Chemical Changes

What is a physical change?

• A change where new substances are formed

• A change where no new substances are formed

• Combustion

• Oxidation

An example of a physical change is

• Oxidation

• Combustion

• Freezing

• Thermal Decomposition

What is a chemical change?

• A change in which new substances are formed

• A change in which no new substances are formed

• Boiling

• Dissolving salt in water

Can chemical changes be easily reversed?

• Yes

• No

A large amount of heat energy is released when carbon burns. This is a ______________.

• Chemical change

• Physical change

In a chemical change, substances that react with each other are called:

• Products

• Atoms

• Reactants

• Elements

New substances formed in chemical reactions are called:

• Reactants

• Elements

• Atoms

• Products

Carbon burns in oxygen to produce:

• Hydrogen gas and water

• Carbon dioxide and water

• Carbon dioxide

• Water

Calcium carbonate undergoes thermal decomposition to produce:

• Carbon dioxide and water

• Calcium oxide

• Carbon dioxide

• Calcium oxide and carbon dioxide

Chemical Changes can be reversed with separation techniques (e.g., filtration)

• Yes

• No