8.6E Law of Conservation of Mass(8.5E)

Front

What is the law of conservation of mass?

Back

Within a closed system, mass does not change.

Front

What is an example of a chemical change?

Back

A copper penny turning greenish after a few years.

Front

Which model of a chemical reaction best represents the Law of Conservation of Mass?

Back

Model A.

Front

Which is NOT an example of chemical change?

Back

Change in size.

Front

How many grams of OXYGEN would be needed to show conservation of mass in a reaction?

Back

7 g.

Front

Define 'chemical change'.

Back

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

Front

Define 'physical change'.

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What happens to mass in a closed system during a chemical reaction?

Back

The total mass remains constant.

Front

What is an example of a system that exchanges matter and energy?

Back

An open system, like a boiling pot of water.