Hey everyone!
D
I was thrilled with today's paper as there was not a
big challenge. I hope it went well and you get the grades you want.
The thing with this paper is their was a lot of 2-3 mark answers and rather than I write down what I wrote, we
construct this mark scheme together?
I copied all questions and a few
definite answers on Tracing paper, so these are 1000000000% Reliable.
----------------------AQA CHEMISTRY HIGHER TIER UNOFFICIAL MARK SCHEME----------------------------
1)
a) You were asked to calculate the mean
Answer: 5.75
ii) Question: Suggest Improvement to the experiment.
(This question came up in a past paper, so
I shall post all the definite answer's like last year).
Answers (Mark scheme from June 2015 paper):
improvement:
use a plastic / polystyrene cup or add a lid reason - must be linked reduce / stop heat loss (accept use lagging/insulation
).
OR
improvement:use a digital thermometer (allow use a data logger
) reason - must be linked more accurate or easy to read or stores data (allow more precise or more sensitive
).
Ignore:
>ignore more reliable
>ignore improvements to method,eg take more readings
Possible answers:
b)You were given some Data and you had to post the Links between the Mass and Final Temp, here's the data.
Mass (g) Final Temperature in degrees Celsius
2.0 --------------------------------------- 21.5
4.0 --------------------------------------- 23.0
6.0 --------------------------------------- 24.5
8.0 --------------------------------------- 26.0
10.0 --------------------------------------- 26.6
12.0 --------------------------------------- 26.6
14.0 --------------------------------------- 26.6
Answer:
2)
a)Endothermic
b)You had to work out the percentage of Nitrogen in NH3
Answer: 82.4%
c)
i) 7
ii) Tick the correct box
Answer: H+ + OH- -> H20
iii) Ammonium and Chlorine react to produce
Answer: Ammonium Chloride
d) This was the 6 mark question. Basically, here's an overview of an answer to get points.
Answer: 200kg of Ammonium Nitrate would be chosen, because it has a high yield and high profit, and minimal deposit into the river when washed away.
(I think to get high marks in this, you need to include numbers in your answer)
3)
a)
i)Explain why Oxygen has a mass of 16.
Answer:
ii) 12/6
C and 14/6
C are Isotopes of Carbon. Explain why include Sub-atomic particles in your answer.
Answer:
b)
i) Asks you what type of bonding is in the water molecule.
Answer: Covalent bond
ii)
Answer: Water has no overall charge.
c)
i)
Answer: Nano particles are 100x bigger than an atom.
ii)
Answer: Nano particles have a larger surface area than powders, making them better catalysts.
4)
a) Why did the solution go cloudy?
Answer: The solid sulphur is a precipitate from the reaction.
b)State 2 things that should be done to keep this a fair test:
Answer:
1)
2)
c)How does the increasing temperature affect the rate of reaction? You must refer to sub-atomic particles and collisions in your answer.
Answer:
d)
Answer: Change volume of Hydrochloric Acid
5)
a)When Magnesium reacts with Chlorine. Explain in terms of particles what happens etc.
b)
i)
Answer: Electrons and Ions have to be molten because they are more free to move to the oppositely charged electrode.
ii)Why does Magnesium move to the Negative Electrode in electrolysis? (3 Marks)?
Answer:
iii)
Answer: Hydrogen
iv)
Answer: Hydrogen is less reactive than Magnesium.
b)
Answer: 2CL------>CL2 +
2e-
c)Why are metals bendy? (2 marks)
Answer: They consist of layers of atoms. These layers can slide over one another when the metal is bent, hammered or pressed. (BBC Bitesize answer)
6)
a) Why does copper conduct Electricity?
Answer:
b) Why is Diamond Hard?
Answer:
c)Why are Thermosetting Polymers used as Saucepan handles instead of Thermoplastics (Thermosoftening)?
Answer:
As you can see I have left a lot of Gaps, Simply because I can not be bothered to put in my answer.
Have an answer to include? say @Bulletzone and Tell me the answer to the question/s you have.
Do any of you disagree? Just say Bulletzone and tell me why.
PEACE!
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D
