Chemical Reactions

Front

What is a chemical change?

Back

A process where substances combine or break apart to form new substances, such as burning wood or cooking food.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is a physical change?

Back

A change that does not result in new substances being formed, such as freezing water or melting ice.

Tags

NGSS.MS-PS1-4

Front

What is the law of conservation of mass?

Back

In a chemical reaction, matter is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Tags

NGSS.MS-PS1-5

Front

What is an example of a chemical change?

Back

Burning wood, rusting iron, and cooking food are all examples of chemical changes.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a physical change?

Back

Freezing water, dissolving sugar in water, and breaking a glass are examples of physical changes.

Front

What is a reactant?

Back

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

Tags

NGSS.MS-PS1-2

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 catalyst?

Back

A substance that speeds up a chemical reaction without being consumed in the process.

Tags

NGSS.HS-PS1-5

Front

What is an endothermic reaction?

Back

A reaction that absorbs energy from its surroundings, usually in the form of heat.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What is an exothermic reaction?

Back

A reaction that releases energy to its surroundings, usually in the form of heat.

Tags

NGSS.HS-PS1-4