Unit 5 Lesson 2: Conservation of Mass

Front

What are substances present at the start of a chemical reaction?

Back

Reactants

Front

What happens to the mass of water when it freezes into ice?

Back

The mass of the ice is the same as the mass of the water.

Front

What is the mass of a 500-gram block of cheese after it is melted?

Back

500 grams, because the cheese does not gain or lose mass just because it was melted.

Front

What does the Law of Conservation of Mass state?

Back

Mass cannot be created nor destroyed, it can only change form.

Front

What do we call the chemicals that result from a chemical reaction?

Back

Products

Front

What is the definition of reactants?

Back

Substances that undergo a chemical change in a reaction.

Front

What is the definition of products in a chemical reaction?

Back

Substances that are formed as a result of a chemical reaction.

Front

What is the significance of the Law of Conservation of Mass in chemical reactions?

Back

It ensures that the total mass of reactants equals the total mass of products.

Front

How does melting affect the mass of a substance?

Back

Melting does not change the mass of a substance.

Front

What is an example of a physical change?

Back

Melting ice is a physical change.