AQA A Level Chemistry (2420) Unit 2 10th June 2016 (Resit)

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Too sad? I was revising the second I came out :laugh:

I took all my revision with me. I'll wallow when my exams are up and my parents stop fighting over what colour to paint the bloody bathroom. Can't afford to before then.

Ahahaha! Damn I guess you're right, I should revise for my S2 Maths and Chem 4 starting now

Reply 81

oliviaprestonbar

Please someone make an unofficial mark scheme!!!

Reply 82

samim_s

But the question for enthalpy of formatioj had the data for combustion, wouldn't entalpy of formation would be the opposite of the enthalp of combustion eg if combustion is -350 then formation would be 350 ?? Or did i make that rule up in the exam myself 😂😂😂

Reply 83

Nataxz_9

Unofficial mark scheme anyone?

Reply 84

t_as098

Original post by arronpile

what was the two observations when magnesium reacted with steam
and i thought the equation is mg + h2o ---> mgo + h2

Bright white flame and effervescence/fizzing

Reply 85

t_as098

Original post by Rid123

The strangest question i thought was the 4marker on measuring the rate if change of the hydrolysis of the two haloalkanes, i described the experiment where you put a black cross on a peice of paper beneth both reactions and time how long it takes for the crosses to disapear for each due to the ppt forming, keeping amounts and concentrations the same for fairness , do you think this will be worth any marks?

I think you will get marks for the fairness points (i wrote that two)

Reply 86

t_as098

Original post by davgen7

Guys for the q on the magnesium reaction do you think flames and precipitate will be sufficient? I put white ppt at first but crossed the white out in case it was the wrong colour and talked myself out of a mark

the specific answer would have been bright white flame and white ppt but you might still get the marks

Reply 87

t_as098

Original post by emily1414xo

I put Mg(OH)2 and H2, observations as white ppt and bubbles of gas, but people seem to be getting different :s-smilie:

Posted from TSR Mobile

It was the reaction between magnesium and steam so MgO and H2 would have been produced. Fizzing, bright white flame were the observations i wrote.

Reply 88

t_as098

Original post by arronpile

what does aqueous barium chloride and magnesium nitrate form and what is the observation

I think for that question they wanted you to write the equation for barium chloride with the silver nitrate to form AgCl white ppt.
The reaction you stated would have no visible change

Reply 89

User2334541

Original post by t_as098

It was the reaction between magnesium and steam so MgO and H2 would have been produced. Fizzing, bright white flame were the observations i wrote.

Dude, did you just say 'bright white flame'? That is completely incorrect. You get that when you burn it under Oxygen, NOT with H20 -_-

Reply 90

Dannyhoward01

Original post by User2334541

Dude, did you just say 'bright white flame'? That is completely incorrect. You get that when you burn it under Oxygen, NOT with H20 -_-

It's really not wrong mate, you get a white flame when you add oxygen or steam, although the flame is brighter when you add O2

(edited 7 years ago)

Reply 91

im.a.witch

Original post by Scitty

I can definitely sympathise with her. I can feel my place at vet school being torn away. :frown:

What did everyone get for mechanisms ?

Reply 92

Chocofudge123

Is their an unofficial mark scheme

Posted from TSR Mobile

Reply 93

im.a.witch

Original post by Chocofudge123

Is their an unofficial mark scheme

Posted from TSR Mobile

What did you get for mechanisms ?

Reply 94

Engineerrookie

Original post by Chocofudge123

Is their an unofficial mark scheme

Posted from TSR Mobile

Doesn't look like it :/

Reply 95

Chocofudge123

We need to make one

Posted from TSR Mobile

Reply 96

Chocofudge123

Can anyone remember all the questions and the marks per question?

Posted from TSR Mobile

Reply 97

t_as098

Original post by Medibananas

It was combustion data, so isn't that reactants-products??

Posted from TSR Mobile

Yh that's what i thought, with combustion data it's reactants-products

Reply 98

Bigboss27

For that 4 marker method question couldnt you also add dilute nh3 to it and time how long it takes for each compound to completely dissolve ? Then i said this would be a fair test as there is no discrepancy as to when the compound completely dissolves Surely that should get one mark as it is a potential method, it stated that when adding agno3 a white ppt is formed it never actually said you had to form a white ppt in ur method

(edited 7 years ago)

Reply 99

chzm

hi, hope your chem exam went well! Im an A2 student and I printed off all the past questions from past papers for the topics Inorganic reactions, periodicity and test tube reactions, and also attached the mark schemes to these questions, then stapled them into separate booklets according to topic. I didnt get round to completing them so if anyone wants them pm me and i can post them out to you if you like. I understand you can print them off yourselves however it would save time for you i guess (so i thought id see if they could be of any use before i binned them) Also, I'm selling my Collins Unit 1, 2, 4, and 5 student support materials books, and these books were literally the only thing i used at A level to help me through the course. Although I know the AQA specification has changed this year so I don't know how much use these resources will be as I havent seen the new spec! but please let me know if you're interested :-) good luck with A2 (though im sure you're all bright sparks who don't need it!!)