1. National 3 Chemistry Unit 2 Revision Nature’s Chemistry

2. Chemistry in Society 1 2 3 4 5 6 7 8 9 10 11 12

3. What is the name for a substance that burns to give off energy?
A fuel

4. Name a substance/chemical made from only hydrogen and oxygen atoms.
A hydrocarbon

5. Name the three parts of the fire triangle.
Heat, Fuel and Oxygen

6. What name is given to fuels that come from Oil, Natural gas and Coal?
Fossil Fuels

7. When sulfur dioxide reacts with water in the atmosphere, acid rain is produced. Give one example of a damaging effect of acid rain.
Acidifies soil or
Acidifies lakes or
Damages buildings.

8. Name the gas that is produced when a hydrocarbon fuel is burned in lots of oxygen?
Carbon dioxide

9. What is the test for carbon dioxide gas?
Turns limewater milky/cloudy

10. This substance turns brown iodine solution blue/black.
starch

11. State which substance turns Blue Benedict’ Reagent brick-red/orange
glucose

12. What is the name of the process that converts sugars into alcohol?
fermentation

13. What is the name of the chemicals that make soil “fertile” and help grow lots
of crops?
Fertiliser

14. Name a plant and a useful product that it supplies to humans.
Indigo plant blue dye or
Willow aspirin
Pine timber