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"
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.
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.
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? Ifind 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.
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.
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??
Deforestation wont affect the temp of the earth, burning forests will to create land will.
Can someone please explain to me the 6 mark question about polymerisation and the 6 mark question on crude oil fractions. PLEASE HELP
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
Advantage for Hydrogen Fuel - They do not release harmful energy as water isnt harmful also hydrogen is a clean fuel - It isnt polluting - It is renewable Disadvantage for Hydrogen Fuel - There isnt a lot of gas stations that produces hyrdrogen fuel - It is expensive as the extraction method is expensive - It isnt safe as it is flammable - It is hard to store as it has to be stored in containers under high pressure
Advantages for Bio fuels: - It is renewable so we could constantly utilise it - It is less polluting and carbon neutral as the gasses produced from making it is reabsorbed by the (biofuel) plants for photosynthesis
Disadvantage for Bio fuels: - It uses a lot of land meaning they have to cut crops which could increase the prices of the food and there would be a shortage of food, also for making the sites deforestation could occur in order to make these sites - It is not efficient as you need a lot of biofuels for it to be effective - There are not a lot of gas stations where biofuels could be produced
Problems with polymers: - Its non biodegradable meaning they dont get broken down by microorganims so they wont rot meaning they would last for a long time - Also if you burn polymers/plastic it is toxic and could cause many environmental problems
How could we sort this out:
Make it biodegradable so it could rot quicker Recycle and Reuse polymers
HAVENT DONE CORE CHEMISTRY IN 1 YEAR IS THIS CORRECT!!^
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
We made up the mnemonic 'Good Pet Newts Keep Dancing For Biscuits' to remember the fractions Still not as good as B1's 'Kevin, Please Come Over For Gay Sex'