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Edexcel GCE AS Chemistry Unit 1: 22nd May 2015 + Unit 2: 02nd June 2015

Reply 380

BBeyond

15

Original post by samb1234

Yep

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u done all the papers?

Reply 381

samb1234

13

Original post by BBeyond

u done all the papers?

Except maybe 1 or 2 yeah

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Reply 382

dripper

14

i take a deep breath, as i enter this thread

OP

I did a unit 1 past papers and I was doing unit2 although 1 is on Friday lol
What a smart idea by me

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Reply 385

dexirion

1

Anybony know how to do a question like this?

Reply 386

C0balt

16

Original post by dexirion

Anybony know how to do a question like this?

Hess cycle
Which year is it? I don't remember doing it although I've done all available years

Edit: samb uploaded his cycle quite recently so go back a few page
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(edited 8 years ago)

Reply 387

sandpitturtle

6

lol here comes my one day of cramming definitions and mechanisms like mad :s

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Reply 388

usmanzubair

3

Original post by ella_chloe

lol here comes my one day of cramming definitions and mechanisms like mad :s

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I am with you haha :teeth:

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Reply 389

C0balt

16

Tell me exact definition of mean bond enthalpy and bond enthalpy
I can do all the calculations and multiple choice but if I get asked written question on it im like uh....one mole of bonds broken in gaseous states to form gaseous atoms...ish?

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Reply 390

samb1234

13

Original post by C0balt

Tell me exact definition of mean bond enthalpy and bond enthalpy
I can do all the calculations and multiple choice but if I get asked written question on it im like uh....one mole of bonds broken in gaseous states to form gaseous atoms...ish?

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Yep

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Reply 391

dexirion

1

Original post by C0balt

Hess cycle
Which year is it? I don't remember doing it although I've done all available years

Edit: samb uploaded his cycle quite recently so go back a few page
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This was the January 2015 paper I've done in class like a month ago

Reply 392

pineneedles

14

Original post by C0balt

Tell me exact definition of mean bond enthalpy and bond enthalpy
I can do all the calculations and multiple choice but if I get asked written question on it im like uh....one mole of bonds broken in gaseous states to form gaseous atoms...ish?

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When answering enthalpy definition questions start "The enthalpy change that takes place when..."
For bonds it'd be the enthalpy change that takes place when one mole of a given bond of a gaseous species is broken (to form one mole of gaseous atoms)
Just noticed my textbook specifies that the bond breaking should be homolytic fission

(edited 8 years ago)

Reply 393

sandpitturtle

6

Original post by dexirion

This was the January 2015 paper I've done in class like a month ago

huhh thought they stopped jan papers this year?!

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Reply 394

C0balt

16

Original post by pineneedles

When answering enthalpy definition questions start "The enthalpy change that takes place when..."
For bonds it'd be the enthalpy change that takes place when one mole of a given bond of a gaseous species is broken (to form one mole of gaseous atoms)
Just noticed my textbook specifies that the bond breaking should be homolytic fission

I know every other enthalpy definition like my name but bond enthalpy was a dodgy one

Ha nice info there, we've never opened the book LOL

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Reply 395

C0balt

16

Original post by dexirion

This was the January 2015 paper I've done in class like a month ago

Woot is January paper even a thing still?

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Reply 396

samb1234

13

Original post by C0balt

I know every other enthalpy definition like my name but bond enthalpy was a dodgy one

Ha nice info there, we've never opened the book LOL

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Who needs a text book when we have chemguide?

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Reply 397

frozo123

12

Original post by C0balt

Tell me exact definition of mean bond enthalpy and bond enthalpy
I can do all the calculations and multiple choice but if I get asked written question on it im like uh....one mole of bonds broken in gaseous states to form gaseous atoms...ish?

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What's your definition for atomisation? :smile: