So what did you think of Chemistry?

niamhy101

So how did it go for you all? Thought the experiment qs were nice, if a tad weirdly asked!! The rest of the paper was really nice! overall a lovely paper!!

grimloch

I was nowhere near as prepared as I should have been. They kept asking for two of everything which really caught me out.

Experiments questions looked nice but again, I didn't know enough about the experiments.

shane0312

Yeah brilliant paper.

Did 1,3,4,5,6,9,10 (a+b) ,11 (b+c)

No problems, but I was initially a bit thrown by Soap coming up in question 2 since it came up before. I was sure it was going to be ethanoic acid.
But question 1 easily made up it:D

Just out of interest, what did you get for the picture of the scientist?
I said William Crookes?

nedward

Colorimeter caught me out, as did the water question. Rest of it was reasonable.

abercrombie

shane0312 wrote:

Just out of interest, what did you get for the picture of the scientist?
I said William Crookes?

yeah i said that!!

hmm...i could have been so much more prepared for it! if only i hadn't gone to london at the weekend...!!

tbh i didn't really like the experiments..the 1st one was grand but other two....!:mad: i did questions 1,3,4,5,6,7,10 (a+b), 11 (a+b)! really wanted to do 9 but i never learned the whole mechanism for the bromination of ethene and that part was 12 marks...stupid!!

shane0312

abercrombie wrote:

yeah i said that!!

Well at least someone else said him aswell!

PeadarofAodh

Yeah I got Crookes for the Q4 part.

Didn't like how some of the questions on the soap experiment were phrased but I thought Q1 was really easy and Q4 couldn't have been nicer! Organic questions were also pretty easy for me. All round a very nice paper!:D

Classical studies here I come...

niamhy101

yeah soap qs were kinda weird but i did all three exp qs so i just waffled that one

i said Crookes t'was the only thing i could think of!!

the whole two thing wasn't great, most of mine were waffle (again)

you know for the activation energy q when it asked what Kinetic energy would do and which was more important what did ppl say? was it the speed they gained and the more collisions of the extra general energy over the AE that they got??

Shark-69

Lovely paper......Almost everything i studied this morning and last night came up:D ....Left out all of water and the option Question and still think i got a b1...maybe an A:D ......The Rates of reaction (q7) and Q10 and 11 (both a and b parts) were gems........Q9 was the easiest damn question ive ever done from organic chem....had it done in a matter of minutes............Crookes.........hell yeah:cool: ....What value for X did you get for Q1.....I didnt really know for sure how to find it but still managed to work out an answer.....was X=10

shane0312

Shark-69 wrote:

I didnt really know for sure how to find it but still managed to work out an answer.....was X=10

Yeah thats what I got too!!:D

goodgod3rd

do i dare say what i got for it... i got jj thompson. crooks discoverd cathod rays, but thomson identifyed em as electrons? post mortoms are badddddddddddddd i droped at least 2 grades!!!!

1,2,3,4,6,7,9,10,11

i did the chlorine one in 10 mins.. and messed up the calculationns.

4, 6, 9 were almost orgasmic .. meaning that im a sad chemisry joker....

water of crystalisation buggared me. the calculations were messed up. i got 26% and no X

abercrombie

goodgod3rd wrote:

water of crystalisation buggared me. the calculations were messed up. i got 26% and no X

what was the percentage of water crystallisation??

goodgod3rd

i got 26% and nothing for x (i went backwards )
but the rest of my calss *the whole 3* got sixty something and x = 10

Zoodlebop

goodgod3rd wrote:

do i dare say what i got for it... i got jj thompson. crooks discoverd cathod rays, but thomson identifyed em as electrons? post mortoms are badddddddddddddd i droped at least 2 grades!!!!

1,2,3,4,6,7,9,10,11

i did the chlorine one in 10 mins.. and messed up the calculationns.

4, 6, 9 were almost orgasmic .. meaning that im a sad chemisry joker....

water of crystalisation buggared me. the calculations were messed up. i got 26% and no X

Yes, you do dare say it. I'm pretty sure it was JJ Thompson who identified cathode rays as subatomic particles. Crookes just discovered them with his maltese cross experiment thingy. Besides, Crookes has massive feck-off side whiskers.

I got 62.96% for water of crystalisation and 10 for x.
Anyone else?

brianfiel

No crookes is right.The explanation leans towards thomson but the picture is definitely crookes.Thomson doesnt wear glasses!!!

shane0312

Zoodlebop wrote:

I'm pretty sure it was JJ Thompson who identified cathode rays as subatomic particles. Crookes just discovered them with his maltese cross experiment thingy. Besides, Crookes has massive feck-off side whiskers.

Yeah but Thomson doesnt have a moustache!!

Zoodlebop wrote:

I got 62.96% for water of crystalisation and 10 for x.
Anyone else?

Yeah I got that exactly!

goodgod3rd

my friends , got 10 and 62. yes

and jj dose wear glasses! and a nice stache!

Zoodlebop

I think we're right. This is a picture of JJ off google, exactly the same as the one on the paper, just darker.

JoseJones

how did u get x=10? I got x=2

Faerie

goodgod3rd wrote:

do i dare say what i got for it... i got jj thompson. crooks discoverd cathod rays, but thomson identifyed em as electrons? post mortoms are badddddddddddddd i droped at least 2 grades!!!!

1,2,3,4,6,7,9,10,11

i did the chlorine one in 10 mins.. and messed up the calculationns.

4, 6, 9 were almost orgasmic .. meaning that im a sad chemisry joker....

water of crystalisation buggared me. the calculations were messed up. i got 26% and no X

Yay I got JJ Thompson as well!
Ok paper, Question 1 was probably the easiest chemistry question ever! They asked a couple of weird questions in no 2 but I think (hope!) they were just weirdy phrased. Unortunately q 3 was one of the experiments we left out!

Actually did anyone think q4 was a bit weird? There were no definitions!

Also can anyone tell me the answer to the last part of q4 part B? The one about which metals get oxidised. I never did that section so I randomly picked two metals from the periodic table! I chose Fe and Al.

Brods

they are the 2 metals i guessed aswell... really weird eh?!

curtains

Yes it's thompson, i think.

I wasn't too dying about the 1st experiment but thought that the rest of the aper was lovely. I got 60-something for the percentage and 10 for x too (je ne sais pas).

A few questions...
What is "the general principle of all colorimetry experiments"?
What did everyone get for the heat of combustion one? I got something in the 3000 bracket but i don't think it's right.
and What was the colour change in the MnO4 and I equation in q10? I siad purple to colourless, but again i don't know.

Faerie

Brods wrote:

they are the 2 metals i guessed aswell... really weird eh?!

Freaky....!

Zoodlebop

Faerie wrote:

Yay I got JJ Thompson as well!
Ok paper, Question 1 was probably the easiest chemistry question ever! They asked a couple of weird questions in no 2 but I think (hope!) they were just weirdy phrased. Unortunately q 3 was one of the experiments we left out!

Actually did anyone think q4 was a bit weird? There were no definitions!

Also can anyone tell me the answer to the last part of q4 part B? The one about which metals get oxidised. I never did that section so I randomly picked two metals from the periodic table! I chose Fe and Al.

I'm not to sure about those. Isn't sodium one of them??? And won't iron rust right through, not just on the surface??? I said Cu and Na.

Faerie

curtains wrote:

Yes it's thompson, i think.

I wasn't too dying about the 1st experiment but thought that the rest of the aper was lovely. I got 60-something for the percentage and 10 for x too (je ne sais pas).

A few questions...
What is "the general principle of all colorimetry experiments"?
What did everyone get for the heat of combustion one? I got something in the 3000 bracket but i don't think it's right.
and What was the colour change in the MnO4 and I equation in q10? I siad purple to colourless, but again i don't know.

Yeah I got 62.96% and 10 and I got -3294 for heats of reaction.
I didn't really know the colour change in q10 either but I also said purple to colourless!

Did anyone else get 11.7 for the pH in q4 and 91.3% mass of carbon in methylbenzene? Definately weirdly phrased questions!

Faerie

Zoodlebop wrote:

I'm not to sure about those. Isn't sodium one of them??? And won't iron rust right through, not just on the surface??? I said Cu and Na.

Ah well it was a long shot!!

Brods

11.7 and 91.3 yep... altho i had 90.3 for ages... THEY TRICKED ME, with their methyl group replacing a hydrogen and all....

purple to red-brown?? iodine colour, iodine being the only colour thing on the right hand side...

helles belles

yeah i got those too!

but for the colour change i said purple to colourless to brown

Shark-69

For q11 a did any1 get 0.03 moles for part (iii) and 2.22g for part (v)..? .......I got 91.3% for q4(d) aswell and 11.7 for 4(h).......damn dat picture....I didn't really bother to read the question fully....just saw 'name the scientist' and wrote down Crookes........

curtains

yeah i got 91.3 and 11.7 as well!

yeah, well there iss an argument for that, cause the precipitated iodine would make it brown, in fact i'd say that's right.

btw, as a matter of interest, how soluble are methane, butane and butanol in water?

fatal

it seems like a bollox paper at firsat but it wasnt too bad...only question i didn go near was question 3...SUMMER HOLIDAYS NOW...............;)

Brods

more like life holidays!
and yet im still here....

Zoodlebop

Faerie wrote:

Yeah I got 62.96% and 10 and I got -3294 for heats of reaction.
I didn't really know the colour change in q10 either but I also said purple to colourless!

Did anyone else get 11.7 for the pH in q4 and 91.3% mass of carbon in methylbenzene? Definately weirdly phrased questions!

Yay, I got that exact answer for the heat and the water of crystalisation
I also got 11.7(11.69) for the pH

Would someone got through the methylbenzene calc. I got 90.3%, ye all seem to have got 91.3%.

Feral Mutant

For the activation energy I said that the fact that increased temperature means they collide with greater speed was more important
because if they don't collide fast enough there'll be no reaction no matter how many times they collide.

I waffled so much on that. For the rate of reaction thing, instead of just saying the page had an X on it, I did another drawing of a square with a big X and wrote below "page from above".

d4gurl

I Knew it began with a c william crookes!im so annoyed I knew it was him ****! lovely paper wish i was more prepared If I had worked that bit harder it would of been an A1 not B1 oh well! FINITO!!WOOOOOOOOOOOOOOO

just read in another post it wasa JJ THOMPSON!YES SOOOOO GLAD I WROTE THAT!WOOOOOO

d4gurl

Zoodlebop wrote:

Yay, I got that exact answer for the heat and the water of crystalisation
I also got 11.7(11.69) for the pH

Would someone got through the methylbenzene calc. I got 90.3%, ye all seem to have got 91.3%.

I got all dem too I tnk!!woooooo!!! YAY!!! I cudnt do the one on question ten tho about the relative atomic mass that made me mad!! For qustion ten b anyone say the reducing agent was Idoine?

Zoodlebop

Shark-69 wrote:

For q11 a did any1 get 0.03 moles for part (iii) and 2.22g for part (v)..? .......I got 91.3% for q4(d) aswell and 11.7 for 4(h).......damn dat picture....I didn't really bother to read the question fully....just saw 'name the scientist' and wrote down Crookes........

Yeah, I got 0.03 and 2.22g.

Feral Mutant

Zoodlebop wrote:

Would someone got through the methylbenzene calc. I got 90.3%, ye all seem to have got 91.3%.

I don't remember what I got offhand but it sounds like you might've forgotten that since the CH3 was bonded to the benzene, the benzene only had five hydrogens.

Brods

methyl benzene c6h5ch3

find Mr and then find the percent of Carbon out of that, its 84/92 x100 = 91.3%

porn_star

i did shhhhhit

oh well
chemistry never liked me much

d4gurl

I have some questions!someone please tell me!

Question 1 a is the anwser Na2Co3?
What is the conjugate acid and base of h2o
Question 4 g i j
question 5 a iii

If anyone would be kind enuf to tel me what they said for them Id appreciate it!now im off!!

irishguy00

d4gurl wrote:

I have some questions!someone please tell me!

Question 1 a is the anwser Na2Co3?
What is the conjugate acid and base of h2o
Question 4 g i j
question 5 a iii

If anyone would be kind enuf to tel me what they said for them Id appreciate it!now im off!!

Anhydrous Na2 Co3

Conjugate acid= H30+
Conjugate Base= OH-

MTBE= Methyl Tetra Butyl Ether, used to increase octance number of a fuel

helles belles

yeah i got that too

goodgod3rd

irishguy00 wrote:

Anhydrous Na2 Co3

Conjugate acid= H30+
Conjugate Base= OH-

anhydrous Na2CO3 cant work can it?? becasue ya cant get it in a primary standard???:o
Naoh was my bet

Kwekubo

goodgod3rd wrote:

anhydrous Na2CO3 cant work can it?? becasue ya cant get it in a primary standard???:o
Naoh was my bet

Anhydrous Na2CO3 is indeed a primary standard. Only thing is I don't know whether it's a valid answer...

On the whole though that was one sexual paper.

irishguy00

goodgod3rd wrote:

anhydrous Na2CO3 cant work can it?? becasue ya cant get it in a primary standard???:o
Naoh was my bet

Nope, sorry. Looking at my book right at this very minute...
Anhydrous sodium carbonate IS a primary standard. NaOH isn't at all...

helles belles

it is a valid answer. i did a mock this morning and it had that exact question on it! and they gave anhydrous na2co3 as the ans

irishguy00

Kwekubo wrote:

Anhydrous Na2CO3 is indeed a primary standard. Only thing is I don't know whether it's a valid answer...

On the whole though that was one sexual paper.

It is a valid answer as the question contains HYDRATED sodium carbonate crystals. They were just checking if ya knew the difference...

goodgod3rd

hence the meek face...
damm it, you could of at least humored me..... :0

it was .. *he he* orgasmic.

why do i always get things... the wrong way around.

irishguy00

That was such an easy exam..

I did every question except for question 5. Ugghhhh.

I also got the exact same maths answers for the mathematical questions so that a good sign....

Overall very happy considering what could have come up.

WHOOOO. free now.

Jesus, what am i going to study now? might take a look at the cornflakes box...

irishguy00

curtains wrote:

Yes it's thompson, i think.

I wasn't too dying about the 1st experiment but thought that the rest of the aper was lovely. I got 60-something for the percentage and 10 for x too (je ne sais pas).

A few questions...
What is "the general principle of all colorimetry experiments"?
What did everyone get for the heat of combustion one? I got something in the 3000 bracket but i don't think it's right.
and What was the colour change in the MnO4 and I equation in q10? I siad purple to colourless, but again i don't know.

The principle is that the intensity of the colour observed is in direct proportionate to the concentration of free chlorine. (basically the pinker it is, the more free chlorine there is)