KS3 Science Homework Pack 2
Homework 7
Classifying materials – 7: Separation methods
1
Read the sentences below:
When copper sulphate is dissolved in water in a beaker, a bright blue liquid or
solution is formed. If copper sulphate is added until no more will dissolve, a
saturated solution is formed. Some blue crystals will remain at the bottom of
the beaker.
a
b
Choose words from the sentences above to answer the following questions.
i
What was the solvent used?...................................................................... (1)
ii
What was the solute used? ...................................................................... (1)
iii
What has happened to the copper sulphate? ............................................ (1)
i
What would you call the bright blue liquid? ............................................... (1)
ii
What would you call the liquid at the end of the experiment?
............................................................................................................................ (1)
2
Below are drawings of apparatus you could use to separate some mixtures.
Put in the table the letter of the apparatus you would choose to do each job.
A
B
D
E
Job
C
F
,
,
,,
,,
Apparatus
Separating vegetable oil and water
Separating the colours in a blot of ink
Separating some iron nails from sand
Getting salt from a solution of salty water
Getting water from a solution of ink
Getting sand from a mixture of sand and water
Pearson Publishing, Chesterton Mill, French’s Road, Cambridge CB4 3NP
(6)
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KS3 Science Homework Pack 2
3
4
Homework 7 (continued)
Four methods of separating substances are shown below. By using a ruled line
show which substances they can be used to separate:
(4)
Distillation
•
•
Sand and salt water and collect both
Filtration
•
•
Sugar and water and collect sugar only
Chromatography
•
•
Soluble ink and water and collect both
Evaporation
•
•
Soluble coloured inks
A student used chromatography to find out which colourings were used in her
favourite sweets. The diagrams show some of her results:
Yellow
sweet
Red
sweet
Purple
sweet
Green
sweet
Orange
sweet
a
Give the colour of a sweet which contains only one colouring. .......................... (1)
b
Name two sweets which contain one of the same colouring. ............................ (1)
c
Fill in the results you would expect for the orange sweet.
d
Which liquid would be used to separate these colourings? ............................... (1)
5
The apparatus in the diagram is used
to obtain pure water from impure water.
a
What temperature would the
thermometer show?
.................................................... (1)
b
(2)
Thermometer
A
Impure
water
What is the function of the piece of
apparatus labelled A?
Cold water
from tap
Liquid C
.................................................................................................................................
............................................................................................................................ (1)
c
What is the name of the apparatus labelled A? .................................................. (1)
d
What is liquid C? ................................................................................................. (1)
e
Give the name of the process which purifies water in this way.
............................................................................................................................ (1)
Total marks = 25
Pearson Publishing, Chesterton Mill, French’s Road, Cambridge CB4 3NP
15
KS3 Science Homework Pack 2
Homework 8
Classifying materials – 8: Metals and non-metals
1
Fill in the table below by ticking to show which properties are typical of metals
and which of non-metals:
Property
Metal
Non-metal
Shiny
Conducts heat well
Conducts electricity well
Feels cold
Feels warm
Brittle
Dents when hit
Dense
Less dense
Oxide is acidic
Oxide is basic
Oxide is solid
Oxide is gas or liquid
(13)
2
Here are some uses of materials. For each one, say if a named metal must be
used, or a named non-metal or if either would be suitable. Explain your answer
in each case.
a
tent pole
.................................................................................................................................
.................................................................................................................................
b
electrical power line
.................................................................................................................................
.................................................................................................................................
c
electrical cable insulation
.................................................................................................................................
.................................................................................................................................
d
bike frame
.................................................................................................................................
............................................................................................................................ (8)
Pearson Publishing, Chesterton Mill, French’s Road, Cambridge CB4 3NP
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KS3 Science Homework Pack 2
3
a
Homework 8 (continued)
Different elements have different properties, some of which are shown below:
•
Electrical insulator
•
Good thermal conductor
•
Poor thermal conductor
•
Melting point above room temperature
•
Good electrical conductor
•
Magnetic
•
Boiling point -153°C
•
Melting point 3422°C
Magnesium is a metal. Give two properties of magnesium from the list above. (2)
1 ...............................................................................................................................
2 ...............................................................................................................................
b
Krypton is a gas used inside a light bulb. Give two properties of krypton from the
list above which make it a good material to use.
(2)
1 ...............................................................................................................................
2 ...............................................................................................................................
c
Tungsten is used to make the filament inside a light bulb. Give two properties
from the list above which make it a good material to use.
(2)
1 ...............................................................................................................................
2 ...............................................................................................................................
4
The table below shows some of the properties of three different substances – A,
B and C. Complete the last column on the table by stating whether the substance
is a metal, a non-metal or a compound:
(3)
Substance
5
Melting
point °C
Electrical
conductivity
Solubility
in water
Effect of
heating in air
A
113
Very poor
Insoluble
Burns to form
one product –
an acidic gas
B
962
Very good
Insoluble
Loses its shiny
surface
C
-182
Very poor
Almost
insoluble
Burns to form
two new
substances
Metal, non-metal
or compound
Rule a line to link the elements to show whether they are metals or non-metals
and another line to show one of their properties:
(5)
Element
Carbon
Mercury
Nickel
Sulphur
Copper
•
•
•
•
•
•
•
•
•
•
Metal or non-metal
Metal
•
Metal
•
Non-metal •
Metal
•
Non-metal •
•
•
•
•
•
Property
Magnetic
Very good conductor of heat
Brittle
Shiny liquid
Conductor of electricity
Total marks = 35
Pearson Publishing, Chesterton Mill, French’s Road, Cambridge CB4 3NP
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