing information about the proportions of atoms that constitute a particular chemical compound.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not change the substance's identity, while a chemical change does.