​These are chemistry questions and answers categorized according to topics, papers i.e. Paper 1 and 2, Levels i.e. form 1 to form 4, kcse year the examination was done and section A or B
Select topic/category to open topical questions from that particular option provided. ​Chemistry Topics
a) On the grid provided, plot on the same axis, the graph of volume of gas produced against time (4mks)
In the graph plotted ; Award marks as follows:
b) From the graph, determine the rate of reaction of both acids at 55 secondsi) 1M sulphuric (VI) acid (1mk)
Rate of 1M H2SO4 = 0.5 ± 0.05
ii) 1M ethanoic acid (1mk)
Rate of 1M ethanoic acid = 0.25 ± 0.01
c) The rate of reaction of H2SO4 is twice that of ethanoic acids. This is because H2SO4 is stronger while ethanoic acid is a weak acid.c) Explain the difference in the rate of evolution of the gas as determined in (b) above (2mks)
d) Calculate the number of moles of hydrogen gas produced when 10cm magnesium ribbon is completely reacted with 1M sulphuric (VI) acid. (Molar gas volume = 24dm3 at r.t.p) (2mks)e) What mass of magnesium had therefore reacted? (Mg = 24) (2mks)
a) Name the following;i) Gas L (1mk)
Gas L – Carbon (IV) Oxide
ii) Gas H (1mk)
Gas H – Hydrogen
iii) K (1mk)
K – Propane
b) Name the processes involved in the following stepsi) Step I (1mk)
Step I : Hydrogen
ii) Step II (1mk)
Step II – Neutralization
iii) Step III (1mk)
Step III – Substitution
c) Draw the structure of compound E (1mk)d) Write a chemical equation for the complete combustion of substance F (1mk)e) Name the condition and reagents in step IIIi) Condition (1mk)
U.V light
ii) Reagent (1mk)
Chlorine
f) Calculate the mass of salt Q that would be formed by using 21.9kg of G when it reacts with excess sodium hydroxide (2mks)
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December 2024
AuthorMaurice Atika is a teacher and a netprenuer. |