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

Elizajayne
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#1101
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#1101
(Original post by ToLiveInADream)
Guys was the reaction endo or exothermic? I can't remember what it looked like so now I'm not sure..

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i think the reaction was exothermic the products were at a lower energy than the reactants
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Sulfur
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#1102
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#1102
(Original post by olmyster911)
I put H+ Cl- for the hydrochloric, and H+ SO42-​ for the sulphuric!
I did that. I never knew you had to put 2x H+ ions for the sulphuric acid.
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olmyster911
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#1103
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#1103
(Original post by cupcakes16)
I ticked products have less energy than reactants. is this right?
Yes. It was an exothermic reaction. Did you tick that the temperature changes?
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akl141
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#1104
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#1104
(Original post by olmyster911)
I put H+ Cl- for the hydrochloric, and H+ SO42-​ for the sulphuric!
Make sure you put: H+ and another H+ and S04 2-

Sulfuric acid gives off two hydrogen ions and one sulfuric ion.
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Fishhy34
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#1105
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#1105
(Original post by Sulfur)
So did I.
is that right because i though it was the oxygen being removed from the aluminium oxygen
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cupcakes16
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#1106
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#1106
(Original post by Sulfur)
So did I.
Was that right?
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akl141
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#1107
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#1107
(Original post by Sulfur)
I did that. I never knew you had to put 2x H+ ions

Well sulfuric acid was H2S04 so there are two hydrogen ions present. The question also stated that you can use each ion "once, more than once, or not at all" so it implied that you may have to put two of them.
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olmyster911
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#1108
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#1108
(Original post by Sulfur)
I did that. I never knew you had to put 2x H+ ions
I don't think you did to be honest. I think people got the wrong idea of 'you may use it once, more than once or not at all'. It said list the ions present, not how many of each ion present
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Sulfur
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#1109
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#1109
(Original post by Fishhy34)
is that right because i though it was the oxygen being remove from the aluminium oxygen
(Original post by cupcakes16)
Was that right?
Unsure if it's right, but that's what I put (also said that in C123 too).

(Original post by olmyster911)
I don't think you did to be honest. I think people got the wrong idea of 'you may use it once, more than once or not at all'. It said list the ions present, not how many of each ion present
Exactly! I thought that applied to the different compounds.
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TomAyy
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#1110
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#1110
Was that not for the fact that you use H+ in both hydrochloric acid and sulphuric acid?
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olmyster911
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#1111
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#1111
(Original post by Sulfur)
Exactly! I thought that applied to the different compounds.
I think we're correct, but I guess we'll never know xD
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Sulfur
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#1112
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#1112
(Original post by TomAyy)
Was that not for the fact that you use H+ in both hydrochloric acid and sulphuric acid?
Exactly.
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LordMoonNinja
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#1113
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#1113
(Original post by olmyster911)
I don't think you did to be honest. I think people got the wrong idea of 'you may use it once, more than once or not at all'. It said list the ions present, not how many of each ion present
Yeah, it was two marks, I'm sure you didnt need two of the H+ to get the marks, besides one is fine because they simply asked for what was in it; it is fine if you put two though.. they cant mark you down I think the penultimate question was really weirdly worded!
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akl141
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#1114
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#1114
(Original post by olmyster911)
I don't think you did to be honest. I think people got the wrong idea of 'you may use it once, more than once or not at all'. It said list the ions present, not how many of each ion present
Well that is true, I think you would still get a mark for placing just one Hydrogen ion. But the ions present in H2S04 are two hydrogen ions and one sulfate ions, it links in with how many of each is present?
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cupcakes16
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#1115
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#1115
(Original post by Sulfur)
Unsure if it's right, but that's what I put (also said that in C123 too).



Exactly! I thought that applied to the different compounds.
I put reduction is gaining electrons. Is this wrong?
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akl141
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#1116
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#1116
(Original post by cupcakes16)
I put reduction is gaining electrons. Is this wrong?
Reduction would be the loss of oxygen in a compound.
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cupcakes16
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#1117
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#1117
(Original post by akl141)
Reduction would be the loss of oxygen in a compound.
So i got it wrong???
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Fishhy34
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#1118
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#1118
(Original post by cupcakes16)
So i got it wrong???
i wrote it was the loss of oxygen
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olmyster911
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#1119
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#1119
(Original post by LordMoonNinja)
Yeah, it was two marks, I'm sure you didnt need two of the H+ to get the marks, besides one is fine because they simply asked for what was in it; it is fine if you put two though.. they cant mark you down I think the penultimate question was really weirdly worded!
I hope I get both marks! To be honest I think a lot of the questions were weird, like the copper 6 marker!
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olmyster911
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#1120
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#1120
(Original post by akl141)
Well that is true, I think you would still get a mark for placing just one Hydrogen ion. But the ions present in H2S04 are two hydrogen ions and one sulfate ions, it links in with how many of each is present?
I guess it's down to how we interpreted the question. If enough people put one thing and the other half put another thing, the exam board will most likely accept both.
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