5P22 Matter: Law of 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

If you add 10 grams of water to 5 grams of salt, what is the total mass of the salt water?

Back

15 grams

Front

What happens to the mass of a solution when a solute is dissolved in a solvent?

Back

The mass of the solution is equal to the mass of the solute plus the mass of the solvent.

Front

If 15 grams of sugar are dissolved in 300 grams of water, what is the mass of the mixture?

Back

315 grams

Front

What is an example of a physical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change because it produces new substances (ash, smoke) and the mass changes.

Front

If a rock weighing 60 grams is broken into two pieces, what can be said about the total mass of the pieces?

Back

The total mass of the two pieces will still be 60 grams.

Front

What is the mass of frozen water if 200 grams of water is frozen?

Back

200 grams

Front

What is a solute?

Back

A solute is a substance that is dissolved in a solvent to form a solution.

Front

What is a solvent?

Back

A solvent is a substance that dissolves a solute, forming a solution.