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 tear a piece of paper, what happens to its weight?

Back

The weight stays the same, even though the paper is in smaller pieces.

Front

What happens to the weight of a closed container of water after some water evaporates?

Back

The weight of the container remains the same as it was before evaporation.

Front

How do you calculate the total weight of a sandwich made from different ingredients?

Back

Add the weight of each ingredient together. For example, a 1 oz slice of bread with 2 oz of peanut butter and 1 oz of jelly weighs 4 oz in total.

Front

What is the mass of an object after it has been boiled?

Back

The mass remains the same as it was before boiling, assuming no material has been added or removed.

Front

If you add ice cubes to a glass of water, what happens to the total weight after the ice melts?

Back

The total weight of the glass of water will increase by the weight of the ice cubes added.

Front

What is an example of a physical change?

Back

Tearing a piece of paper is a physical change because the paper's mass remains the same.

Front

What is an example of a chemical change?

Back

Burning wood is a chemical change because it transforms the wood into ash and gases, changing its mass.

Front

How does evaporation affect the mass of water in a closed system?

Back

Evaporation does not affect the total mass in a closed system; the mass remains constant.

Front

What is the relationship between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.