Chemistry A-level - Specimen Paper 1 | PMT Education

These are model solutions for Chemistry A-level Paper 1, specimen series.

You can download a PDF copy of the solutions, as well as the question paper and mark scheme for this and all other Chemistry A-level Paper 1 papers here:

0:00:00 Intro
0:00:10 Question 1 - Atomic Structure and Isotopes
0:01:55 Question 2 - Group 2
0:05:55 Question 3 - Chemical Equilibrium
0:09:05 Question 4 - Enthalpy Changes
0:13:21 Question 5 - Rates of Reaction
0:16:03 Question 6 - Bonding
0:18:49 Question 7 - Periodicity
0:20:53 Question 8 - Arrhenius' Equation
0:22:48 Question 9 - Acids, Bases and Buffers
0:24:12 Question 10 - Lattice Enthalpy
0:27:01 Question 11 - Redox
0:30:00 Question 12 - Equilibrium Constants
0:33:00 Question 13 - Transition Elements
0:34:50 Question 14 - Transition Elements
0:39:26 Question 15 - Factors Affecting Kc
0:42:12 Question 16 - Equilibrium Constant Kp
0:58:34 Question 17 - Rates of Reaction
1:07:57 Question 18 - Enthalpy and Entropy
1:15:06 Question 19 - Lattice Enthalpy
1:24:45 Question 20 - Acids, Bases and Buffers
1:38:41 Question 21 - Redox and Electrode Potentials
1:45:12 Question 22 - Transition Elements

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[matthewbarnfied]

in Q20 c ii the H+ is not just 1.176 its x10^-5. this really confused me as you did not state that in the pH eqation and you clearly didn't put that in a calculator. just thought i would let you know incase anyone else has the same issue

[HannaKhalil]

Hi, for question 20 a) when I multiply 0.0302 with 250x10^-3, I don't get 0.0755 but I do get 0.00755. The mark scheme says you miltiply 250x10^-3 with 0.302 instead - why is this?

[oscarcroft]

In 20. c) ii) could someone please explain why there is still a concentration of OH- after it has reacted with the acid? (I'm assuming when you do n(butanoic acid) - n(NaOH) they are reacting and there would be no OH- left since butanoic acid is in excess)