It was minus anyways! When you did it in the calculator.
Sounded a little too hyperactive. Sorry. trying to revise history and it's killing me
Turn on thread page Beta
AQA chemistry higher- spec B watch
- PS Helper
- 14-06-2006 23:13
- 14-06-2006 23:18
o dear....it depends which way you minus them....if working out deltaH then you take the bonds formed from the bonds broken to get a negative. If working out energy change then you do bonds formed - bonds broken to give a POSITIVE NUMBER.
Unless you stipulated DeltaH=-730kj/mol then in the answer space you just wrote +730 (or 730)
- 14-06-2006 23:37
It actually doesn't mater because in mark schemes for previous paper it says 'ignore sign"
- 15-06-2006 09:20
Yeah, the sign is shown in brackets on the mark scheme, so i don't suppose it matters, after all that!