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# Ocr gateway CHEM 4 5 6 markscheme

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1. (Original post by JickDee)
But didnt it say that only 18% of the land was agricultural land in the table?
So you had to multiply 1.26 billion by 0.18 to get the actual amount?
The 18% wasn't included in calculation i didn't use it I can't actually remind question
2. What is the boundaries for A* my grade all together I've worked out (pper 1,2 and coursework) is 81.75% of the total 400
3. The missing question in c4 was the disadvantages of superconductors: they have to be used a very low temperatures

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4. (Original post by HouseOfRichman)
The missing question in c4 was the disadvantages of superconductors: they have to be used a very low temperatures

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I included it
5. Could you just remind of question 3 on C5 I can't really picture it thanks so much!

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6. Just physics left now!!!!!
7. I think I did really good in bio I'm converting my raw marks to ums and wow I'm shocked
8. (Original post by ellamoon_22)
What is the boundaries for A* my grade all together I've worked out (pper 1,2 and coursework) is 81.75% of the total 400
90% UMS is A*, so 360/400
9. (Original post by Meganward123)
can someone please explain the concentration 6 marker?
I worked out that there were 0.0025 moles, 0.0025/(20/1000) equals 0.125 mol/dm3
I got that at first but i did the wrong liquids concentration so maybe u did that too?
10. I got the second QWC completely wrong because I used the volume of HCl used to get a pH of 1 (40cm3) not pH 7 (20cm3). But I still used the same equation and calculations, I just got a different answer. Sorry to bother, but how many marks do you think I would get?
11. (Original post by Str355ed)
I got that at first but i did the wrong liquids concentration so maybe u did that too?
That's exactly what I did then I had to change it for the correct one

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12. (Original post by Vanilla Cupcake)
90% UMS is A*, so 360/400
Hopefully my grade is higher I've been doing my grades at worst possible so I don't get my hopes up lol
13. (Original post by artloser)
I got the second QWC completely wrong because I used the volume of HCl used to get a pH of 1 (40cm3) not pH 7 (20cm3). But I still used the same equation and calculations, I just got a different answer. Sorry to bother, but how many marks do you think I would get?
4/5 I did same thing as long as everything else is correct then highly think it will be 5
14. (Original post by ellamoon_22)
4/5 I did same thing as long as everything else is correct then highly think it will be 5
Thank you !
15. What did you guys get for the Mendeleev question?
16. (Original post by Missstargirl)
What did you guys get for the Mendeleev question?
Something about him arranging elements in a table and he noticed there were periodic pattern changes. Where there were gaps in the patterns he predicted the discovery of unknown elements and their unknown properties.

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17. (Original post by Missstargirl)
What did you guys get for the Mendeleev question?
I said he arranged the elements in a table. He left gaps in the table where the element didn't fit the column properties. He helped predict the properties of undiscovered elements.
18. (Original post by HouseOfRichman)
Could you just remind of question 3 on C5 I can't really picture it thanks so much!

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SAME! i really don't remember :/
19. Can you write the concentration of acid to be the amount of H+ ions in the acid/solution?
20. Oh my God, I'm such a ****. I worked out 10/2 = 5 and I done 10 * 6?? = 60g ffs.

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