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**Chemistry...Before/After
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Oh and the question on the rate of raction, what was the shape of the second graph for ye? Mine was less steep due to the lower concentration and it levelled off lower down due to the marble chips being excess like.
Yeah, mine levelled off at around 20.5g... Did you put time on the bottom? I know you usually put the top line on the bottom, but it didn't feel right
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Ya that's what I did, wasn't sure about it at first but now I feel confident!Oh and the question on the rate of raction, what was the shape of the second graph for ye? Mine was less steep due to the lower concentration and it levelled off lower down due to the marble chips being excess like.
Thank you
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Pretty annoyed at the paper, things like that ethene calculation ruined me. Loada silly mistakes aswell, did test for phosphate instead of chloride in water, did green->pink->green instead of pink green pink for sodium tartrate thing. Forgot to divide by 2 in first experiment. GAH loads of small things and then stuff I just didn't know
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Maths questions answers I got:
1. b) 2.65 g Na2CO3 used
e) i) 2.5 moles/L , ii) 91.25 g/L
2. e) 8 tubes of ethene
3. d) Mr = 63
4. a) i) 5 , ii) 9
e) Cu + 2NO3 + 4H -> Cu + 2NO2 + 2H2O
6. e) 224 kJ/mol
9. 0.00238 g/s - 2M HCl
1/2 that for 1 M HCl
10.
i) 13.7 , ii) 5.69
11. Kc = 704.95
Somebody tell me, was I right or wrong! I did two extra questions anyways, so I ahve a bit of wiggle room!0 -
And was so annoyed that I didn't study heat of formation. I got all that question right then 0 for the heat of formation part....
Anyone care to tell how you do the ethene test tube thing? Some people in my school got 8, and people saying here, so I presume thats right.0 -
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I got 13.33 test tubes, rounded down to 13 full ones, didn't even realise that you had to divide by anything in the first experiment Q >.< There goes the A1..
Was never gonna get the test tubes, but not dividing by 2 is so annoying Done that kind of question so many times before, and then forget to do it when it matters 0 -
Maths questions answers I got:
1. b) 2.65 g Na2CO3 used
e) i) 2.5 moles/L , ii) 91.25 g/L
2. e) 8 tubes of ethene
3. d) Mr = 63
4. a) i) 5 , ii) 9
e) Cu + 2NO3 + 4H -> Cu + 2NO2 + 2H2O
6. e) 224 kJ/mol
9. 0.00238 g/s - 2M HCl
1/2 that for 1 M HCl
10. i) 13.7 , ii) 5.69
11. Kc = 704.95
Somebody tell me, was I right or wrong! I did two extra questions anyways, so I ahve a bit of wiggle room!
Almost exactly the same as mine. I got -224 for the heat though, and pretty sure I messed up the last part of q3. I think all the others are the same as mine.0 -
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Maths questions answers I got:
1. b) 2.65 g Na2CO3 used
e) i) 2.5 moles/L , ii) 91.25 g/L
2. e) 8 tubes of ethene
3. d) Mr = 63
4. a) i) 5 , ii) 9
e) Cu + 2NO3 + 4H -> Cu + 2NO2 + 2H2O
6. e) 224 kJ/mol
9. 0.00238 g/s - 2M HCl
1/2 that for 1 M HCl
10. i) 13.7 , ii) 5.69
11.Kc = 704.95
Somebody tell me, was I right or wrong! I did two extra questions anyways, so I ahve a bit of wiggle room!
I got 224 but don't forget the - !
Did you inverse the kc?0 -
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