What are the orginal substances called in a reaction?
reactants
Why can´t we use a chemical reaction to seperate a new product?
Because the atoms are chemically linked
What is an example of combustion?
fire
Thermal energy, oxygen and ______ can cause a chemical reaction to take place.
Microorganisms
What are the new substances that are made from combustion?
Smoke and ash
Oxidation is a chemical reaction that occurs when a substance reacts with _____
oxygen
When some metals react with oxygen they turn reddish brown. This is called ____
Rust
Name two different foods that oxidise
Fermentation occurs when there is no _____
Oxygen
Fermentation involves _______
Microorganisms
What are the three things needed for combustion?
Oxygen, fuel and heat
