a) Hydrocarbon
b) i) Fractional distilation
ii) Used as a fuel
johnmulu answered the question on February 21, 2017 at 11:39
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Date posted: February 21, 2017. Answers (1)
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Date posted: February 21, 2017. Answers (1)
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State the observation that would be made when a piece of sodium metal is placed in samples of:
i) Pentane
ii) Pentanol
Date posted: February 21, 2017. Answers (1)
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a) Name one natural fibre
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Date posted: February 21, 2017. Answers (1)
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b) Give a reason why sodium is extracted using electrolysis
c) Give two reasons of sodium metal (Solved)
a) Name the raw material from which sodium is extracted.
b) Give a reason why sodium is extracted using electrolysis
c) Give two reasons of sodium metal
Date posted: February 21, 2017. Answers (1)
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Describe how iron in the ore is removed during extraction of copper metal.(Solved)
One of the ores of copper has the formula, CuFeS2.
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b) State two environmental problems associated with extraction of copper metal
Date posted: February 21, 2017. Answers (1)
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Aluminium is both malleable and ductile
a) What is meant by?
i) Malleable
ii) Ductible
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i) Malleability
ii) Ductility
Date posted: February 21, 2017. Answers (1)
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b) Other than cost, give two reasons why aluminium is used for making electric cables while magnesium is not. (Solved)
a) Explain why the metals magnesium and aluminium are good conductors of electricity
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Date posted: February 21, 2017. Answers (1)
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In the industrial extraction of lead metal, the ore is first roasted in a furnace. The solid mixture obtained is then fed into another furnace together with coke, limestone and scrap iron. State the function of each of the following in this process:
a) Coke
b) Limestone
c) Scrap iron.
Date posted: February 21, 2017. Answers (1)
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The basic raw material for extraction of aluminium is bauxite.
a) Name the method that is used to extract aluminium from bauxite
b) Write the chemical formula of the major component of bauxite
c) i) Name two major impurities in bauxite
ii) Explain how the impurities in bauxite are removed
d) cryolite is used in extraction of aluminium from bauxite. State its function
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Date posted: February 21, 2017. Answers (1)
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Date posted: February 21, 2017. Answers (1)
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Iron is extracted from its ore by the blast furnace process
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Date posted: February 21, 2017. Answers (1)
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When the oxide of element H was heated with element H was heated with powdered carbon the mixture glowed and carbon (IV) oxide was formed. When the experiment was repeated using the oxide of element J, there was no apparent reaction.
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b) Arrange the elements H, J and carbon in the order of their decreasing reactivity.
Date posted: February 21, 2017. Answers (1)
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Date posted: February 21, 2017. Answers (1)
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Date posted: February 21, 2017. Answers (1)
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and state the advantage of using duralumin in place of aluminium for manufacture of aeroplane n parts
(Solved)
a) Explain why it is not advisable to use wood ash for cleaning aluminium utensils
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Date posted: February 21, 2017. Answers (1)
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Date posted: February 21, 2017. Answers (1)