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AQA A-level Chemistry 7405 - Paper 3 - 19th June 2019

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Do you reckon 184 will get me an A?
Original post by honeybooooo
Do you reckon 184 will get me an A?


Last year was 198 for A , 2017 204. So maybe around the 190 region for an A
(edited 4 years ago)
i feel thaat moles calirometry kinetics will come up so i will focus on these and tirtrations and mulltiple choice questions
a
Reply 23
Avatar for kaiju78
kaiju78
8
Are there any more practicals we need to know aside from these:
1) Volumetric solution/acid-base titration
2) Measurement of enthalpy change using calorimeter
3) Calculating rate of reaction (either by time for cross to no longer be visible, measuring the change in mass at regular time intervals, measure volume of gas produced over regular time intervals)
4) Identifying cations and anions (so flame tests, looking for precipitates etc.)
5) Distillation and reflux
6) Test for alcohol, aldehyde vs ketone, alkenes and carboxylic acids.
7) Measuring rate - continuous method
8) Measuring rate - initial rates method
9) Measuring EMF in electrochemistry
10) Investigating pH changes using a pH meter
11) Separation
12) Recrystallisation
13) Measuring purity of a solid
14) Test tube reactions for identifying transition metal ions
15) Chromatography (TLC)
That’s all of them :smile:
Original post by kaiju78
Are there any more practicals we need to know aside from these:
1) Volumetric solution/acid-base titration
2) Measurement of enthalpy change using calorimeter
3) Calculating rate of reaction (either by time for cross to no longer be visible, measuring the change in mass at regular time intervals, measure volume of gas produced over regular time intervals)
4) Identifying cations and anions (so flame tests, looking for precipitates etc.)
5) Distillation and reflux
6) Test for alcohol, aldehyde vs ketone, alkenes and carboxylic acids.
7) Measuring rate - continuous method
8) Measuring rate - initial rates method
9) Measuring EMF in electrochemistry
10) Investigating pH changes using a pH meter
11) Separation
12) Recrystallisation
13) Measuring purity of a solid
14) Test tube reactions for identifying transition metal ions
15) Chromatography (TLC)
Does anyone have links to websites that have a lot of multiple choice questions or practical based questions? Would be much appreciated.
Reply 26
Avatar for kaiju78
kaiju78
8
Cheers
Original post by GoldenShade
That’s all of them :smile:
Original post by Mayonnaise2001
Does anyone have links to websites that have a lot of multiple choice questions or practical based questions? Would be much appreciated.

physics & maths tutor
there's multiple choice for most sections and quite a few practical questions too
Reply 28
Avatar for ml2001
ml2001
9
Would anyone be able to explain how to work out this question? The answer is 38.5cm^3. D5E701C3-92D3-42B8-9B55-BA6652E0DB24.jpg.jpeg
Original post by ml2001
Would anyone be able to explain how to work out this question? The answer is 38.5cm^3. D5E701C3-92D3-42B8-9B55-BA6652E0DB24.jpg.jpeg

Do you get an equation in the previous parts of this question?
Reply 30
Avatar for ml2001
ml2001
9
Original post by Jade10969
Do you get an equation in the previous parts of this question?


Oh yeah sorry should’ve added it, you were given the reversible reaction:
Ethanoic acid + ethanol —-> ethyl ethanoate + water
Chemistry has stressed me out so much idk if i can make it till the end
find the moles of each substance at equilibrium in terms of x, e.g. the products would both have moles x at eqbm and the reactants would have moles of 0.0435-x at eqbm

then calculate what x is using the kc value given, write out the kc expression and make it equal to 4.07
sq rt it
rearrange it to find x which is 0.0291
use x to find the moles of acid in total at eqbm which is 0.0435 - 0.0291 plus moles of H2SO4 catalyst (take into account that H2SO4 is diprotic)
total moles of acid comes out to be 0.0154
divide this by the conc of NaOH which is 0.400 and x by 1000 to get 38.5
Original post by ml2001
Oh yeah sorry should’ve added it, you were given the reversible reaction:
Ethanoic acid + ethanol —-> ethyl ethanoate + water
What batteries do we need to know
Can anyone explain why 23 is A? Don't see how it's a base
Also why 31 is B not D?
much appreciated :smile:
Screen Shot 2019-06-15 at 17.23.08.png53.3KB
Screen Shot 2019-06-15 at 17.26.06.png46.3KB
HNO3 acts as a bronsted lowry base because it accepts a proton from H2SO4 and releases OH- ions.
Ba(OH)2 and MgSO4 form BaSO4 which is insoluble therefore would produce largest mass of a solid, as it doesnt produce any other products, D will also produce NaOH.

Original post by lollypenguin
Can anyone explain why 23 is A? Don't see how it's a base
Also why 31 is B not D?
much appreciated :smile:
non-rechargeable, rechargeable, lithium cell, hydrogen-oxygen fuel cell
Original post by Sarah2019_2020
What batteries do we need to know
https://www.physicsandmathstutor.com/chemistry-revision/a-level-aqa/practical-skills/
Original post by Mayonnaise2001
Does anyone have links to websites that have a lot of multiple choice questions or practical based questions? Would be much appreciated.
i think u are about right, there was so much up roar about paper 1 so i deffo think they will be alot lower, especially as the tests were alot harder this yr than last yr.
Original post by honeybooooo
Do you reckon 184 will get me an A?
how do you do this?
Screen Shot 2019-06-15 at 17.59.05.png42.2KB

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