Explain why the student who had a liebig condenser collected a larger volume of sea water than the student without the condenser
Less steam condenses
As condensing is less efficient
As a liebig condenser is not used
Suggest why water obtained by distillation does not require sterilisation
Distilled water is pure
Explain how potable is produced from fresh water
Choose a fresh water source like rivers
Pass through filter beds
Removes undissolved solids
Sterilise using chlorine which destroys harmful microbes
Suggest two reasons why the proportion of processed solid sewage sludge used as fertiliser increased
Increased demand for food
Conserves energy
Two renewable sources of methane
Animal waste
Food in landfill
Explain why it is more difficult to produce drinking water from waste water than from water in lakes
Water needs more processes
As it contains more organic matter and more microbes
How could the water be tested to show it is pure
Determine boiling point
Should be at a fixed temperature at 100 Celsius
Which two processes are used to make ceramic plates
Heating in a furnace
Shaping wet clay
Suggest two pieces of energy usage which would help to produce a complete LCA for food plate materials
Energy used in extraction of raw materials
Energy used in processing of raw materials
Suggest two reasons why surfboards are coated
Makes them strong
Makes them waterproof
