Unit 4- Changing Matter

Front

What is the Law of Conservation of Mass?

Back

The Law of Conservation of Mass states that in a chemical reaction, the mass of the reactants is equal to the mass of the products. This means that matter cannot be created or destroyed.

Front

What happens to the mass of reactants and products in a chemical reaction?

Back

The mass of reactants is equal to the mass of products.

Front

How does temperature affect the rate of a chemical reaction?

Back

Increasing temperature generally increases the rate of a chemical reaction.

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances, such as burning wood.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition, such as melting butter.

Front

What are some signs of a chemical change?

Back

Signs of a chemical change include change in color, formation of a precipitate, and production of gas.

Front

Which of the following is NOT a sign of a chemical change?

Back

Change in state is NOT a sign of a chemical change.

Front

What is an example of a chemical reaction?

Back

An example of a chemical reaction is the reaction between vinegar and baking soda.

Front

What is the effect of gas production in a closed container during a chemical reaction?

Back

In a closed container, the mass remains the same despite gas production, due to the Law of Conservation of Mass.

Front

What is an example of a physical change?

Back

Dissolving sugar in water is an example of a physical change.