OCR Gateway Chemistry C4C5C6 - 13/06/13

The H+ ions move to the cathode (because it is negative so they are attracted to it) and accept electrons from the cathode. Now, two hydrogen atoms will really want one more electron in their outer shell to make it complete, so they will bond covalently (share an electron) and become H2.

At the bottom of page 85 in the CGP revision guide it says "Electrolysis of hydrochloric acid or ethanoic acid produces H2 because they both produce H+ ions". I don't really understand this despite it sounding basic. I might have missed something but can someone explain this please.

Electrolysis causes hydrochloric acid and ethanoic acid to "break down" into ions. If you look at the chemical formula for hydrochloric acid (HCl) and ethanoic acid (CH₃COOH), they both contain a Hydrogen atom (underlined).

Therefore, both acids release H⁺ ions which are released during electrolysis and because Hydrogen is diatomic (meaning that it always travels around in pairs), 2 H+ ions are needed and bond to form H₂ which is released at the negative cathode.

Hope this helps

Be honest with me, guys.

In this upcoming Chemistry Exam, what would be the RAW mark for a B?

In addition, what grade does 120/160 equate to?

Sorry about the laziness but this Graphics exam has totally taken the energy out of me despite it going well.

Out of curiosity, during metallic bonding, why don't the closely packed electrons and positive ions repel away from each other?


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And 120/160 is a B. (middle B)

I thought that as well. I need 157/160 for an A* which is possible but the exam is on Thursday - It always turns out I fluke Chemistry somehow

I thought that as well. I need 157/160 for an A* which is possible but the exam is on Thursday - It always turns out I fluke Chemistry somehow

I thought that as well. I need 157/160 for an A* which is possible but the exam is on Thursday - It always turns out I fluke Chemistry somehow

Be honest with me, guys.

In this upcoming Chemistry Exam, what would be the RAW mark for a B?

In addition, what grade does 120/160 equate to?

Sorry about the laziness but this Graphics exam has totally taken the energy out of me despite it going well.

Wat mark was the exam out of?

Imagine you introduce a positive ion and a negative ion, they attract, then you introduce a second pair, with a positive and negative end. I don't know but I assume two together sort of flip round to arrange themselves like magnets do.

So basically all the positive ions and all the negative ions repel at first, and then as positives and negatives join up they're able to join with other pairs, which are then able to join with other quads.. etc

That might not be right but I think it makes sense?