10 minutes maximum! Can you do it in 5?
1. The presence of water can be tested for using either anhydrous cobalt(II)chloride or anhydrous copper(II)sulfate. What is the colour change observed if water is present?
  Cobalt(II)chloride Copper(II)sulfate
A Blue to pink White to blue
B Pink to blue Blue to white
C White to blue Blue to pink
D Blue to white White to blue

2. Which of the following test results would determine that a sample of water is pure?

  • A.   It has a pH of 7
  • B.   It has a boiling point of 100°C
  • C.   It has no taste
  • D.   It changes the colour of anhydrous copper(II)sulfate
3. The pie chart shows the approximate percentage of the three most abundant gases in dry air in today’s atmosphere.

 

The gases represented by X, Y and Z are:

 atmosphere gases pie chart
  X Y Z
A oxygen noble gases and CO2 nitrogen
B nitrogen noble gases and CO2 oxygen
C noble gases and CO2 nitrogen nitrogen
D nitrogen oxygen noble gases and CO2

4. The correct word equation for the complete combustion of a hydrocarbon fuel is ..

  • A.  fuel  + oxygen → carbon dioxide  +  water
  • B.  fuel  + oxygen → carbon dioxide  +  hydrogen
  • C.  fuel  + oxygen → carbon monoxide  +  water
  • D.  fuel  + oxygen → carbon monoxide  +  hydrogen

5. Which polluting gas is produced by the decomposition of vegetation and waste gases from
digestion in animals?

  • A. carbon dioxide 
  • B. methane
  • C. sulfur dioxide
  • D. oxides of nitrogen
6. In which process is carbon dioxide NOT formed?

 

 Carbon dioxide molecule

Jacek FH | CC-BY-SA 3.0
  • A.   burning fossil fuels
  • B.   respiration
  • C.   adding acid to marble chips
  • D.   photosynthesis
7. Which of the following pairs of gases are both greenhouse gases?
  • A.   carbon dioxide and nitrogen
  • B.   nitrogen and oxygen
  • C.   oxygen and methane
  • D.   methane  and carbon dioxide

8. How do greenhouse gases contribute to climate change?

  • A.   They absorb the thermal energy coming from the Sun
  • B.   They absorb the thermal energy which is radiated from the Earth’s surface
  • C.   They block ultra violet radiation from the Sun
  • D.   They burn releasing thermal energy

9. Which statement is NOT true?

  • A.   Oxides of nitrogen can be removed from exhaust gases by using a catalytic convertor
  • B.   Sulfur dioxide emissions can be reduced by flue gas desulfurisation using calcium oxide
  • C.  Sulfur dioxide is a main contributor to acid rain
  • D.   Carbon dioxide is formed by the incomplete combustion of carbon containing substances.

10. A student suggests several methods for reducing greenhouse gases in the air:

I. Reducing the use of fossil fuels in society
II. Reduction in livestock farming
III. Using more renewble energy such as solar and wind
 

Which of these are valid methods?

  • A.  I and II
  • B.  I and III
  • C. II and III 
  • D.  I, II and III