KCSE CHEMISTRY QUESTIONS AND ANSWERS PER TOPIC
Diamond and graphite are allotropes of carbon. In terms of structure and bonding explain the following.
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A sample of water drawn from a river passing through an agricultural district was divided into two portions. The first portion gave a white precipitate when acidified barium chloride was added. The second portion when warmed with aqueous sodium hydroxide gave a colourless gas, which turned a moist red litmus paper blue.
On complete combustion of a sample of hydrocarbon, 3.52 gm of carbon dioxide and 1.44 gm of water were formed. Determine the molecular formula of the hydrocarbon.
(Relative molecular masses of hydrocarbon = 56, carbon dioxide 44, water = 18 and relative atomic masses H = 1.0 and c = 12.0)
Give one advantage and one disadvantage of using petrol containing tetraethyl lead in motor vehicles.
Expected Response
Advantage
Expected response
Add water to the solid mixture A dissolves while B does Not
An isotope of Uranium 234U, decays by emission of an alpha particle to thorium 92
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