The Oxford School
YEAR 9 CHEMISTRY REVISION WORKSHEET
1.
Label the apparatus shown in the diagram below.
2. Match the apparatus to the mixture it could separate.
sieve
magnet
colander
filter paper
iron nails and sand
flour and rice
undissolved coffee granules and coffee
cooked pasta and water
3. Wool is a natural product. Name one thing that is made from wool.
4. Tick which of the following examples is not scientific evidence.
a suspect’s fingerprint
a suspect’s DNA sample
a suspect’s comments
a suspect’s blood sample
(1 mark)
5. Police forensic scientists need to separate a mixture of sand and water. They need to keep both parts of
the mixture.
a Circle the apparatus below that they should use.
evaporating basin
Bunsen burner
filter paper and funnel
boiling tube
b State what the scientists will see when they carry out the separation.
(2 marks)
6. A barrel of an unknown substance in a disused factory is thought to be acid. Tick three
statements that describe safe ways of dealing with the suspected acid.
Smell the acid several times to try and identify it.
Call a hazardous-waste expert.
Cover any spills with sand or soil.
Pour the acid down the drain to stop anyone
touching it.
Carefully add an alkali to it to neutralise it and
produce a harmless salt.
(3 marks)
7.
Ink can be separated using the following apparatus.
a. Circle the correct name of the separation technique this apparatus is used for.
paper chromatography
filtering
sieving
decanting
(1 mark)
b On the diagram above, place an X where the ink would be placed before it is separated.
(1 mark)
8. a Match the sentence beginnings to the correct endings.
Sisal is a natural product
do not catch fire easily.
Wool is a natural product
from plants.
Wool and sisal are
from sheep.
Wool and sisal are soft and
suitable for making carpets.
(3 marks)
b Wool and sisal carpets are biodegradable. State what it means if something is biodegradable.
(1)
9.
A suspect tore his top and cut his arm when he ran from a break-in. The fibres and the
blood may be a clue to his identity. Suggest a method for separating the clothing fibres
from the blood.
(4 marks)
10. A corrosive substance was thrown during a protest. The fire brigade tested it and obtained
the following results.
Colour with red litmus paper
blue
Colour with blue litmus paper
stayed blue
Colour with universal indicator paper
blue
a Suggest what type of substance was thrown.
(1 mark)
b Suggest the pH of the substance.
(1 mark)
c Give the name of a substance that could be used to neutralise this substance.
(1 mark)
11. A sample of ink was taken from a ransom note and another sample was taken from a
suspect’s pen. Both samples were separated using chromatography. The resulting
chromatograms are shown below.
Compare the two chromatograms and give two facts that you can conclude about the two
ink samples.
(2 marks)
12. A lorry carrying sulfuric acid overturned and spilled acid onto the motorway. The fire brigade
was advised to neutralise it with sodium hydroxide.
a Write a word equation for the reaction the fire brigade carried out.
(1 mark)
b Suggest why fire brigades may choose to neutralise spilt acid and why it would be
important to identify the products of any neutralisation reaction before carrying it out.
(2 marks)
13. Explain two properties of both wool and sisal that make them suitable for use in carpets.
(2 marks)
14. Marcus wants to test the reactivity series of metals. He decides to test the order of
reactivity of potassium, iron, and gold with water. Design an experiment Marcus could
use to test the reactivity series of potassium, iron, and gold. Describe what you would
expect Marcus’ findings to be.
In this question you get marks for how well your answer is written.
You will get marks for:



spelling
grammar
organising your ideas and information clearly using key scientific words.
(6 marks)
15. a. What’s Rf value.
(1 mark)
b. Calculate Rf of red, blue and green color
Rf of red color:
Rf of blue color:
Rf of green color:
(3 marks)