P545/2 Chemistry Paper 2: Uganda Certificate of Education Page 1
P545/2 Chemistry Paper 2: Uganda Certificate of Education Page 1
P545/2 Chemistry Paper 2: Uganda Certificate of Education Page 1
CHEMISTRY
PAPER 2
1. Lead (II) carbonate was heated in a boiling tube until there was
no further change.
(b) Write equation for the reaction that took place. (1 ½ marks)
(a) Write equation for the reaction which took place when the salt
was heated. (1 ½ marks)
i. Carbon. (1 ½ marks)
(b) Name one substance, from those listed above with which
concentrated sulphuric acid reacts as a dehydrating agent.
(½ mark)
(c) Write equation for the reaction that takes place in (b).
(1 ½ marks)
(i) (1 ½ marks)
(ii). (1mark)
(c) Excess dilute sulphuric acid was added to the product formed,
followed by dilute sodium hydroxide. Write ionic equations for the
reactions that took place. (3marks)
(e) State one disadvantage associated with the use of hard water.
(1mark)
(c) Name one oxide of nitrogen which forms two acids when
reacted with Water. (½ mark)
(d) Write equation for the reaction that takes place in (c).
(1 ½ marks)
11. (a) Briefly describe the extraction of sugar crystals from sugar
cane. (7 marks)
(ii) State the term that describes this type of reaction. (1mark)
(e) Name two substances that can cause water pollution. (2marks)
13. (a) Name one reagent that can be used to distinguish between
each of the following pairs, and in each case state what would be
observed if the reagent is separately reacted with each member of
the pair. .
Uganda Certificate of Education Page 13
(i) Pb2+(aq) and Mg2+(aq) . (3marks)
14. (a) Distinguish between the terms, normal salt and acid salt,
and give an example in each case to illustrate your answer.
(4marks)
(d) Name two other salts that can be prepared by the same method
as described for lead (II) sulphate. (1mark)