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Form 4 Chemistry 2017 Question Paper

Form 4 Chemistry 2017 

Course:Chemistry

Institution: Form 4 question papers

Exam Year:2017



1.state two reasons why most apparatus in the laboratory are made of glass (1mk)
2.lead (II) sulphate can be prepared by double decomposition.
(a) What is meant by double decomposition?
(b) Starting with 0.1M sodium sulphate,describe how you would prepare lead (II) sulphate.
3.The mass of 1dm³ of a gas at s.t.p is 1.52g.what is the relative molecular mass of the gass?(1 mole of gass occupies 22.4dm³ at s.t.p.(2mks)
4.A current was passed through molten aluminium oxide for 10 minutes.the volume of oxygen collected at the anode was 112cm³ at s.t.p
Calculate the mass of aluminium obtained at the cathode. (O=16,AL=27,molar gas volume at s.t.t=22.4dm³,F=96500C)(3mks)
5.state and explain the function of tartaric acid in baking powder(2mks)
6.producer gas and water gas are collectively known as fuel gas.producer is a mixture of carbon II oxide and Nitrogen while water gas is a mixture of carbon II oxide and hydrogen.
(a)state one advantage and one disadvantage of using water bass.(2mks
7.State one factor that makes chloro fluoro carbons serious gaseous pollutants.(1mk)
8.Briefly explain why water is not used to put off oil fires.(2mks)
9.Explain why a high temperature is required for nitrogen to react with oxygen.(1mk)
10.Hydrogen sulphide gas was passed through a solution of iron III chloride
(I)state the observations made.(1mk)
(ii)write an ironic equation for the reactions taking place (1mk)




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