Law of conservation of mass

Front

What is the Law of Conservation of Mass?

Back

Mass is never created or destroyed.

Front

If Bob puts 200 grams of ice into a pitcher with 900 grams of water, how many grams of water does he have after the ice melts?

Back

1,100 g

Front

In a reaction A + B --> C, if reactant A has 5g and product C has 9g, how many grams does reactant B have?

Back

4g

Front

If a reaction starts with a total of 75g of reactants, what should the total mass of products be?

Back

75g of products.

Front

What happens to the total mass of substances in a closed system during a chemical reaction?

Back

The total mass remains constant.

Front

Define reactants in a chemical reaction.

Back

Reactants are the starting substances that undergo a chemical change.

Front

Define products in a chemical reaction.

Back

Products are the substances formed as a result of a chemical reaction.

Front

What is an example of a physical change?

Back

Melting ice is a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change.

Front

How does the Law of Conservation of Mass apply to cooking?

Back

The total mass of ingredients before cooking equals the total mass of the dish after cooking.