| What are two gases used to make ammonia and how is it obtained? | Hydrogen - by reacting methane with steam or cracking hydrocarbons
Nitrogen-from air |
| What are the conditions in the haber process ? | 200 Atmospheres
450 C |
| What is the catalyst used in haber process? | Iron |
| Give three uses of sulfur dioxide | Used as a bleach
Used for wood pulp to make paper
Used as food preservative by killing bacteria |
| What are the raw materials used in contact process? | Sulfur dioxide (obtained from sulfide ores)
Water
Air |
| Give the steps in the contact process and what happens in each step | Sulfur is burned in air to get oxidised to form sulfur dioxide
Sulfur dioxide is mixed with more air with the catalyst vanadium(V) oxide at 450 C for sulfur dioxide to get oxidised and form sulfur trioxide
It is then dissolved in concentrated sulfuric acid to form oleum
It is first mixed with sulfuric acid instead of directly adding to water as if it is added a dangerous mist of acid will form
Oleum is then mixed with water to give concentrated sulfuric acid |
| Give three uses of sulfuric acid | Used in making fertiliser such as ammonium sulfate
Used to make plastics
Used to make soaps and detergents |
| Give two ways of how carbon dioxide is removed from the atmosphere and two ways how it is added to it | Photosynthesis
Dissolving in ocean
Respiration
Combustion of fuel containing |
| Give two sources of methane | Formed when bacteria decomposes plant material in the absence of oxygen
A waste gas from digestion from animals |
| How does carbon dioxide and methane take part in climate change? | Carbon dioxide and methane are both greenhouse gases , which means they absorb heat in the atmosphere and prevent it from escaping resulting in global warming. |
| What are the possible consequences of global warming? | Ice in arctic and antarctica will melt causing a rise in the sea level causing risk to the low lying countries
Species unable to adapt to the climate change will die out
Some places will become much warmer and some places will become much wetter
Draughts might be caused which will result in famines |
| Give the chemical names for each of the substance
Limestone
Lime
Slaked lime
Limewater | Calcium carbonate
Calcium oxide
Calcium hydroxide
Weak solution of calcium hydroxide |
