Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances with different properties.

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

List three indicators of a chemical change.

Back

1. Change in temperature 2. Color change 3. Production of gas (bubbles)

Front

What happens to the molecules during a chemical change?

Back

The bonds between atoms are broken and new bonds are formed, resulting in new substances.

Front

What happens to the molecules during a physical change?

Back

The arrangement of molecules may change, but the molecules themselves remain the same.

Front

Is melting ice a chemical change? Why or why not?

Back

No, melting ice is a physical change because water and ice are made of the same molecules.

Front

What is an example of a chemical change in cooking?

Back

Baking dough to form a crust is a chemical change because new substances are formed.

Front

What is an example of a physical change?

Back

Breaking a glass or melting ice are examples of physical changes.

Front

How can temperature change indicate a chemical change?

Back

A temperature change can indicate a chemical change because it often occurs when new substances are formed, releasing or absorbing energy.

Front

What is the difference between a reversible and irreversible change?

Back

Reversible changes can be undone (like freezing and melting), while irreversible changes cannot be easily reversed (like baking a cake).