GCSE OCR 21st Century Triple Science (CBP1-7) Thread Watch

superstar16
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#1141
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#1141
i really want an A* overall for additional science. i have a really high A* in coursework and i think i would get about 45 for biology and 34 for chemistry and if i get about 40 for physics, can i still get an A* overall??
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Sulfur
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#1142
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(Original post by fewik)
weren't a and b similar because they're both acids so they give a low ph reading and both hydrochloric acid and sulfuric acid produce hydrogen when reacting with metals.
also c was different because Hcl wouldn't produce a precipitate when sulfuric acid would. And vice versa for d (sulfuric acid wouldn't produce a precipitate with silver.

What were your observations?
They were all worth 3 marks each, so 6 overall which makes me wonder if they'd accept your opinion? `

I said that A was different because they'd produce a different pH because they would be of different acidity (they both can't be 1.51, 1.90 etc). I also said B was different because HCl would react faster than H2SO4.

For C and D I just wrote "They produce a white precipitate when they react". I had no idea.
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cupcakes16
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#1143
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#1143
Can anyone remember what the C6 six marker was?
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DDan123
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#1144
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#1144
The ABCD question was 6 marks so I guess if you didn't write which ones were similar and different correctly, that's all 6 marks gone??


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cupcakes16
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#1145
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(Original post by DDan123)
The ABCD question was 6 marks so I guess if you didn't write which ones were similar and different correctly, that's all 6 marks gone??


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Yep
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Sulfur
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#1146
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(Original post by cupcakes16)
Yep
(Original post by DDan123)
The ABCD question was 6 marks so I guess if you didn't write which ones were similar and different correctly, that's all 6 marks gone??


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Not necessarily - we don't know the mark scheme and it appears that you could give evidence for both sides.
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cupcakes16
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#1147
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(Original post by Sulfur)
Not necessarily - we don't know the mark scheme and it appears that you could give evidence for both sides.
Do you think the grade boundaries will be slightly lower?
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Magnesium
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#1148
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(Original post by Sulfur)
They were all worth 3 marks each, so 6 overall which makes me wonder if they'd accept your opinion? `

I said that A was different because they'd produce a different pH because they would be of different acidity (they both can't be 1.51, 1.90 etc). I also said B was different because HCl would react faster than H2SO4.

For C and D I just wrote "They produce a white precipitate when they react". I had no idea.
I said A and B were the same since A gives a pH reading of below 7 for both and B produces a salt and hydrogen in both.

I said C and D were different because they both produced a white precipitate with one of the acids but then had no reaction with the other.

What did you put for the ions in the different acids question?
I put H+ and Cl- for Hydrochloric acid and then H+ and SO42- for the sulfuric acid
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Sulfur
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#1149
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#1149
(Original post by cupcakes16)
Do you think the grade boundaries will be slightly lower?
41 last June and it was easy in my opinion, so hopefully.
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Magnesium
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#1150
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#1150
(Original post by cupcakes16)
Can anyone remember what the C6 six marker was?
Rates of reaction with the graph measuring time against mass lost
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Sulfur
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#1151
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(Original post by Magnesium)
I said A and B were the same since A gives a pH reading of below 7 for both and B produces a salt and hydrogen in both.

I said C and D were different because they both produced a white precipitate with one of the acids but then had no reaction with the other.

What did you put for the ions in the different acids question?
I put H+ and Cl- for Hydrochloric acid and then H+ and SO42- for the sulfuric acid
I put that for the ion question
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JazzyT17
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#1152
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I put proton and electron for postive, negative will I still get 1 mark? Was it out of 2? Also the last question i put oH- and then so4 2- would I get one mark?
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Magnesium
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#1153
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(Original post by Sulfur)
I put that for the ion question
Ah good, I found the paper overall was pretty good actually, quite happy
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DDan123
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#1154
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(Original post by Sulfur)
Not necessarily - we don't know the mark scheme and it appears that you could give evidence for both sides.
Hmmm I hope so. After the exam I was feeling really confident of getting an a* in this paper. But losing 6 mark due to misinterpreting the question I found the rest of the exam good though, wbu??
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Magnesium
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#1155
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(Original post by JazzyT17)
I put proton and electron for postive, negative will I still get 1 mark? Was it out of 2? Also the last question i put oH- and then so4 2- would I get one mark?
You'd get 1 mark for the electron one I think and no marks for the ion question because i think it was 2 ions in each box and you would have need 2 correct in atleast one box to get 1 mark. I'm assuming the ion question was out of 2 marks?
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hello019
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#1156
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#1156
how many marks was the last question worth?
and for the abcd question what were the two reasons that were given for cd being similar?
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Sulfur
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#1157
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#1157
(Original post by JazzyT17)
I put proton and electron for postive, negative will I still get 1 mark? Was it out of 2? Also the last question i put oH- and then so4 2- would I get one mark?
Yup 1/2.
The last question required H+ and Cl- for HCl and H+ (2x?) and SO42- for the H2SO4
So if you got 2/4 of these you should get 1/2 marks.

(Original post by DDan123)
Hmmm I hope so. After the exam I was feeling really confident of getting an a* in this paper. But losing 6 mark due to misinterpreting the question I found the rest of the exam good though, wbu??
Exact same feelings - messed up stupid and simple questions though.
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cupcakes16
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#1158
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#1158
(Original post by Magnesium)
Rates of reaction with the graph measuring time against mass lost
What did u write for it?
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Magnesium
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#1159
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#1159
For the rates of reaction 6 marker, did anyone put that the rate of reaction was fast at first because of the high concentration and large surface area of the zinc metal and then it decreased at B because some of the reactants were used up and then it stopped at C because all the reactants had been used up in the collisions and there were no more reactions to be made by the collisions? or something along those lines
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Magnesium
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#1160
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#1160
(Original post by cupcakes16)
What did u write for it?
I just answered this below your post
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