Last question answer?

I got 0.0250 or something then changed to 1.8575 or something ... roughly . Couple of people got 0.4???.

Was the equation Cr + 2h+ ---> H2 + cr3+ (with the balancing(

Yeah i got that equation! Couldn't do the last one though! Only did like 2 lines.....there were too many numbers to work from in such little time :frown:

Reply 384

katiecornish

Original post by Waki

what about the first question what was the formula for monomer a?

Alcohol group one side C.acid group the other?

Reply 385

misspinx20

Original post by georgie94

mine had an alcohol group on the left and a -COOH on the right I think

ahh same! I'm sure it was that, cause both sides made an ester link when polymerised

Reply 386

georgie94

Original post by Demothesis

Last question answer?

I got 0.0250 or something then changed to 1.8575 or something ... roughly . Couple of people got 0.4???.

Was the equation Cr + 2h+ ---> H2 + cr3+ (with the balancing(

I got 1.8525... sound familiar? I really hope someone else got the same as me

Reply 387

georgie94

Original post by misspinx20

ahh same! I'm sure it was that, cause both sides made an ester link when polymerised

oh so the answer to the previous question was ester? because thats what i put

Reply 388

InkyOne

Original post by katiecornish

Alcohol group one side C.acid group the other?

Yeah, that's what I got!

but for the chromium equation I got:
Cr(s) +3H+(aq) > Cr3+(aq) + 3/2 H+(g)

Reply 389

misspinx20

What did you guys get for the infrared question? I put an alcohol group :s-smilie:

Oh and the bidendate question about drawing the 3-d molecule....HOW WERE YOU SUPPOSED TO DO THAT?!

Reply 390

bssjonny

nothing beats a good cry after a chemistry exam

Reply 391

misspinx20

Original post by georgie94

oh so the answer to the previous question was ester? because thats what i put

yeah i put down ester as well :smile:

Glad a few of my answers are beginning to look common!

Reply 392

misspinx20

Original post by InkyOne

Yeah, that's what I got!

but for the chromium equation I got:
Cr(s) +3H+(aq) > Cr3+(aq) + 3/2 H+(g)

3/2 H+ ??? Wasn't it 3H₂

Reply 393

14loubylou

Original post by bssjonny

nothing beats a good cry after a chemistry exam

couldn't agree more! :smile:

Reply 394

katiecornish

Original post by misspinx20

What did you guys get for the infrared question? I put an alcohol group :s-smilie:

Oh and the bidendate question about drawing the 3-d molecule....HOW WERE YOU SUPPOSED TO DO THAT?!

I put there was no alcohol group!! D: and yeah... I was at a loss for that one too

Reply 395

georgie94

Original post by misspinx20

What did you guys get for the infrared question? I put an alcohol group :s-smilie:

Oh and the bidendate question about drawing the 3-d molecule....HOW WERE YOU SUPPOSED TO DO THAT?!

I put 6 Ns around the central ion (top and bottom just normal line, two dotted lines and two wedges) then joined up each pair of Ns with the carbon-carbon bond

That made almost no sense. I couldn't attach a diagram it wouldn't let me :frown:

EDIT https://encrypted-tbn3.google.com/images?q=tbn:ANd9GcReXGGvwI1_IL1aESmmPxtXTYmsIi64N3Z6k0TMDHIkclmATBLu8w this is what I mean except with nitrogens not Xs obviously