Chemical Reactions

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What is a chemical reaction?

Back

A process where substances (reactants) are transformed into new substances (products) with different properties.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the law of conservation of mass?

Back

In a chemical reaction, the mass of the products is equal to the mass of the reactants.

Tags

NGSS.MS-PS1-5

Front

What is a reactant?

Back

A substance that undergoes change during a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a product?

Back

A substance that is formed as a result of a chemical reaction.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a chemical change?

Back

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

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.

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What is a molecule?

Back

Two or more atoms bonded together.

Tags

NGSS.MS-PS1-1

Front

What is an atom?

Back

The smallest unit of a chemical element, consisting of a nucleus surrounded by electrons.

Tags

NGSS.MS-PS1-1

Front

What is a compound?

Back

A substance formed when two or more different elements are chemically bonded together.

Tags

NGSS.MS-PS1-1

Front

What is a mixture?

Back

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