AQA GCSE Chemistry C1 Exam 10th June 2014

So how does that work?

This should help you. However, I don't think you need to know the process; just what it is.

umm... what should help me? Did you mean to attach something?

Would I be correct (for 1/2 marks) in saying:

"Bio-leaching is a method of extracting a higher quality solution from a low grade ore using bacteria. The metal is the extracted from the solution using conventional means."

Or would it be expected to describe how the bacteria extract it (which I don't know, I would assume they ingest the rock somehow and produce high metal conc. waste).

Does anyone know the topics which are most likely to come up tomorrow

2) So how do you tell it apart from saturated fats? If neither decolourise it then it's not a very good test

4) Thanks! Makes sense

5) Didn't know this was copper specific, I think it's being done with some other metals as well (maybe experimentally atm?) But yeah, price of copper is going up so it's a good example for both bio-l and phyto-m.

You turn!

1) Give an advantage of forming ethanol through fermentation

2) Give an advantage of forming ethanol through the hydration of a hydrocarbon, and name the hydrocarbon.

3) Who was Wegener?

4) Why is aluminium more expensive than iron (for this assume that Al is either more or equally abundant as Fe, which I think is true)

Hi, can someone explain the miller Urey experiment for me please?i really don't get it

1) An advantage could be that it is environmentally friendly in other words it is carbon neutral, so it takes in the same amount of carbon it gives out?

2) An advantage could be it is cheaper than other methods? The hydrocarbon would be Ethane ?

3) Wegner was the person who came up with the idea of continental drift, the main evidence he gave was something called Pangea which means all lands I think, this was one big continent, but it was not accepted by other scientisits at the time because he was just a teacher and not a well know scientist, plus the theory of a land bridge between south America and Africa was widley accepted by the other scientist

4) this is because you have to put aluminium through electrolysis? But you don't have to put iron through electrolysis, is this something to do with higher grade ores of aluminium ?

No problem friend !!!


They were two American scientists who did the experiment in 1952 but was released in 1953

They sealed a mixture of; water , ammonia, methane, and hydrogen. But they heated the water to produce water vapour. They left it for a couple of days, while zapping it with an electric current to simulate lightning

Why was it not successful?


It was not successful because they wanted to produce a life form but instead they produced amino acids

why did they only produce amino acids??

As oxygen was present in the water, so this was not avliable at the start of earths early atmosphere so it was not complete evidence I think


Try making that shorter to help you to take it in, i.e mindmaps or whatever

Will

Pretty much correct on all counts. Hydration of ethane is cheaper (amongst other reasons) because it can be done continuously, unlike fermentation. Electrolysis makes aluminium expensive because of its high energy costs, iron can be reduced using carbon because its less reactive, so is cheaper.

Thank you so much! I'm so nervous for this exam tomorrow

Aw you will be fine, and that's coming from some random guy on the web!
a little happy face for good luck there, not that you need it


TOP tip:


Just write the correct answer and you will be fine !

Um, can anyone go over polymers? What do we need to know about them? Thank you so much

Hey does anyone have any ideas what a 6 mark question could be for this paper.

I personally think that something to do wit polymers or biodiesel i.e how its made -

Will

The percentage of carbon dioxide in the Earth’s atmosphere has changed.
Give two reasons why.

What are the main steps needed to obtain pure ethanol from the mixture produced after
three days?

Many scientists are concerned about the carbon dioxide released from burning fossil
fuels such as petrol.

Governments and people often ignore scientists’ predictions of an earthquake.
Suggest three reasons why.