Properties of Matter and Materials

Front

What does the Law of Conservation of Mass state?

Back

The Law of Conservation of Mass states that mass is neither created nor destroyed in a chemical reaction; it only changes forms.

Front

What happens to wood and oxygen when they are burned?

Back

The atoms in the wood and oxygen rearrange and form smoke and ash.

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.

Front

Give an example of a physical change.

Back

Bending, chopping, and breaking are examples of physical changes.

Front

What is a chemical change?

Back

A chemical change is a change that produces one or more new substances with different properties.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change.

Front

If a reaction starts with 20g of reactants, how much should it produce?

Back

It should produce a total of 20g of products, according to the Law of Conservation of Mass.

Front

What is the mass of coal present at the start of a chemical change if it is 100g?

Back

100g of coal is present at the start of the chemical change.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not produce new substances, while a chemical change does.

Front

What happens to the mass of reactants during a chemical reaction?

Back

The mass of the reactants remains the same as the mass of the products.