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
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*P74438A0220*
BLANK PAGE
2
, 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 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)
(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.
easure out 50 cm3 of dilute hydrochloric acid into a beaker using a
step 1 m
measuring cylinder
step 2 u
se a glass rod to place a drop of the acid onto a piece of
universal indicator paper and record the pH
step 3 a dd one spatula measure of barium hydroxide to the acid in the beaker
and stir
step 4 u
se 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.
3
*P74438A0320* Turn over
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