Conservation of Mass

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction. The total mass of the reactants equals the total mass of the products.

Front

Does the mass of an object change when it is heated?

Back

No, the mass of an object does not change when it is heated. The particles may move faster and spread out, but the total mass remains the same.

Front

What happens to the mass of ice when it melts into water?

Back

The mass of ice remains the same when it melts into water. If you start with 100 grams of ice, you will have 100 grams of water.

Front

If a closed container of water is heated, what happens to the mass of the container?

Back

The mass of the closed container remains the same, even if some water evaporates, because the system is closed and no mass is lost.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change. The ice changes from solid to liquid, but its mass remains the same.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change. The wood transforms into ash and gases, and the total mass changes because some mass is released into the air.

Front

How can you measure the mass of a gas?

Back

You can measure the mass of a gas by capturing it in a closed container and weighing the container before and after.

Front

What happens to the mass of a boiled egg?

Back

The mass of a boiled egg remains the same as it was before boiling, assuming no parts are lost during the process.

Front

What is evaporation?

Back

Evaporation is the process where liquid water turns into water vapor. The mass of the water remains the same in a closed system.

Front

Why does a balloon filled with air not change mass when it is warmed?

Back

The mass of the balloon does not change when warmed because the amount of air inside remains the same, even though the air expands.