ocr a f325 revision thread

Here are the questions, I hope they are big enough to read.




Posted from TSR Mobile

I am admiring the high quality camera on your Phone! My old blackberry couldn't dream of taking photos like that hahaha! Thanks alot Maths Nerd I really appreciate it.

Will try a few of them ! So from what people have said I should

1. Draw a Diagram
2. Read every single word carefully.

I still have a bit of trouble choosing what is being reduced and what is being ionised when they give you a Compound, i.e. I find it hard to formulate Ionic Equations. My Teacher said its only an Ionic Equation if something like a Precipitate is being formed. :/

But will try them and and come back in a few hours. Got lesson then Maths past papers

It's just my iPod really and well this should test you as most of these require you to produce half equations, they way I think about them is something will be oxidised and the other reduced, they should always tell you what's happening in them then you can see what you want to get.

For example MnO4- --->Mn2+
I firstly see oxygen that aren't on both sides so I put double the amount of Oxygen atoms of H+ ions to give:

MnO4- + 8H+ ---> Mn2+

Then I see on the right I need to balance the oxygen and hydrogen ions that I have, so add 4 molecules of water to give:

MnO4- + 8H+ ---> Mn2+ + 4H2O

Now finally I want to balance the charges on each side, so I've got -1+8= +7 on the left and +2 on the right, so 5 electrons are needed to balance this equation out to give the final one of

MnO4- + 8H+ +5 e- ----> Mn2+ + 4H2O

I do hope this helps you think through the steps


Posted from TSR Mobile

Have you done all past papers?

Not yet, I've still got 3 and the specimen to complete but I'm hoping to have them done this weekend


Posted from TSR Mobile

The specimen is probably the worst paper ever...lol nothing like the real stuff! But still good practice.
I am not sure what to revise anymore...I have gone through the textbook 4/5 times and saving my last 2 paper for the weekend!

Any ideas?

just do the papers, i finished them off a few days a go

The specimen is probably the worst paper ever...lol nothing like the real stuff! But still good practice.
I am not sure what to revise anymore...I have gone through the textbook 4/5 times and saving my last 2 paper for the weekend!

Any ideas?

I'd look around the Internet for similar styled questions to practice on as that's what I've done and its been quite helpful really


Posted from TSR Mobile

It's just my iPod really and well this should test you as most of these require you to produce half equations, they way I think about them is something will be oxidised and the other reduced, they should always tell you what's happening in them then you can see what you want to get.

For example MnO4- --->Mn2+
I firstly see oxygen that aren't on both sides so I put double the amount of Oxygen atoms of H+ ions to give:

MnO4- + 8H+ ---> Mn2+

Then I see on the right I need to balance the oxygen and hydrogen ions that I have, so add 4 molecules of water to give:

MnO4- + 8H+ ---> Mn2+ + 4H2O

Now finally I want to balance the charges on each side, so I've got -1+8= +7 on the left and +2 on the right, so 5 electrons are needed to balance this equation out to give the final one of

MnO4- + 8H+ +5 e- ----> Mn2+ + 4H2O

I do hope this helps you think through the steps


Posted from TSR Mobile

We're all gonna make it brah's !

soooooo scared

Just went over Jan 2013 Q8 with my Teacher.

It made sense fortunately!! It wasn't a Chemistry Question it was pretty much just a Maths question!!!

The specimen is probably the worst paper ever...lol nothing like the real stuff! But still good practice.
I am not sure what to revise anymore...I have gone through the textbook 4/5 times and saving my last 2 paper for the weekend!

Any ideas?

Indeed, that's why I like the calculation questions quite a lot because they're more Maths than Chemistry

any answers for those questions?

harder or much easier?

There are some irrelevant questions in yhere. I found it harder

any answers for those questions?

Please can anyone even try to explain how to get Q8 last part on jan 2013? Thanks !

You cheeky * .