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Chem superhelp thread

Guess i can post all my worries here

http://filestore.aqa.org.uk/subjects/AQA-CHEM1-QP-JUN15.PDF
How am i supposed to do question 5a????
Reply 1
Original post by dskinner
Guess i can post all my worries here

http://filestore.aqa.org.uk/subjects/AQA-CHEM1-QP-JUN15.PDF
How am i supposed to do question 5a????


How many electron pairs are around the O?
Reply 2
Original post by alow
How many electron pairs are around the O?


O has 6 electrons in its outer shell and it gets 1 more from H and another one from O

so 4 electron pairs 2 lone pairs so angle is 107°???
Reply 3
Original post by dskinner
O has 6 electrons in its outer shell and it gets 1 more from H and another one from O

so 4 electron pairs 2 lone pairs so angle is 107°???


There are 2 LPs so probably closer to 105°.
Reply 4
Original post by alow
There are 2 LPs so probably closer to 105°.


oops good point

tetrahedral shape is 109.5° right?
Reply 5
Original post by dskinner
oops good point

tetrahedral shape is 109.5° right?


Yeah.
Reply 6
Original post by alow
Yeah.


http://filestore.aqa.org.uk/resources/chemistry/AQA-74041-SQP.PDF
I'm stuck on question 1 part 2 and 3 not sure what to do here

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