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 10 minutes) Paper
reference 1SC0/1CH
Combined Science
PAPER 2
Higher 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 60.
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
P79134A
©2026 Pearson Education Ltd.
P:1/1/
*P79134A0120*
, 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) Crystals of ammonium chloride, NH4Cl, are heated.
Ammonia, NH3, and one other product form.
This is a reversible reaction.
Complete the equation for the reaction by adding
• the symbol that shows a reversible reaction in the box
• the missing product on the dotted line.
(2)
NH4Cl NH3 + .......................................................................................
(b) A student investigates a different reversible reaction using the following method.
The student is wearing gloves and safety goggles.
step 1 add 10 drops of a solution of substance Z and
10 cm3 concentrated sulfuric acid to a test tube
step 2
leave the test tube and then observe the colour of the mixture
step 3
heat the test tube strongly with a Bunsen burner
step 4
observe the new colour of the mixture.
2
*P79134A0220*
, (i) The bottle containing substance Z has the hazard symbols shown in Figure 1.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Figure 1
Which row names three of the hazards associated with substance Z?
(1)
A corrosive, explosive, flammable
B corrosive, oxidising, toxic
C harmful to the environment, explosive, toxic
D health hazard, harmful, toxic
(ii) Explain what could be done during step 3 to make it safer.
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(c) Substance Z has the formula K2Cr2O7.
Calculate the relative formula mass of K2Cr2O7.
(relative atomic masses: K = 39, Cr = 52, O = 16)
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
relative formula mass = ......................... ............... . . . . . . . . . . . . . . . . . . . . . .
3
*P79134A0320* Turn over
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 10 minutes) Paper
reference 1SC0/1CH
Combined Science
PAPER 2
Higher 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 60.
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
P79134A
©2026 Pearson Education Ltd.
P:1/1/
*P79134A0120*
, 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) Crystals of ammonium chloride, NH4Cl, are heated.
Ammonia, NH3, and one other product form.
This is a reversible reaction.
Complete the equation for the reaction by adding
• the symbol that shows a reversible reaction in the box
• the missing product on the dotted line.
(2)
NH4Cl NH3 + .......................................................................................
(b) A student investigates a different reversible reaction using the following method.
The student is wearing gloves and safety goggles.
step 1 add 10 drops of a solution of substance Z and
10 cm3 concentrated sulfuric acid to a test tube
step 2
leave the test tube and then observe the colour of the mixture
step 3
heat the test tube strongly with a Bunsen burner
step 4
observe the new colour of the mixture.
2
*P79134A0220*
, (i) The bottle containing substance Z has the hazard symbols shown in Figure 1.
DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA DO NOT WRITE IN THIS AREA
Figure 1
Which row names three of the hazards associated with substance Z?
(1)
A corrosive, explosive, flammable
B corrosive, oxidising, toxic
C harmful to the environment, explosive, toxic
D health hazard, harmful, toxic
(ii) Explain what could be done during step 3 to make it safer.
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
(c) Substance Z has the formula K2Cr2O7.
Calculate the relative formula mass of K2Cr2O7.
(relative atomic masses: K = 39, Cr = 52, O = 16)
(2)
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . .. .. .. .. .. .. .. .. .. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ............................................................................................................................................ ................ . . . . . . . . . . . . . . . . . . . .
relative formula mass = ......................... ............... . . . . . . . . . . . . . . . . . . . . . .
3
*P79134A0320* Turn over
