AQA IGCSE Chemistry Paper 1 18th May 2017

Original post by Anand3761

Nah it went colourless as magnesium sulfate was formed

yeah thats what i said - the original reaction was between copper sulfate and magnesium
so the copper sulfate is blue
but it gets displaced by magnesium
so it turns colourless.
i didn't explain it but i said it went from blue to colourless.

Reply 82

Original post by jogman5364

I thought it went from light grey- normal mg to colourless?

Reply 83

Original post by Libbythelobster

Wdym double bond? Like adding 2 electrons
Or 4 in that overlap

4 in that overlap

Reply 84

Original post by Anand3761

I thought it went from light grey- normal mg to colourless?

light grey is the colour of the metal though, how can the metal turn colourless
cause it gave the colour of the metal sulfate and the colour of the metal

Reply 85

Original post by jogman5364

light grey is the colour of the metal though, how can the metal turn colourless
cause it gave the colour of the metal sulfate and the colour of the metal

Fgs lost a mark

Two qs-":

Do you know if solids was 1st tick box?

+ what was the one line q in the hydrocarbon question?

Reply 86

Original post by Anand3761

And what was the answers to reactivity series ones ??

Magnesium zinc iron and copper also what did you get about nitrogen oxides I thought it was exo

Reply 87

Original post by Libbythelobster

Magnesium zinc iron and copper also what did you get about nitrogen oxides I thought it was exo

Nah activation energy one
Unlucky
Yh right order

Reply 88

Original post by Libbythelobster

Magnesium zinc iron and copper also what did you get about nitrogen oxides I thought it was exo

i said high activation energy; cause it requires high temperatures to form them.

Reply 89

[QUOTE="jogman5364;71544346"]

Original post by Libbythelobster

you get 1, 1, and 1.5 for the moles
you cant have a H1.5
so you double them
so it gives
C2O2H3

That's where I made a mistake I didn't double number one and I got 3 on its own for hydrogen somehow lol!

Reply 90

Original post by Anand3761

Fgs lost a mark

Two qs-":

Do you know if solids was 1st tick box?

+ what was the one line q in the hydrocarbon question?

i cant remember sorry

Reply 91

Has my ms been posted btw?
Did a few qs just now

Reply 92

Original post by jogman5364

i said high activation energy; cause it requires high temperatures to form them.

Damn how much was that mark and for the water test how much were the marks? What did you get for alloys?

Reply 93

Original post by Libbythelobster

Damn how much was that mark and for the water test how much were the marks? What did you get for alloys?

Give me 3 mins

Reply 94

Original post by Anand3761

Nah activation energy one
Unlucky
Yh right order

Damn Daniel that's annoying I lost like 26 marks what was your definition for equilibrium

Reply 95

I got brown solid colourless solution

Original post by jogman5364

light grey is the colour of the metal though, how can the metal turn colourless
cause it gave the colour of the metal sulfate and the colour of the metal

Reply 96

Original post by Libbythelobster

Damn how much was that mark and for the water test how much were the marks? What did you get for alloys?

ok so that was a tick box
it was worth 1 mark

the water test was worth 2 marks

the alloys;

•

the metal impurities have different sizes and distort the regular arrangement of metal ions

•

this makes the layers more difficult to slide over each other,

•

making it harder.

•

no impurities in pure titanium, so the layers can slide over reach other easily

•

so its softer.

Reply 97

Original post by Libbythelobster

Damn Daniel that's annoying I lost like 26 marks what was your definition for equilibrium

in a closed system, where the rates of the forward and reverse reactions are the same.

Reply 98