CHEMISTRY APRIL HOLIDAY ASSIGNMENT

LORETO CONVENT MSONGARI
FORM 4A/B/C CHEMISTRY APRIL HOLIDAY ASSIGNMENT
ON METALS
1. The following diagram represents extraction of sodium by the Down’s cell




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(a) Why is the anode made of graphite in this case instead of steel which is a better
conductor of electricity?



(b) How are the electrolytic products separated from reacting?



(c) Give reasons why large quantities of electricity is required for this process


2. Study the flow chart below and answer the questions that follow:

Copper Pyrites
Gas Q Gas Q

Step (I) Froth floatation,

Air
Step (II) Air Cu2S
CuFeS2 Cu2S(s) Cu2O Cu(s)
Step (III) Step (IV)

Step (V)

FeO Pure
Copper




1

, (a) Name gas Q ……………………………………………………………


.
(b) With the help of diagram, describe how step (V) is carried out




3. The flow chart below shows steps used in the extraction of zinc from one of its ores.
Lead (II) Carbonate Crushing Powdered Lead (II) Concentrated Lead (II)
ore Carbonate ore
Carbonate ore

Step I Step 2

Step 3 Heat

Gas

Coke
Lead (II) Metal Lead (II) Oxide

(a) Name the process that is used in step 2 to concentrate the ore




(b) Write an equation for the reaction which takes place in step 3




(c) Name one use of lead


4. Name the chief ores from which the following metals are extracted
a)Aluminium ……………………………………………………………………
b) Copper ………………………………………………………………………




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