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AQA AS Chemistry: 8th June

Reply 20

wednesburywench

2

its been taken off for defo then yey. is that just berylium or the whole of the solubility of group 2 hydroxides etc?

Reply 21

Kiesha

10

I think I've probably spent 1/2 the day revising stuff which isn't even in the spec anymore! And I haven't even started Module 3 yet :|

Reply 22

Scipio

13

show the equations, with conditions of the extraction of Titanium from its metal halide.

Reply 23

Scipio

13

As for revision, about 2 hrs + one past paper, will do one more hour and i'm set (Chemistry is a walk in the park in my opinion).

Reply 24

wednesburywench

2

yea its just soooooooo easy (!!!!!!) take your cockyness somewhere that cares mate!

Reply 25

Frogsofhope

2

wednesburywench

its been taken off for defo then yey. is that just berylium or the whole of the solubility of group 2 hydroxides etc?

Just beryllium you have to know what the others do.

Reply 26

wednesburywench

2

darn it didnt think they wud take the lot off! lol

Reply 27

Twiglet

2

show the equations, with conditions of the extraction of Titanium from its metal halide.

metal halide? do you mean metal oxide?
TiO2 + 2Cl2 + 2C -> TiCl4 + 2CO @900 degrees
TiCl4 + 4Na -> Ti + 4NaCl @1000 degrees and argon atmosphere

1) Give two advantages of using ethanol as a fuel compared with using a petroleum fraction.
2) Write an overall equation for the reaction of fluorine with fluoromethane to form tetrafluoromethane

Reply 28

thefish_uk

OP

14

Pav27

show the equations, with conditions of the extraction of Titanium from its metal halide.

TiCl₄ + 4Na ----> 4NaCl + Ti

550°C, normally done in a steel vessel with an inert argon atmosphere to stop the Ti oxidising again.

List, in order of their melting point, the main fractions of crude oil.

Reply 29

Twiglet

2

List, in order of their melting point, the main fractions of crude oil

LPG
Petroleum
Naptha
Kerosine
Gas Oil
Mineral oil
Fuel oil
Waxes
Bitumen

Reply 30

kiaora

1

Kiesha

Amphoteric = can act as both acid and base.

Base: Be(OH)2 + H2SO4 --> BeSO4 + 2H20

Acid: Be(OH)2 + 2OH- --> Be(OH)₄^2-

thats no longer in the specification.

Reply 31

Frogsofhope

2

Sorry to rain on everyones paarade but these questions are going into far more detial than is on the current specs. like for crude oil fractions you only have to know roughly hjow a fractioanting column works and give an example of 1 fraction u dont have to know thme all in order

Reply 32

Kiesha

10

thefish_uk

TiCl₄ + 4Na ----> 4NaCl + Ti

550°C, normally done in a steel vessel with an inert argon atmosphere to stop the Ti oxidising again.

List, in order of their melting point, the main fractions of crude oil.

Refinery gas
Gasoline
Naptha
Kerosene
Diesel
Lubricating oil (hehe)
Fuel oil
Bitumen

Give the conditions which favour an elimination reaction instead of a nucleophilic substitution.

Reply 33

wednesburywench

2

lpg
petrol
naptha
kerosine
diesel
Mineral oil
fuel oil
Wax
Bitumin

hate remmeberng that. Anyone know if the specs been changed to remove sumat wats been added in its place!! (if anytthing) im worried i wont know something!!

Reply 34

wednesburywench

2

hot ethanolic

Reply 35

Frogsofhope

2

does ANYBODY at all have a markscheem for Jan05 mod 3 i am REALLY despearate for it i need to makr this paper, it was really strange I think compared to the other past papers, the question ""list two general features of an homogous series " was WTF! and what is the advantage of using ethanol as a fuel compared with petroleum?

Reply 36

Kiesha

10

marisad_uk

does ANYBODY at all have a markscheem for Jan05 mod 3 i am REALLY despearate for it i need to makr this paper, it was really strange I think compared to the other past papers, the question ""list two general features of an homogous series " was WTF! and what is the advantage of using ethanol as a fuel compared with petroleum?

I did the exam paper in class. I don't have the exact markscheme but I have got notes on the correct answers. Homologous series = same general formula; same functional group.

Reply 37

Twiglet

2

does ANYBODY at all have a markscheem for Jan05 mod 3 i am REALLY despearate for it i need to makr this paper, it was really strange I think compared to the other past papers, the question ""list two general features of an homogous series " was WTF! and what is the advantage of using ethanol as a fuel compared with petroleum?

yeah, I couldnt really think of the answers to the 2 below, what did you put for them?
For the homologous series I put same general formula and similar chemical properties. COuld really do with the markscheme tho!

1) Give an advantage of using ethanol as a fuel compared with using a petroleum fraction.
2) Write an overall equation for the reaction of fluorine with fluoromethane to form tetrafluoromethane