Angels International College
Academic Session 2020-21
Cambridge 8 Science
Cambridge International Examinations
Cambridge Secondary 1 Checkpoint
SCIENCE
CHEMICAL REACTIONS
Assessment
45 minutes
Marks: 15
Candidates answer on the Question Paper.
Additional Materials:
Pen
Pencil
Ruler
Calculator
READ THESE INSTRUCTIONS FIRST
Write your Centre number, candidate number and name on all the work you hand in.
Write in dark blue or black pen.
You may use an HB pencil for any diagrams, graphs or rough working.
Do not use staples, paper clips, glue or correction fluid.
DO NOT WRITE IN ANY BARCODES.
Answer all questions.
You should show all your working in the booklet.
At the end of the examination, fasten all your work securely together.
The number of marks is given in brackets [ ] at the end of each question or part question.
The total number of marks for this paper is 50.
2
1. Yuri investigates the reaction of metals with acids.
He adds different metals to dilute hydrochloric acid.
The diagram shows his results.
metal A
metal B
metal C
metal D
(a) Complete the column heading and table to show Yuri’s results.
metal
A
0
B
6
C
D
[3]
(b) Describe how Yuri could improve his method to find the volume of gas produced.
Tick () the box next to the correct method.
collect the gas in a measuring cylinder
collect the gas in a test tube
repeat the experiment the same way
use a smaller piece of metal
[1]
3
(c) Yuri repeats his experiment using more concentrated acid.
Yuri makes this prediction.
If I use more concentrated
acid I will get a faster
reaction.
The diagram shows his results for his second experiment.
metal A
metal B
metal C
metal D
Is Yuri’s prediction supported by his results?
yes
no
Explain your answer.
[2]
[Turn over
4
(d) Complete the word/chemical equation for the reaction between lithium and water.
+
+
[3]
Which of these substances is an element?
Choose from lithium, water or lithium hydroxide.
.........................................................................
[1]
(e) Lithium is in Group 1 of the Periodic Table.
The diagram shows some of the elements in Group 1 of the Periodic Table.
Na
K
sodium
potassium
Rb
rubidium
Cs
caesium
Fr
francium
Describe how the reactivity of the Group 1 metals changes as you go down the group.
[1]
5
2
The diagram shows the structure of an atom.
Name the element
[2]
6. Complete these sentences about making salts.
[2]
Salts can be made by reacting metals or metal carbonates with acid.
When metals react with acid, the products are a salt and
.
When
and metal carbonates react with acid, the products are a salt,
1113/02/A/M/19
[Turn over