Physical and Chemical Changes

Front

What does the Law of Conservation of Mass state?

Back

Mass cannot be created nor destroyed in a chemical reaction.

Tags

NGSS.MS-PS1-5

Front

What are elements?

Back

Pure substances that cannot be broken down into other substances.

Front

What occurs when Hydrogen and Oxygen combine to form water?

Back

A chemical reaction occurs.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

In a chemical equation, what is a product?

Back

A substance that is produced in a chemical reaction, e.g., Fe2O3.

Tags

NGSS.MS-PS1-5

Front

What does it indicate when light and heat are produced during a reaction?

Back

It is evidence that molecules may be breaking apart in a chemical reaction.

Tags

NGSS.MS-PS1-2

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.

Tags

NGSS.MS-PS1-2

Front

Give an example of a physical change.

Back

Melting ice into water.

Tags

NGSS.MS-PS1-4

Front

Give an example of a chemical change.

Back

Burning wood to produce ash and smoke.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a reactant?

Back

A substance that is present at the start of a chemical reaction.