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 120 grams of ice melts into water, what is the mass of the water?

Back

120 grams

Front

How do you calculate the mass of a mixture?

Back

To calculate the mass of a mixture, add the masses of all individual components together.

Front

What happens to the mass of substances during a chemical reaction?

Back

The total mass of substances remains constant; it does not change.

Front

If a student makes 250 grams of lemonade using 50 grams of sugar and 25 grams of lemon juice, how much water was used?

Back

175 grams

Front

What is an example of a physical change?

Back

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

Front

What is an example of a chemical change?

Back

Mixing baking soda and vinegar produces carbon dioxide gas, which is a chemical change.

Front

If Substance A has a mass of 50 grams and Substance B has a mass of 50 grams, what is the total mass when they are mixed?

Back

100 grams (before any reaction occurs).

Front

What is the mass of Substance D if Substance A and B produce Substance C with a mass of 60 grams?

Back

40 grams (mass of A + B = mass of C + D).

Front

What is the total mass of a glass containing 300 mL of water and 50 grams of ice cubes after the ice melts?

Back

350 grams.