2024 Pearson Edexcel GCSE In Combined Science Chemistry (1SC0) Paper 1CH question paper and marking scheme (merged)

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Pearson Edexcel Level 1/Level 2 GCSE (9–1)
Friday 17 May 2024
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

• Instructure
– use this as a guide as to how much time to spend on each question.
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


Pearson Edexcel GCSE

In Combined Science Chemistry(1SC0) Paper 1CH

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, 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
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answer, put a line through the box and then mark your new answer with a cross .

1 Barium hydroxide reacts with dilute hydrochloric acid to form
barium chloride solution and water.

(a) (i) Complete the balanced equation for the reaction by adding a number in front
of HCl(aq).
(1)

Ba(OH)2(s) + ....... ..... ..... ..... .. HCl(aq)  BaCl2(aq) + 2H2O(l)

(ii) State what you would see during the reaction.
(1)

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(b) A student investigated how the pH of the mixture changed as barium hydroxide
was added to dilute hydrochloric acid.

The student used this method.
step 1 measure out 50 cm3 of dilute hydrochloric acid into a beaker using a
measuring cylinder

step 2 use a glass rod to place a drop of the acid onto a piece of
universal indicator paper and record the pH

step 3 add one spatula measure of barium hydroxide to the acid in the beaker
and stir

step 4 use the glass rod to place a drop of the mixture onto a new piece of
universal indicator paper and record the pH again

step 5 repeat steps 3 and 4 until there is no further change in the pH.
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, (i) Name a piece of equipment that could be used to measure the pH of a
substance more accurately than universal indicator paper.
(1)




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(ii) Explain why, in step 3, the mixture was stirred after adding the
barium hydroxide.
(2)

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(iii) Figure 1 shows the student’s results.




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number of spatula measures
pH of mixture
of barium hydroxide

0 1

1 1

2 1

3 1

4 3

5 8

6 12

7 13
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8 13

Figure 1




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