AQA AS Chemistry, unit 1

Is anyone doing the re-sit next thursday? I am and the topics I really hate is periodicity I hate the trends and I remember the january paper asked about the SECOND ionisation energy like who even learns about the 2nd one.... And probably organic chemistry :/

Btw, can someone explain the "shielding" effect please? :smile:

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Reply 1

drahc

Shielding effect - the ionisation enthalpy will be lower if there are more electrons. The attraction between the protons in the nucleus and the outer shell electrons will be less (as there are electrons in the way!).

Can't help with the rest, as I do OCR B (Salters)

Reply 2

lady123

Got this on Thursday. I need an A. Got a D the last time :frown:

Reply 3

Dingo749

Original post by SharminaSyeda

Are you on AqA I take it? If so as am I and I shall be doing the resit :smile:

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Reply 4

Herrington_x

I am also resitting this exam.
I am predicted a B since I achieved an A at GCSE but, I got an E in the Chem 1 January paper!
It's not because I didn't put in any effort/revise or whatever cause I in fact spent most of my time on chemistry out of all of my subjects. I'm just obviously not very good at it haha!
I'm hoping to get at least a C in the retake but, I don't think it's likely since AQA keep being really horrible and putting in questions that even chemistry teachers struggle to answer!
However I am dropping chemistry at the end of this school year so, it isn't my priority anymore!
Good luck to everyone sitting the retake and the Chem 2 paper later on :smile:

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Reply 5

SharminaSyeda

Original post by Dingo749

Are you on AqA I take it? If so as am I and I shall be doing the resit :smile:

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Yup AQA

Reply 6

x-Sophie-x

I'm taking this exam for the first time. Because our stupid school insists we get better results if we do both units in the summer Urgh! :angry:

I hate periodicity the most :frown:

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Reply 7

Dingo749

Original post by x-Sophie-x

I hate periodicity the most :frown:

Is Periodicity all that stuff about Ionisation Energies and Electron Shells etc.

Reply 8

x-Sophie-x

Original post by Dingo749

Is Periodicity all that stuff about Ionisation Energies and Electron Shells etc.

Yep unfortunately so :frown:

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Reply 9

mattj94

I have created revision notes for this exam and they can be found on my website http://www.mattsrevision.com/chemistry-in-action/

Matt

Reply 10

Sherlockedd

The best way to revise for U1 chem is to learn markscheme answers, there are some questions which pop up every year

Reply 11

TheLightBulb

Original post by mattj94

I have created revision notes for this exam and they can be found on my website http://www.mattsrevision.com/chemistry-in-action/

Matt

Hi Matt,

They're really good!! :smile:

do you by any chance have unit 2 notes aswell please?

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Reply 12

Tabby.1.2

Original post by lady123

Got this on Thursday. I need an A. Got a D the last time :frown:

so did i ! i was shocked as i thought i had done ok :frown:

i also would like an A but i'll settle for a B

Reply 13

mattj94

Original post by TheLightBulb

Hi Matt,

They're really good!! :smile:

do you by any chance have unit 2 notes aswell please?

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Thanks!
I've not done any yet, though I will try to get them done in time for the exam.

Matt

Reply 14

TheLightBulb

Original post by mattj94

Thanks!
I've not done any yet, though I will try to get them done in time for the exam.

Matt

Thank you Matt !! :biggrin:

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Reply 15

lady123

Original post by Tabby.1.2

so did i ! i was shocked as i thought i had done ok :frown:

i also would like an A but i'll settle for a B

I was so certain I was gonna get an A too but...

Reply 16

Matt_dragon

I'm retaking it as well. Got a D in January even though I thought I did LOADS better. I really REALLY need an A.

Reply 17

sarah.102

Original post by x-Sophie-x

I'm taking this exam for the first time. Because our stupid school insists we get better results if we do both units in the summer Urgh! :angry:

I hate periodicity the most :frown:

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Same for me, so much more pressure having both unit exams together

Reply 18

Paulineuh

Original post by SharminaSyeda

The more shielding (due to more electron shells) = higher atomic radius = further away the outer electrons are from the nucleus (so lower attraction between e- and nucleus) = the lower the IE

I'm re-sitting this exam too, I got an E in the January paper, I was surprised seeing as I really love periodicity questions and all however, I do think the equations are my weak spot :frown:

Does anybody know how many decimal places they want the answers to? *sucks at Maths*

Original post by mattj94

I have created revision notes for this exam and they can be found on my website http://www.mattsrevision.com/chemistry-in-action/

Matt

These are really helpful! Hopefully you can put up Unit 2 ones too! :biggrin:

Thank you Matt! :smile:

(edited 10 years ago)

Reply 19

gooner1886

Original post by Paulineuh

Does anybody know how many decimal places they want the answers to? *sucks at Maths*

These are really helpful! Hopefully you can put up Unit 2 ones too! :biggrin:

Thank you Matt! :smile:

Re. decimal places - they usually tell you how many they want e.g. when calculating RAM they say "answer to 1 decimal place"

For the moles questions I would say its a safe bet to give your answers to 3 significant figures. They have penalised less than 3 in the past :smile: