1. Types of Chemical Change
Oxidation
Combustion
Cellular Respiration
Photosynthesis

2. Oxidation Materials oxidize when they react with oxygen in the air
Rusting (corrosion) is a form of oxidation
Iron in air will form iron oxide (rust)
Fe + O2  FeO2 (iron oxide)

3. Presence of air, light, water and salt can accelerate oxidation

4. Iron Oxide (Rust)

5. Copper Oxide

6. To prevent or slow oxidation…
Galvanize the metal (coat in Zinc)
Oil coating
Rust proofing
Water proofing
Add preservatives to food which may oxidize

7. Combustion A form of oxidation that releases a large amount of energy
Burning wood, cellular respiration
Burning fossil fuels
Principal of the “internal combustion engine”

8. Internal Combustion Engine

9. 3 conditions to promote combustion
Fuel (wood, propane, oil, gas etc.)
Oxidizing agent: causes the fuel to react (oxygen in the air is most common)
Ignition temperature: minimum temperature which combustion starts. Different for each type of fuel.

10. Triangle of Fire

11. 3 types of combustion Rapid: fire, explosion, car engine
Spontaneous: ignites without any outside energy source (eg: some forest fires, oil coated rags)
Slow: decomposition, fermentation, metal corrosion

12. Cellular Respiration
A chemical change in which glucose (sugar) and oxygen are used to generate energy
Essential to life
A form of slow combustion
Allows organisms to survive and function

13. Glucose + oxygen  carbon dioxide + water + energy

14. Photosynthesis
Chemical change that produces glucose and oxygen from solar energy, carbon dioxide and water
Essential for plant growth and human survival

16. Photosynthesis