Chemical Reactions

Front

What is a chemical change?

Back

A chemical change is a process where a substance transforms into a different substance, resulting in the formation of new chemical properties.

Front

How does a chemical change differ from a physical change?

Back

A chemical change creates a new substance, while a physical change does not.

Front

What are some signs that a chemical change has occurred?

Back

Signs include unexpected color change, temperature change, gas production (bubbles), and formation of a precipitate.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change because it transforms into ash and smoke, which are different substances.

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

Can you name a sign that is NOT indicative of a chemical change?

Back

Change in shape is NOT a sign of a chemical change.

Front

What happens to molecules during a chemical change?

Back

During a chemical change, molecules rearrange to form new substances.

Front

What is the role of energy in chemical reactions?

Back

Energy is often absorbed or released during chemical reactions, which can cause temperature changes.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What does it mean when a gas is produced in a reaction?

Back

The production of gas (bubbles) indicates that a chemical reaction has occurred.