Unit 4 Physical and Chemical Changes

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

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What are physical properties?

Back

Physical properties are characteristics of a substance that can be observed or measured without changing the substance's identity.

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.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, you adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides.

Front

What is an example of a physical change?

Back

Melting ice is an example of a physical change.

Front

What is an example of a chemical change?

Back

Burning wood is an example of a chemical change.

Front

What does it mean for a reaction to be balanced?

Back

A balanced reaction has the same number of each type of atom on both sides of the equation.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a change in a chemical reaction.

Front

What is a product?

Back

A product is a substance that is formed as a result of a chemical reaction.