Please check the examination details below before entering your candidate information
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 1/Level 2 GCSE (9–1)
Monday 22 May 2023
Morning (Time: 1 hour 45 minutes) Paper
reference 1CH0/1H
Chemistry
PAPER 1
Higher Tier
You must have: Total Marks
Calculator, ruler
Instructions
•• Use black ink or ball-point pen.
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
– there may be more space than you need.
•• Calculators may be used.
Any diagrams may NOT be accurately drawn, unless otherwise indicated.
• You must show all your working out with your answer clearly identified at the
end of your solution.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
In questions marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow on from each other where appropriate.
• There is a periodic table on the back cover of the paper.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end. Turn over
P72631A
©2023 Pearson Education Ltd.
N:1/1/1/1/1/1/1/
*P72631A0132*
, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 (a) Figure 1 shows information about two isotopes of hydrogen, A and B.
Complete the table to show the number of subatomic particles in each isotope.
(2)
isotope A isotope B
atomic number 1 1
mass number 1 2
number of protons
.............................................................. ..............................................................
number of electrons
.............................................................. ..............................................................
number of neutrons
.............................................................. ..............................................................
Figure 1
(b) Hydrogen gas and oxygen gas are used in a hydrogen–oxygen fuel cell.
Separate containers of hydrogen and oxygen are used to supply the gases.
A student tests the voltage supplied by the fuel cell every 15 minutes.
The results are shown in Figure 2.
voltage 1.2
in V
1.0
0.8
0.6
0.4
0.2
0.0
0 15 30 45 60 75 90
time in minutes
Figure 2
2
*P72631A0232*
, Describe what Figure 2 shows about how the voltage of this fuel cell varies
with time.
(2)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(c) A chemical cell is made by placing two electrodes into an aqueous electrolyte.
Figure 3 shows a chemical cell.
V
electrode
electrode
electrolyte
Figure 3
State why sodium and sulfur electrodes are not suitable for this experiment.
(2)
sodium
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
sulfur
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(Total for Question 1 = 6 marks)
3
*P72631A0332* Turn over
, 2 In an experiment, powdered calcium hydroxide was added to dilute hydrochloric acid
and the pH was measured.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
The method used was
step 1 measure 200 cm3 dilute hydrochloric acid into a beaker
step 2 add 0.1 g of powdered calcium hydroxide to the beaker
step 3 find the pH of the mixture
step 4 repeat steps 2 and 3 until the pH stops changing.
(a) State what should be done after step 2 to make sure that any reaction
is complete.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(b) Complete the word equation for the reaction.
(2)
calcium hydroxide + hydrochloric acid → .................................................................................................................................. . . . . . . . . . . . . . . . . . . . .
(c) Which row of the table shows the state symbols for powdered calcium hydroxide
and dilute hydrochloric acid in the balanced chemical equation?
(1)
calcium hydroxide hydrochloric acid
A aq l
B l aq
C s aq
D s l
4
*P72631A0432*
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 1/Level 2 GCSE (9–1)
Monday 22 May 2023
Morning (Time: 1 hour 45 minutes) Paper
reference 1CH0/1H
Chemistry
PAPER 1
Higher Tier
You must have: Total Marks
Calculator, ruler
Instructions
•• Use black ink or ball-point pen.
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
– there may be more space than you need.
•• Calculators may be used.
Any diagrams may NOT be accurately drawn, unless otherwise indicated.
• You must show all your working out with your answer clearly identified at the
end of your solution.
Information
•• The total mark for this paper is 100.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
In questions marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how the points that you make are related or
follow on from each other where appropriate.
• There is a periodic table on the back cover of the paper.
Advice
•• Read each question carefully before you start to answer it.
Try to answer every question.
• Check your answers if you have time at the end. Turn over
P72631A
©2023 Pearson Education Ltd.
N:1/1/1/1/1/1/1/
*P72631A0132*
, Answer ALL questions. Write your answers in the spaces provided.
Some questions must be answered with a cross in a box . If you change your mind about an
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
answer, put a line through the box and then mark your new answer with a cross .
1 (a) Figure 1 shows information about two isotopes of hydrogen, A and B.
Complete the table to show the number of subatomic particles in each isotope.
(2)
isotope A isotope B
atomic number 1 1
mass number 1 2
number of protons
.............................................................. ..............................................................
number of electrons
.............................................................. ..............................................................
number of neutrons
.............................................................. ..............................................................
Figure 1
(b) Hydrogen gas and oxygen gas are used in a hydrogen–oxygen fuel cell.
Separate containers of hydrogen and oxygen are used to supply the gases.
A student tests the voltage supplied by the fuel cell every 15 minutes.
The results are shown in Figure 2.
voltage 1.2
in V
1.0
0.8
0.6
0.4
0.2
0.0
0 15 30 45 60 75 90
time in minutes
Figure 2
2
*P72631A0232*
, Describe what Figure 2 shows about how the voltage of this fuel cell varies
with time.
(2)
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(c) A chemical cell is made by placing two electrodes into an aqueous electrolyte.
Figure 3 shows a chemical cell.
V
electrode
electrode
electrolyte
Figure 3
State why sodium and sulfur electrodes are not suitable for this experiment.
(2)
sodium
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
sulfur
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(Total for Question 1 = 6 marks)
3
*P72631A0332* Turn over
, 2 In an experiment, powdered calcium hydroxide was added to dilute hydrochloric acid
and the pH was measured.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
The method used was
step 1 measure 200 cm3 dilute hydrochloric acid into a beaker
step 2 add 0.1 g of powdered calcium hydroxide to the beaker
step 3 find the pH of the mixture
step 4 repeat steps 2 and 3 until the pH stops changing.
(a) State what should be done after step 2 to make sure that any reaction
is complete.
(1)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(b) Complete the word equation for the reaction.
(2)
calcium hydroxide + hydrochloric acid → .................................................................................................................................. . . . . . . . . . . . . . . . . . . . .
(c) Which row of the table shows the state symbols for powdered calcium hydroxide
and dilute hydrochloric acid in the balanced chemical equation?
(1)
calcium hydroxide hydrochloric acid
A aq l
B l aq
C s aq
D s l
4
*P72631A0432*
