Before you start you can look back at .
If you only remember one thing:
This is the twelfth of the 14 Chemistry units:
C5. Electricity and Chemistry
C6. Energy Changes in Chemical Reactions
C7. Chemical Reactions
C8. Acids, Bases and Salts
C9. The PeriodicTable
C11. Air and Water
C14. Organic Chemistry
THE CONTACT PROCESS
Choose one of the videos below to help you answer the questions.
You might need to research the answer to the last question.