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C5 Practise Test
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- Chemistry
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- London School Of Economics (LSE)
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Practice testChemistry Module 5
Higher
Time: 20 minutes
Name: _______________________________________________
Form/teaching set: _____________________________________
Answer all of the questions.
Write your answers in the spaces provided on this paper.
You will need a copy of the periodic table for this test.
Twenty First Century Science Chemistry Module 5 Higher © Oxford University Press 2011 Page 1 of 7
, TWENTY FIRST CENTURY SCIENCE DATA SHEET
Qualitative analysis
Tests for ions with a positive charge
ion test observation
a white precipitate forms; the
calcium
add dilute sodium hydroxide precipitate does not dissolve in
Ca2+
excess sodium hydroxide
a light blue precipitate forms;
copper
add dilute sodium hydroxide the precipitate does not dissolve
Cu2+
in excess sodium hydroxide
a green precipitate forms; the
iron(II)
add dilute sodium hydroxide precipitate does not dissolve in
Fe2+
excess sodium hydroxide
a red-brown precipitate forms;
iron(III)
add dilute sodium hydroxide the precipitate does not dissolve
Fe3+
in excess sodium hydroxide
a white precipitate forms; the
zinc
add dilute sodium hydroxide precipitate dissolves in excess
Zn2+
sodium hydroxide
Tests for ions with a negative charge
ion test observation
the solution effervesces; carbon
carbonate dioxide gas is produced (the
add dilute acid
CO 3 2– gas turns lime water from
colourless to milky)
chloride add dilute nitric acid,
a white precipitate forms
Cl – then add silver nitrate
bromide add dilute nitric acid,
a cream precipitate forms
Br– then add silver nitrate
iodide add dilute nitric acid,
a yellow precipitate forms
I– then add silver nitrate
add dilute acid,
sulfate
then add barium chloride or a white precipitate forms
SO 4 2–
barium nitrate
Twenty First Century Science Chemistry Module 5 Higher © Oxford University Press 2011 Page 2 of 7
, 1 Edward needs to identify two green salts, which are labelled A and B.
He does the tests in the table below and records his observations.
Test Test Salt A Salt B
number observations observations
1 Dissolve a little of the salt in light blue green precipitate
water. Add sodium hydroxide precipitate
solution.
2 Add dilute hydrochloric acid fizzing – gas no change
to a sample of the solid salt. produced
3 Dissolve a little of the salt in no change precipitate formed
water. on filtering, could
Add a little dilute hydrochloric see that precipitate
acid then add barium chloride was white
solution.
4 Dissolve a little of the salt in no change no change
water.
Add a little dilute nitric acid
then add silver nitrate
solution.
a Give the formula of the metal ion present in salt A.
………………………………………………………………………………………………
[1]
b Suggest why the mixture produced in test 3 on salt B was filtered.
………………………………………………………………………………………………
………………………………………………………………………………………………
………………………………………………………………………………………………
[1]
Twenty First Century Science Chemistry Module 5 Higher © Oxford University Press 2011 Page 3 of 7
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