C1
1) the one with a double bond and only carbon and nitrogen atoms i think it was E cant remember(1 mark)
b) C and F (C4 H10)(1mark)
c) C8 H18(1mark)
d)two brackets, n out side, no double bond displayed formula(1mark)
2)esterd have an oxygen atom(1mark)
b) i guessed 177 degrees idk(1mark)
c) not suitable solvent it cant evaporate (2 marks)
Guessed and said pie chart and line graph(2marks)
3)incomplete would be CH4 + O2 ----> C + 2H2O(2 marks)
4) Carbon cycle
- CO2 doesnt change much cause its recycled in the carbom cycle so even though plants take it in when they did etc it is released
-burning fossil fuels releases it back
-population increase will have negative effect and inceease the pollutants
-more cars so more carbon dioxide myb and nitrogen
-deforestation for land to grow crops
-ozond layer destroyed green house effect
-more burning of fossil fuels
-more use of aerosols
-more acid rain?? (6 marks)
5)Gortex has a membrane with small holes that allows water vapour to escape but too small to let water in. It allows perspiration(2 marks)
b)Gortex is more comfortable(1 mark)
6) oil based paint dries because solvent evaporatesm oil binding medium oxidies to forn hard film/layer(2 marks)
b) in colloid pigment is dispered throughouy mixture but pigmentt/solid particles are too small to dissolve
/seperate.??(2 marks)
Total 25 marks
C2
1)same fossils from continents found there is more evidence to support wegner. It has been tested?(2 marks)
2)oxidation means electrons lost(22mark)
3)amalgam-mercury, brass-copper and zinc, solder -lead and tin (3marks?)
4)aluminium is A because it doesnt rust in damp air.(2marks)
5) iron + oxygen + water----> hydrated iron oxide(2 marks)
6) harber (6 mark)
-350 and 450 i think
They dont use low temp cause slows rate of reaction ammonia made slower
-dont use high presure cause expensive
-They use comprimise temp and pressure
7) potassium nitrate and water (salt and water)(2marks)
8)fertilisers have to be soluble so they can be taken up by roots(1mark)
9)eutrophication (3marks)
-fertilser increase growth of algae
-algae blocks light ..planrs die
-aerobic bacteria feed on dead organisms
-use oxygen up
-aquatic animals larger ones die
Total 23/25 marks- two questions missing or marks wrong
C3
1)?energy i got it wrong (8000j)
B) temp change got it wrong (10 degrees)
2)concentration means crowded increase frequency of collision
3)168---->other numbers add up to 168
4)?
5) rearrange percentage yield equation and it proves it
6)bond making is exothermic bond breaking is endothermic. It is exo because heat given out instead of taken in (3 marks)
7) batch is labour intensive and raw materials used to make drugs is hard get. People tjink unethical and testing banned in some countries (3 marks)
8) chromotography (6marks)
-crush plant
-dissolve with a solvent/ boil
-chromotography w/concentrated solution
-not pure not fixed boiling point
-2 dots
the rate of reaction was 1.5- 1.47