OCR B (Salters) Chemistry F331 (Chemistry for Life) Thursday 23rd May Exam Discussion

At first I didn't notice that they were talking about water but then four minutes to the end I finally noticed and quickly wrote down the right answer *phew*


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How do you convert results to UMS?


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Yeah I wrote that too. I changed my answer at least 4 times though. I put (h2o)2+


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The answer was [H2O]+ right?

At first I didn't notice that they were talking about water but then four minutes to the end I finally noticed and quickly wrote down the right answer *phew*


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Water Mr=18, so it makes sense to get peaks below18 which are smaller, but HOW do you get peaks above 18?

90 UMS

unit 2 is 150?

How can so many people complain about missing the last page. They weren't trying to catch anyone out, they even wrote in bold letters "QUESTION 4 CONTINUES ON THE NEXT PAGE". You can't blame the exam board, you just need to read what's on the paper. Sorry if this offends anyone that missed it, but I don't see how it's anyone's fault but your own if you forget to read something, no point complaining about it now, what's done is done, and chances are those 3 marks won't affect your grade by much anyway.

Only thing I'm hoping is that (not to be mean) a lot of people missed them so the boundaries will be lower

Yay, think I lost about 3~4 marks to be safe, in case examiners don't like how I worded my answers. The questions I found awkward I got right for some reason.

Only thing I'm hoping is that (not to be mean) a lot of people missed them so the boundaries will be lower

Fragmentation would result in a smaller m/z - you would have to mention that there could be heavier isotopes of oxygen.


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What everyone say foe the question on why there's a smaller peak at m/z 20?
I threw in molecular fragmentation of water.