[books28]

(Original post by Maat)
for the last question, about the corrosion of the metal, i put something like:
the oxygen react with the metal and this causes disfigurements in the layers which makes it less efficient to conduct electricity, would that get me anything

I think that you would probably get a mark for the oxygen reacting and maybe for the layers (although this is more ambiguous) but I think you might have had to mention electrons for full marks.

[kILLERm]

(Original post by Maat)
for the last question, about the corrosion of the metal, i put something like:
the oxygen react with the metal and this causes disfigurements in the layers which makes it less efficient to conduct electricity, would that get me anything

I think you'll get both marks. My teacher said something similar to that. Would ionic bonding get any marks. Because it's a metal with a non metal. I also wrote that it would have to be molten or dissolved in water in order to conduct electricity as the ions become free to move around then.

[werdo1997]

(Original post by HopelessTurtle)
Alkaline was OH- ions,
and the other one about the Ph being 1, was H+ ions.

if i wrote hydrogen would i get the mark??

[kILLERm]

(Original post by werdo1997)
if i wrote hydrogen would i get the mark??

I think you may have had to say 'hydrogen ions'. Because hydrogen by itself is 'H2' which is incorrect because the H+ ions make the solution acidic.

[werdo1997]

(Original post by kILLERm)
I think you may have had to say 'hydrogen ions'. Because hydrogen by itself is 'H2' which is incorrect because the H+ ions make the solution acidic.

balls :/

[shippers123]

(Original post by kILLERm)
I think you may have had to say 'hydrogen ions'. Because hydrogen by itself is 'H2' which is incorrect because the H+ ions make the solution acidic.

this is what i put, hopefully i'll get the mark, because i know what it was asking to stated what the two meant
1/ what ions made solution x alkali? - Hydroxide or OH-
2/ what ions made the solution have a pH OF 1?- Hydrogen or H+

hopefully ill get the marks! and as for stating " hydrogen or hydroxide ions" it asked you " what IONS" so i think you'd get a mark

[kILLERm]

(Original post by werdo1997)
balls :/

actually, if it asked 'which ions make the solution alkaline/give the solution a pH of 1' then I believe you may get the marks for writing hydrogen and hydroxide because it already told u that they were ions.

[shippers123]

(Original post by kILLERm)
actually, if it asked 'which ions make the solution alkaline/give the solution a pH of 1' then I believe you may get the marks for writing hydrogen and hydroxide because it already told u that they were ions.

yes, i agree it said " which ions"

[Maat]

Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
this is because it is a continuous process so it doesn't matter if it does all react because it will go back round to stage 1 again. get the marks?

[kILLERm]

(Original post by Maat)
Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
this is because it is a continuous process so it doesn't matter if it does all react because it will go back round to stage 1 again. get the marks?

I wrote that the unreacted nitrogen and hydrogen can be reacted again. It also has a 100% atom economy and so no useless products are produced.

[Maat]

yeah, you should be fine with that,
would mine??

[Mohi15]

Is anyone going to post the unofficial mark scheme

[shippers123]

For the " what made solution x alkali" does it matter if you put hydroxide or OH-? I put both will I get marked down for it?

[x-Sophie-x]

(Original post by shippers123)
For the " what made solution x alkali" does it matter if you put hydroxide or OH-? I put both will I get marked down for it?

If you put OH- first, then that's correct.

But it's hydroxide ions. I'm sure you'll get the mark though.

[kILLERm]

(Original post by Maat)
yeah, you should be fine with that,
would mine??

You've definately got 1/2 marks for mentioning that the unreacted nitrogen and hydrogen go back to stage 1. But i'm quite disorientated about what they would've expected you to do for the 2nd mark. That's why I put 2 points down. But you may get 2 marks for mentioning ' unreacted nitrogen and hydrogen' are 'reacted back again/sent to stage 1'. In my opinion, they're 2 valid points and so you should get the marks .

[kILLERm]

(Original post by shippers123)
For the " what made solution x alkali" does it matter if you put hydroxide or OH-? I put both will I get marked down for it?

No. They don't mark you down for incorrect content. They reward you for the correct content. So in this case, you have definately given the correct answer and so you've definately got the mark. Stop getting upset about this. Nothing that you put down was incorrect. It just shows that you have a better understanding by mentioning it in both forms. Be proud of yourself cuz I only put H+ and OH- for the questions on pH1 solution and Alkaline solution.

[shippers123]

(Original post by x-Sophie-x)
If you put OH- first, then that's correct.

But it's hydroxide ions. I'm sure you'll get the mark though.

But it already said in the question " which ions?"

[x-Sophie-x]

(Original post by shippers123)
But it already said in the question " which ions?"

I know but some of the markschemes still require you to say "ions" to gain the mark.

You wrote OH- though, which is perfectly fine (:

[shippers123]

But I think I put hydroxide then OH- and the same for the ph one hydrogen run H+

[shippers123]

What acid did everyone circle?