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 18 May 2026
Morning (Time: 1 hour 45 minutes) Paper
reference 1CH0/1F
Chemistry
PAPER 1
Foundation Tier
You must have: Total Marks
Calculator, ruler, Periodic Table (enclosed)
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.
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
P79129A
©2026 Pearson Education Ltd.
P:1/1/1/1/1/1/1/1/1/1/
*P79129A0128*
, 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 Potassium hydroxide is used in some fuel cells.
(a) The formula of potassium hydroxide is KOH.
State the number of elements in KOH.
(1)
....................................................................... . . . . . . . . . . . . . . . . . . . . . .
(b) Figure 1 shows three graphs of how voltage changes with time.
graph A graph B graph C
voltage voltage voltage
time time time
Figure 1
(i) In a fuel cell, a constant voltage is produced if the fuel is supplied all the time.
State which graph represents a fuel cell.
(1)
....................................................................... . . . . . . . . . . . . . . . . . . . . . .
(ii) Complete the word equation for the overall reaction in a hydrogen‑oxygen
fuel cell.
(2)
hydrogen + . . . . . . . . . . . . . . . . . . . . ................................................... → .......................................................................
2
*P79129A0228*
, (c) Potassium hydroxide reacts with acids.
The equation for one of the reactions is
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
KOH + HCl → KCl + H2O
(i) Name each product.
(2)
KCl ..................................................................................................... ............... . . . . . . . . . . . . . . . . . . . . . .
H2O .................................................................................................................. . . . . . . . . . . . . . . . . . . . . . .
(ii) Calculate the atom economy for the formation of the product KCl.
relative formula mass of wanted product
atom economy = ×100
totall relative formula mass of all products
(relative formula mass of KCl = 74.5,
total relative formula mass of all products = 92.5)
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
atom economy = .............................................. . . . . . . . . . . . . . . . . %
(Total for Question 1 = 8 marks)
3
*P79129A0328* Turn over
, 2 An ink contains a blue dye and water.
(a) Which of these describes the ink?
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(1)
A an element
B a compound
C a mixture
D a salt
(b) The ink is investigated using distillation.
The apparatus is shown in Figure 2.
conical flask
ink C
heat
Figure 2
(i) Use words from the box to complete the sentences.
You may use each word once, more than once or not at all.
(3)
Bunsen burner beaker blue dye bung candle
conical flask ink match test tube water
The apparatus should be heated using a ................................................................................................... ................ . . . . . . . . . . . . . . . . . . . . .
The liquid labelled C is . . . . . . . . ........................................................................................................................................... ................ . . . . . . . . . . . . . . . . . . . . .
Liquid C is collected in a . . . ........................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . . .
4
*P79129A0428*
Candidate surname Other names
Centre Number Candidate Number
Pearson Edexcel Level 1/Level 2 GCSE (9–1)
Monday 18 May 2026
Morning (Time: 1 hour 45 minutes) Paper
reference 1CH0/1F
Chemistry
PAPER 1
Foundation Tier
You must have: Total Marks
Calculator, ruler, Periodic Table (enclosed)
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.
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
P79129A
©2026 Pearson Education Ltd.
P:1/1/1/1/1/1/1/1/1/1/
*P79129A0128*
, 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 Potassium hydroxide is used in some fuel cells.
(a) The formula of potassium hydroxide is KOH.
State the number of elements in KOH.
(1)
....................................................................... . . . . . . . . . . . . . . . . . . . . . .
(b) Figure 1 shows three graphs of how voltage changes with time.
graph A graph B graph C
voltage voltage voltage
time time time
Figure 1
(i) In a fuel cell, a constant voltage is produced if the fuel is supplied all the time.
State which graph represents a fuel cell.
(1)
....................................................................... . . . . . . . . . . . . . . . . . . . . . .
(ii) Complete the word equation for the overall reaction in a hydrogen‑oxygen
fuel cell.
(2)
hydrogen + . . . . . . . . . . . . . . . . . . . . ................................................... → .......................................................................
2
*P79129A0228*
, (c) Potassium hydroxide reacts with acids.
The equation for one of the reactions is
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
KOH + HCl → KCl + H2O
(i) Name each product.
(2)
KCl ..................................................................................................... ............... . . . . . . . . . . . . . . . . . . . . . .
H2O .................................................................................................................. . . . . . . . . . . . . . . . . . . . . . .
(ii) Calculate the atom economy for the formation of the product KCl.
relative formula mass of wanted product
atom economy = ×100
totall relative formula mass of all products
(relative formula mass of KCl = 74.5,
total relative formula mass of all products = 92.5)
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
atom economy = .............................................. . . . . . . . . . . . . . . . . %
(Total for Question 1 = 8 marks)
3
*P79129A0328* Turn over
, 2 An ink contains a blue dye and water.
(a) Which of these describes the ink?
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
(1)
A an element
B a compound
C a mixture
D a salt
(b) The ink is investigated using distillation.
The apparatus is shown in Figure 2.
conical flask
ink C
heat
Figure 2
(i) Use words from the box to complete the sentences.
You may use each word once, more than once or not at all.
(3)
Bunsen burner beaker blue dye bung candle
conical flask ink match test tube water
The apparatus should be heated using a ................................................................................................... ................ . . . . . . . . . . . . . . . . . . . . .
The liquid labelled C is . . . . . . . . ........................................................................................................................................... ................ . . . . . . . . . . . . . . . . . . . . .
Liquid C is collected in a . . . ........................................................................................................................................................... . . . . . . . . . . . . . . . . . . . . . .
4
*P79129A0428*
