Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

How does the weight of a closed container of water change when it freezes?

Back

The weight of the closed container of water remains the same before and after freezing.

Front

What happens to the mass of ice when it melts?

Back

The mass of the ice remains the same when it melts; it just changes from solid to liquid.

Front

If you have 20 grams of a liquid, what will be the mass of the frozen sample?

Back

The mass of the frozen sample will still be 20 grams.

Front

What is an example of a closed system in terms of mass conservation?

Back

A closed container with a lid that holds water and ice is an example of a closed system where mass is conserved.

Front

What happens to the total weight of a mixture when substances are combined?

Back

The total weight of the mixture is equal to the sum of the weights of the individual substances.

Front

If you add 5 ounces of candy to 20 ounces of soda, what is the total weight of the mixture?

Back

The total weight of the mixture will be 25 ounces.

Front

What is the effect of temperature on the state of matter?

Back

Temperature can change the state of matter; for example, heating ice turns it into water.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change where the state changes but the mass remains the same.

Front

How does evaporation affect mass in an open system?

Back

In an open system, evaporation can lead to a loss of mass as the liquid turns into vapor.