Chemistry Paper 61

[Srhmnir]

what did you right for the first question in which they asked for 2 reasons that sulphuric acid is completely reacted

 

[L-Girl]

i think it was a bit confusing.

 

[Nawaf Dandachi]

IF I GET 50/60 IS IT STILL A*?? IM WORRIED :''''''(

That's hardly an A, you should get let's say 53 or 54 to be on the safe side. It all depends on the curve really.Plus it might be a low A. Paper 6 is just 20% so yeah cheerup. and forget about what happened today.

 

[Nawaf Dandachi]

what did you right for the first question in which they asked for 2 reasons that sulphuric acid is completely reacted

1)No more solid reacts or dissolves.
2)No more fizzing/bobbles is observed. Bobbles will be Hydrogen as Iron displaces the proton in H2204.

 

[ThatReallyReallyWeirdDude]

YOU DON'T SAY? All displacement are Exo. Plus be simple. It's Double Displacement. There is no direct clue for being exo they didn't mention anything about temp.

Actually as far as I know it's only metal+acid displacement reactions which are always exothermic.
The answer is displacement OR precipitation reaction. Exothermic, even if true is an abstract answer not based on physical evidence.

 

[ThatReallyReallyWeirdDude]

That's hardly an A, you should get let's say 53 or 54 to be on the safe side. It all depends on the curve really.Plus it might be a low A. Paper 6 is just 20% so yeah cheerup. and forget about what happened today.

And 50/60 is 86.666 rounding up to 87. If you look at grade thresholds for last year, chem A* was around 67-75, i don't remember.

 

[Nawaf Dandachi]

Actually as far as I know it's only metal+acid displacement reactions which are always exothermic.
The answer is displacement OR precipitation reaction. Exothermic, even if true is an abstract answer not based on physical evidence.

That what I said, They didn't say anything about temp rise. He might have used it in the fules question where they stated temp increase. and No all displacement are Exo. So yeah Double Displacement or Precipitation

 

[Srhmnir]

1)No more solid reacts or dissolves.
2)No more fizzing/bobbles is observed. Bobbles will be Hydrogen as Iron displaces the proton in H2204.

i messed this one !! i worte the first point but i was stupid on the second !!
any way it was for 2 marks !

 

[Srhmnir]

1)No more solid reacts or dissolves.
2)No more fizzing/bobbles is observed. Bobbles will be Hydrogen as Iron displaces the proton in H2204.

anyway thanx

 

[L-Girl]

what was the answer of what could happen if iron sulphate solution was heated?

 

[Nawaf Dandachi]

And 50/60 is 86.666 rounding up to 87. If you look at grade thresholds for last year, chem A* was around 67-75, i don't remember.

We got a badass over here/ how come 75? the Paper 6 is worth 60. Last years May June 2011 grade cruve was 40,40,47

 

[Saadiya Ahmed]

i messed this one !! i worte the first point but i was stupid on the second !!
any way it was for 2 marks !

it was of TWO freakin marks...tht's a lot!!

 

[shalala]

What was solid W?
and what happened by boiling iron sulphate???

 

[Nawaf Dandachi]

what was the answer of what could happen if iron sulphate solution was heated?

That was the only question I invented answers in haha

 

[Nawaf Dandachi]

it was of TWO freakin marks...tht's a lot!!

The Paper 6 Variant 1 curve was of 40/60 . Please.

 

[Nawaf Dandachi]

What was solid W?
and what happened by boiling iron sulphate???

Hahahha It is Ammonium Carbonate, as it releases amonia when heated with NaOH. and they said it's carbonate.

 

[Nawaf Dandachi]

In the qualitative analysis table. about the HCL+W , it's worth 3 marks so say

Bubles and Fix as C02 produced. C02 turn limewater milky

 

[malik sal sal]

sooooooooooooooooooo easy

 

[L-Girl]

sooooooooooooooooooo easy

what happens when the solution of iron sulphate is boiled?

 

[ThatReallyReallyWeirdDude]

We got a badass over here/ how come 75? the Paper 6 is worth 60. Last years May June 2011 grade cruve was 40,40,47

We got a badass over here?
This isn't some sort of war
I'm talking overall mark. 75 PERCENT.
This is the grade threshold for last year
If you look, the total A* percentage for paper 1/3/6 combination is from 67% to 70%
And for paper 6 A*was from 40 to 47 out of 60.
So you're most likely safe, but that was LAST year. I think this year's paper 6 was trickier than last year so it may be lower! Don't worry, there's nothing you can change now anyway so just focus on papers 1 and 3.
Besides losing 10 marks in paper 6 is only ~3.3 percent overall.