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

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Thank you - I remember having to put in ions or something in two boxes (for hydrochloric acid + sulphuric acid or something) but that was the last question - that was the only question I came across with hydrochloric acid + sulphuric acid in it... Hopefully I haven't lost out on too many marks :s-smilie:

What did you put for that question?

Reply 1081

Fishhy34

Original post by cupcakes16

I put it means gaining electrons?
You?

i said it was the loss of oxygen :frown:

Reply 1082

romaiseb

Original post by olmyster911

What did you put for that question?

For the ions/compounds that included a 'H' or 'Cl' in them, I put them in the hydrochloric box, and the ones with a 'S' in them i put in the sulphuric acid one :smile:

Reply 1083

ToLiveInADream

Guys was the reaction endo or exothermic? I can't remember what it looked like so now I'm not sure..

Posted from TSR Mobile

Reply 1084

akl141

Original post by romaiseb

For the ions/compounds that included a 'H' or 'Cl' in them, I put them in the hydrochloric box, and the ones with a 'S' in them i put in the sulphuric acid one :smile:

The hydrochloric acid box: H+ and Cl -
The sulfuric acid box: H+, H+ and S04 -2
those would be the correct answers for their ions.

Reply 1085

cupcakes16

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..

Posted from TSR Mobile

I put exothermic?

Reply 1086

akl141

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..

Posted from TSR Mobile

Exothermic reaction because the graph went from the top, to the bottom (so energy must have been given to the surroundings).

Reply 1087

cupcakes16

Original post by akl141

Exothermic reaction because the graph went from the top, to the bottom (so energy must have been given to the surroundings).

I ticked products have less energy than reactants. is this right?

Reply 1088

username1344042

Original post by romaiseb

For the ions/compounds that included a 'H' or 'Cl' in them, I put them in the hydrochloric box, and the ones with a 'S' in them i put in the sulphuric acid one :smile:

I put H⁺ Cl^-for the hydrochloric, and H⁺ SO₄^2- for the sulphuric!

Reply 1089

Fishhy34

what did you guys put for the abcd one ?

Reply 1090

mhusein

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..

Posted from TSR Mobile

I'm sure I put endo but I'm probably wrong

Reply 1091

akl141

Original post by cupcakes16

I ticked products have less energy than reactants. is this right?

Yes, the products in an exothermic reaction have less energy than the reactants.

Reply 1092

Sulfur

Original post by Fishhy34

i said it was the loss of oxygen :frown:

So did I.

Reply 1093

Elizajayne

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..

Posted from TSR Mobile

i think the reaction was exothermic the products were at a lower energy than the reactants :redface:

Reply 1094

Sulfur

Original post by olmyster911

I put H⁺ Cl^-for the hydrochloric, and H⁺ SO₄^2- for the sulphuric!

I did that. I never knew you had to put 2x H+ ions for the sulphuric acid. :s-smilie:

(edited 9 years ago)

Reply 1095

username1344042

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?

Reply 1096

akl141

Original post by olmyster911

I put H⁺ Cl^-for the hydrochloric, and H⁺ SO₄^2- 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.

Reply 1097

Fishhy34

Original post by Sulfur

So did I.

is that right because i though it was the oxygen being removed from the aluminium oxygen

(edited 9 years ago)

Reply 1098

cupcakes16

Original post by Sulfur

So did I.

Was that right?

Reply 1099

akl141

Original post by Sulfur

I did that. I never knew you had to put 2x H+ ions :s-smilie:

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.