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 mix 10 ounces of liquid A with 15 ounces of liquid B, what is the total mass of the mixture?

Back

25 ounces (10 ounces + 15 ounces = 25 ounces).

Front

What happens to the mass of a substance when it changes state (e.g., solid to liquid)?

Back

The mass remains the same; it only changes form.

Front

What is an example of a closed system in an experiment?

Back

A closed container where no mass can enter or leave, such as a sealed soda bottle.

Front

How does freezing water affect its mass?

Back

Freezing water does not change its mass; it remains the same before and after freezing.

Front

What is the total weight of a closed container with 5 ounces of liquid and 3 ounces of solid?

Back

8 ounces (5 ounces + 3 ounces = 8 ounces).

Front

If an ice cube melts in a glass of water, what happens to the total weight?

Back

The total weight remains the same before and after the ice melts.

Front

What is the mass of 20 grams of a substance after it is dissolved in water?

Back

The mass remains 20 grams; it does not change when dissolved.

Front

What is an example of a physical change?

Back

Melting ice is a physical change; the ice changes state but its mass remains the same.

Front

What happens to the weight of a closed container when a chemical reaction occurs inside it?

Back

The weight of the closed container remains the same before and after the reaction.