Woahhh ur good.. seems like they may also use it for unit 2 chem. Never thought of solving other exam boards other than edexcel, thanks for notifying us! :smile:

Reply 123

saifulahmed

1

Original post by hhalai96

isn't bond enthalpy values positive?

yah but their value was negative.

Reply 124

hhalai96

1

Original post by Paras Agarwal

see question 6 and 15 here!!! http://www.docstoc.com/docs/119150131/Reactions-of-Alkanes-and-Alkenes

the last question was kinda hard

Reply 125

hhalai96

1

Original post by saifulahmed

yah but their value was negative.

so would it be wrong if you kept your answer as a positive one ?

Reply 126

hhalai96

1

Original post by hhalai96

the last question was kinda hard

what were the answers in that document of question 6 and 15 ?

Reply 127

samakawg

1

I wrote irritant :P I actually had an experience xP

Reply 128

samakawg

1

Original post by avishyaa

would it be right to say that the hazard related to hydrogen bromide is that it's toxic/poisonous?

I wrote irritant :P I actually had an experience xP

Reply 129

saifulahmed

1

Original post by hhalai96

so would it be wrong if you kept your answer as a positive one ?

i don really know. the value they gave was enthalpy change of reaction. may be the reaction was exothermic, and the bond energy might be positive. now i'm thinking positive might be correct cause the question was for 2 marks. so may be you are correct! :smile:

Reply 130

hhalai96

1

what was the answer for the last question on ionisation...

i wrote about the ionisation increases as electrons are removed but there is a big jump from 6 to 7...
this shows that the 7th and 8th electron are next to the nucleus and the rest are in another shell.. this shows that oxygen atom has electrons filled in the 2 electron shells only

Reply 131

Ripper Phoenix

17

Original post by hhalai96

what was the answer for the last question on ionisation...

i wrote about the ionisation increases as electrons are removed but there is a big jump from 6 to 7...
this shows that the 7th and 8th electron are next to the nucleus and the rest are in another shell.. this shows that oxygen atom has electrons filled in the 2 electron shells only

lol didnt u see my post?? the questions are in that paper with mark scheme

Reply 132

hhalai96

1

Original post by Paras Agarwal

MARK SCHEME
https://www.google.com/search?q=ocr+june+2007+gce+chemistry+mark+scheme&oq=ocr+june+2007+gce+chemistry+mark+scheme&aqs=chrome..69i57j0l5.8549j0j7&sourceid=chrome&es_sm=93&ie=UTF-8

OPEN FIRST LINK! SCROLL DOWN!!! CHECK FOR THE C6H13BR QUESTION!!

scroll down to page 17.. few questions there also

Reply 133

Fattyma97

2

Why is it positive :eek:

Posted from TSR Mobile

Reply 134

hhalai96

1

Original post by Fattyma97

Why is it positive :eek:

Posted from TSR Mobile

because its bond enthalpy... endothermic reaction breaking of bonds....
the enthalpy change given was for enthalpy of reaction ....

Reply 135

hhalai96

1

Original post by hhalai96

scroll down to page 17.. few questions there also

Thats 38 marks from OCR ...

Reply 136

Lorri97

Original post by hhalai96

because its bond enthalpy... endothermic reaction breaking of bonds....
the enthalpy change given was for enthalpy of reaction ....

Yeah but they will probably just say ignore sign in the mark scheme as they usually do... the important part of the question was the calculation not the sign lol

Reply 137

Ripper Phoenix

17

i wish i hadnt stumbled upon the mark scheme!! grrrrr!!

Reply 138

samakawg

1

Original post by Paras Agarwal

i wish i hadnt stumbled upon the mark scheme!! grrrrr!!

Lol jobless fellow xP

Reply 139

Vivekmaj

1

The question about "why do the CIS and TRANS isomers form the same product" which is in the MSc, my answer is different I wrote "they are geometric isomers and hence originate from hexene this give the same product at the end"

Edexcel Chemistry Unit 1 IAL (WCH01) Core principles of chemistry - 23rd May 2014

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