Pearson Edexcel International Advanced Level Chemistry International Advanced Level
UNIT 4: Rates, Equilibria and Further Organic Chemistry QP JANUARY 2024
[Document subtitle]
user [Date] [Course title]
, Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 8 January 2024
reference WCH14/01
Morning (Time: 1 hour 45 minutes) Paper
Chemistry
International Advanced Level
UNIT 4: Rates, Equilibria and Further Organic
Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Pearson Edexcel International Advanced Level Chemistry International Advanced Level
UNIT 4: Rates, Equilibria and Further Organic Chemistry QP JANUARY 2024
• Use black ink or ball-point pen.
• If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
• centre number and candidate number.
• Answer all questions.
Answer the questions in the spaces provided
Instructions
– there may be more space than you need.
• The total mark for this paper is 90.
• The marks for each question are shown in brackets
• – use this as a guide as to how much time to spend on each question.
In the question marked with an asterisk (*), marks will be awarded for your ability to
structure your answer logically, showing how the points that you make are related or
• follow on from each other where appropriate. A Periodic Table is
Information
printed on the back cover of this paper.
• Read each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Try to answer every question.
• Check your answers if you have time at the end.
Advice
Turn over
P73456A
©2024 Pearson Education Ltd.
*P73456A0128*
S:1/1/1/
, SECTION A (T
Answer ALL the questions in this section.
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1 The equation for a reaction is shown.
A(g) + 2B(g) 3C(s) + 4D(g)
(a) Some collisions between reactant molecules do not lead to the
formation of products.
What is the best explanation for this?
(1)
A the reactant concentrations are too low
B the collisions do not have sufficient energy
C the reaction is at equilibrium
D the molecules do not collide in the correct ratio
(b) What are the units of the equilibrium constant, Kp , for this reaction?
(1)
A atm
B atm–1
C atm4
D atm–4
(Total for Question 1 = 2 marks)
2 Nitrogen(V) oxide, N2O5 , decomposes in a first order
reaction. At 45 °C, the half-life for this reaction is 1400 s.
In an experiment, the initial concentration of nitrogen(V) oxide is 1.0 mol dm –
3
. What is the concentration, in mol dm–3, of nitrogen(V) oxide after 4200 s?
A 0.875
B 0.500
C 0.250
D 0.125
,DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
UNIT 4: Rates, Equilibria and Further Organic Chemistry QP JANUARY 2024
[Document subtitle]
user [Date] [Course title]
, Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel International Advanced Level
Monday 8 January 2024
reference WCH14/01
Morning (Time: 1 hour 45 minutes) Paper
Chemistry
International Advanced Level
UNIT 4: Rates, Equilibria and Further Organic
Chemistry
You must have: Total Marks
Scientific calculator, Data Booklet, ruler
Pearson Edexcel International Advanced Level Chemistry International Advanced Level
UNIT 4: Rates, Equilibria and Further Organic Chemistry QP JANUARY 2024
• Use black ink or ball-point pen.
• If pencil is used for diagrams/sketches/graphs it must be dark (HB or B).
• Fill in the boxes at the top of this page with your name,
• centre number and candidate number.
• Answer all questions.
Answer the questions in the spaces provided
Instructions
– there may be more space than you need.
• The total mark for this paper is 90.
• The marks for each question are shown in brackets
• – use this as a guide as to how much time to spend on each question.
In the question marked with an asterisk (*), marks will be awarded for your ability to
structure your answer logically, showing how the points that you make are related or
• follow on from each other where appropriate. A Periodic Table is
Information
printed on the back cover of this paper.
• Read each question carefully before you start to answer it.
• Show all your working in calculations and include units where appropriate.
• Try to answer every question.
• Check your answers if you have time at the end.
Advice
Turn over
P73456A
©2024 Pearson Education Ltd.
*P73456A0128*
S:1/1/1/
, SECTION A (T
Answer ALL the questions in this section.
You should aim to spend no more than 20 minutes on this section.
For each question, select one answer from A to D and put a cross in the box . If you change
your mind, put a line through the box and then mark your new answer with a cross .
1 The equation for a reaction is shown.
A(g) + 2B(g) 3C(s) + 4D(g)
(a) Some collisions between reactant molecules do not lead to the
formation of products.
What is the best explanation for this?
(1)
A the reactant concentrations are too low
B the collisions do not have sufficient energy
C the reaction is at equilibrium
D the molecules do not collide in the correct ratio
(b) What are the units of the equilibrium constant, Kp , for this reaction?
(1)
A atm
B atm–1
C atm4
D atm–4
(Total for Question 1 = 2 marks)
2 Nitrogen(V) oxide, N2O5 , decomposes in a first order
reaction. At 45 °C, the half-life for this reaction is 1400 s.
In an experiment, the initial concentration of nitrogen(V) oxide is 1.0 mol dm –
3
. What is the concentration, in mol dm–3, of nitrogen(V) oxide after 4200 s?
A 0.875
B 0.500
C 0.250
D 0.125
,DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
