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The formula given below represents a portion of a polymer Give:
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The diagram below represents a charcoal burner. Study it and answer the questions that follow
Write equations for the reactions taking place at I and I and II
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Describe how a solid sample of lead (II) Chloride can be prepared using the following reagents, dilute nitric acid, dilute hydrochloric acid and lead carbonate.
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Urea, (NH2)2CO is prepared by the reaction between ammonia and carbon dioxide. 2NH3(g) + CO2(g) → (NH2)2CO(aq) + H2O(l). In one process, 680 kg of ammonia were reacted with excess carbon dioxide. Calculate the mass of urea that was formed. (H = 1.0, c+ 12.0, N =14.0, O = 16.0 and relative molecular mass of ammonia = 17) Calculate the mass of Urea that was formed
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Study the information in the table below and answer the questions below the table.
Calculate the enthalpy change of the reaction:
CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g)
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The diagram below represents a paper chromatogram for three brands of juices suspected to contain banned food colorings.
The results showed the presence of banned food colorings in L and M only. On the same diagram:
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The grid below shows part of a periodic table. The letters do not represent the actual symbols of the elements
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Draw the structural formula of:
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The set-up below was used to electrolyze aqueous copper (II) sulphate
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Distinguished between a strong and a weak acid. Give examples.
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Diamond and graphite are allotropes of carbon. In terms of structure and bonding explain the following.
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An ion of phosphorous can be represented as
Draw a diagram to show the distribution of the electrons and the composition of the nucleus of the ion of phosphorous.
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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.
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The equation below represents a redox reaction. Identify the reducing agent. Give a reason.
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December 2024
AuthorMaurice Atika is a teacher and a netprenuer. |
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