5.P.2.2 Flashcard (Conservation of Mass)

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that the total mass of the reactants will always equal the total mass of the products in a chemical reaction.

Front

If a reaction starts with 20g of reactants, how much mass will the products have?

Back

The products will have a total mass of 20g.

Front

What happens to the mass of a substance when it changes state, like melting?

Back

The mass remains the same; it does not gain or lose mass just because it changes state.

Front

What is an example of a physical change?

Back

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

Front

If 500 grams of water freezes, what is the mass of the ice formed?

Back

The mass of the ice is the same as the mass of the water, which is 500 grams.

Front

Does heating a gas inside a balloon change its mass?

Back

No, the mass of the gas inside the balloon stays the same even if the temperature increases.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

Can mass be created or destroyed in a chemical reaction?

Back

No, mass cannot be created or destroyed; it can only change forms.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change where new substances are formed.