AQA Chem Unit 1 May 22nd 2015 OFFICIAL THREAD

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Reply 1180

JamboGooner

Original post by sleepisheaven

For the calculations I got

627g
190.5g
4.32 moldm^-3

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I got 627g, 190.5 and 4.62moldm-3, it's 4.62 because (1000x(150/65))/500 = 4.62

Reply 1181

IvoryToast

Original post by EzBB

is v-shaped an acceptable alternative to bent ?

Yes

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Reply 1182

Boundless_x

Original post by 12345678zzz

I thought there were 16 electrons in total so I put CO2 :redface:

CO2 is right! 6 + 8 + 8 = 22

Reply 1183

sleepisheaven

What bond angle did everyone get for h2o2

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Reply 1184

Anon_98

Original post by Boundless_x

Me too!

*MAJORTASTIC HIGHFIVE* :smile:

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Reply 1185

damnthoseexams

That seems pretty decent however u would probably have to put the (g) state symbol in ur equation where the Te gets an electron

Original post by rocky908

Silicon
argon
chlorine
x=6
695g
287.5g (minimum decomposed)
4.62mol/dm3
127.8
m/z value from periodic table uses more isotopes
arrow from n///n -> n-
larger difference in electronegativity leads to hydrogen bonding , smaller difference in electronegativity leads to van de wall forces
Te+ + e- -> Te

That's all I remember, any corrections/more answers would be appreciated

Reply 1186

thehollowcrown

Original post by Boundless_x

Lol I thought I was crazy for getting that answer, everyone in my class got a different answer to me! But I got the same as you! :smile:

sweet baby jesus thank you <3

Reply 1187

JamboGooner

Yeah that's what I got.

Original post by textbookgeek123

Was the one with 550g sodium amide had 627g of sodium azide?

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Reply 1188

darkbluepp

Original post by 12345678zzz

I thought there were 16 electrons in total so I put CO2 :redface:

(ఠ_ఠ) Calm down, CO2 has 22 electrons too. C has 6, each O has 8.

Reply 1189

Anon_98

Original post by sleepisheaven

What bond angle did everyone get for h2o2

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I put..104.5. - Think its wrong though. ;(

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Reply 1190

sleepisheaven

Anybody else put SiO2 for the molecule it has 16 electrons don't it

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Reply 1191

sleepisheaven

Original post by Anon_98

I put..104.5. - Think its wrong though. ;(

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I put 120 guessed tho

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Reply 1192

ASLEVELSHELPME

What about the Te which one had a bigger radius

Reply 1193

Cadherin

Original post by Bloom77

Nope
Sorry
It's either bent or non-linear

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But they've accepted tetrahedral before for 3bp 1lp.

Reply 1194

textbookgeek123

Original post by sleepisheaven

Anybody get 627g

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I got that!!! Did you first get 660g then multiply by 95%?

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Reply 1195

Boundless_x

Original post by Anon_98

I put..104.5. - Think its wrong though. ;(

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Same

but I think it's right... We can only hope! :yep:

Reply 1196

Tobybeta

For the dative bonding, which was around was the arrow? I got N///N <--- N-

Also, for the one about making sure the water had all gone, did any of you say to add anhydrous copper II Sulfate, and if it remains white then no water is left?

Reply 1197

Ebaysass

Original post by ASLEVELSHELPME

What about the Te which one had a bigger radius

Was it not the same??

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Reply 1198

saad97

Why is everyone getting 670-695g for the mass?
I got about 626 or something, did you remember that the yield was only 95%? Confused :/

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