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National 5 Chemistry

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Jay431
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Original post by ŠotiBriti
16) You use a di-ol and a di-acid to make a polyester, so each has two functional groups. For an ester on the other hand you only have one functional group on each.

20) It's Calcium as Calcium is the only one of the elements which forms an insoluble carbonate, and cloudy means that there is an insoluble compound, so it's a precipitation reaction.


Thanks for the explanation! :smile:

Original post by Abbyy1234
Did you get 17.3% for the silicon calculation and CnH2n+2O for the general formulae?


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Yeah 17.3

I got CnH2n+O Was a bit confused on this one <<<
Original post by Ethan100
Okay so who's Marking scheme are we using so we can debate and work out the correct answers ?


I don't have a marking scheme I can hardly remember what I out for half of them haha


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Reply 402
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Jay431
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Anyone get 14.5 for relative atomic mass?
What did everyone get for the balancing equation?
Think I had 1 and a half in front of the H20 but I can't remember what else I did.
Original post by Jay431
Anyone get 14.5 for relative atomic mass?


Yeah


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Reply 405
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Jay431
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Original post by Abbyy1234


:biggrin:

Original post by ___Sophie___
What did everyone get for the balancing equation?
Think I had 1 and a half in front of the H20 but I can't remember what else I did.

I had a 2 somewhere and 4 somewhere. Can't remember.
My answers, Section 1

1. D
2. C
3. D
4. B
5. B
6. C
7. A
8. C
9. B
10. C
11. B
12. B
13. A
14. C
15. D
16. D
17. A
18. A
19. C
20. C

Please debate and correct me :smile:
Original post by Abbyy1234


I had that then changed it too 14 :frown:
For the EH=cmDeltaT

I changed the 100 g in to kg ( 0.1 kg)

Rearranged the equation and I think i got 50 degrees or something like that
Oh for the Ammonium question The industrial way of making it is the Haber process right ?

There was another ammonium question it was basically asking you for the advantages of it in fertilisers, what did you say ?
Reply 410
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Jay431
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Original post by Ethan100
For the EH=cmDeltaT

I changed the 100 g in to kg ( 0.1 kg)

Rearranged the equation and I think i got 50 degrees or something like that


Same here.

Had to use a bit of changing the subject and I think I got 50 as well
Anyone please correct me. These are the questions I'm not sure on.
I got strong then weak in the brackets for covalent bonding.
I put gold was used because it was an unreactive metal.
I put something like 56 seconds for the reaction stopping.



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For that working out the mole did everyone get 0.02 moles?

And what did everyone get write the molecular formula for limeone with bromine solution
Original post by ___Sophie___
What did everyone get for the balancing equation?
Think I had 1 and a half in front of the H20 but I can't remember what else I did.


Think I got 2 and 4 or 4 and 2.
Found that q quite hard and I like balancing equations
Reply 414
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Jay431
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Original post by Ethan100
Oh for the Ammonium question The industrial way of making it is the Haber process right ?

There was another ammonium question it was basically asking you for the advantages of it in fertilisers, what did you say ?


Yes it was Haber.

I don't remeber the other question that your asking about. Was it something to do with ammonium citrate?
Original post by Jay431
Same here.

Had to use a bit of changing the subject and I think I got 50 as well


I got 55 :frown:


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Original post by Jay431
Same here.

Had to use a bit of changing the subject and I think I got 50 as well


At the start I forgot to change it into kg and got 0.08 or something, haha.
Something was definitely wrong there
Original post by Abbyy1234
Anyone please correct me. These are the questions I'm not sure on.
I got strong then weak in the brackets for covalent bonding.
I put gold was used because it was an unreactive metal.
I put something like 56 seconds for the reaction stopping.




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When the reaction was stopped it was definitely 60 seconds
I got 0.85 for average rate and for the eh = cm delta t I got 55 :/
Reply 418
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Jay431
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Original post by Abbyy1234
Anyone please correct me. These are the questions I'm not sure on.
I got strong then weak in the brackets for covalent bonding.
I put gold was used because it was an unreactive metal.
I put something like 56 seconds for the reaction stopping.



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I got strong and weak as well, But I was unsure.
I got unreactive as well.
I wrote 53 seconds.

Dunno if they're right or wrong.

Original post by Lewis H01
For that working out the mole did everyone get 0.02 moles?

And what did everyone get write the molecular formula for limeone with bromine solution


Yep 0.02.

C something H something Br something lol

Original post by Abbyy1234




Original post by Ethan100
At the start I forgot to change it into kg and got 0.08 or something, haha.
Something was definitely wrong there


Original post by Lewis H01
When the reaction was stopped it was definitely 60 seconds
I got 0.85 for average rate and for the eh = cm delta t I got 55 :/


What did you guys rearrange the formula to?

I done Delta T = Eh/(c*m)
For the bromine one I kept the same molecular formulae for the carbons and hydrogenated and added Br2


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