GCSE edexcel Chemistry-C1

Hydrogen is not a readily available fuel as you must either react steam with a non-renewable energy resource, or use electrolysis to obtain it. Once you have got it, that is even more problematic; as it is a gas, it must be compressed and chilled before being stored, and actually may explode because it's highly flammable.

does anyone know possible questions they could ask on "5.16 Evaluate how far the correlation between global temperature and the proportion of carbon dioxide in the atmosphere provides evidence for climate change"

You'll probably be given a graph & asked to analyse it. There was a 3 marker a few years back that related human population to the outcomes depicted in the graph, and asked something along the lines of:

Suggest, using information from the graph, if the mean average temperature is a result of the increase in human population.

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thanks, do you happen to know what the potential 6-markers on polymers could be?

Im not sure but maybe it might be describe the uses of different polymers

im so freaking nervous what are problems with polymers and any other clues as to what might come up...?

Aw don't be nervous! I'm I the only person scarily relaxed? U find chemistry the easiest

The problems with polymers are they are non biodegradable so they are not easily broken down my microorganisms if they are buried. And if they are buried, some polymers may leak toxic materials in the ground. So then you can burn them to dispose of them, but that's not a good idea because many produce toxic gases when they are burnt. some chemists are developing biodegradable polymers to combat this problem. These are mostly used in agriculture and break down in sunlight, and some contain starch so microorganisms can decompose them. The best way to dispose of polymers is to recycle them though even this requires the polymers to be seperated from each other.

thanks! good luckk

Also, the spec mentions "5.14 Demonstrate an understanding that the Earth’s temperature varies and that human activity may influence this" would this be due to combustion of fossil fuels and deforestation??

Can someone please explain to me the 6 mark question about polymerisation and the 6 mark question on crude oil fractions. PLEASE HELP

I hate polymers that's the only part of c1 I struggle on.


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What happens to haemoglobin in presence of carbon dioxide?

Crude Oil Fractions:
I assume you'd simply list them (preferably in order, from least number of hydrocarbon chains to the most/lowest to highest boiling point/ most viscous to least) and describe their uses ...
Gases (LPG) - cooking & heating
Petrol - fuel in vehicles
Naptha - used as a lighter fuel, and also used in the chemical industry
Kerosene - jet fuel
Diesel - fuels in trains and lorries
Fuel Oil - used as a fuel in large ships and power stations
Bitumen - used to surface roofs/ make roads

C1 exam tomorrow, any predictions for 6 mark questions????