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Study the set-up below and answer the questions that follow.
(Solved)
Study the set-up below and answer the questions that follow.

a) (i) Name Gas X
(ii) State the effect of releasing gas X to the environment
b) Write down equations for the reactions taking place in;
(i) Tube I
(ii) Tube II
(iii) Flask
c) State the observation made in tube III
d) Write down an equation for the reaction which could be used to generate Carbon (IV) Oxide for the above set up
(e) Name the reagents used to generate gas X in the laboratory
(f) Complete the diagram above to show how excess gas X can be collected
Date posted:
October 1, 2019
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Answers (1)
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The grid below shows a part of the periodic table. The letters do not represent the actual symbols. Use it to answer the questions that...
(Solved)
The grid below shows a part of the periodic table. The letters do not represent the actual symbols. Use it to answer the questions that follow:-

a) How do the atomic radius of element
(i) X and M compare. Explain.
(ii) U and Q. Explain
b) Which letter represent the most reactive metal. Explain.
Date posted:
October 1, 2019
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Answers (1)
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The number of protons, neutrons and electrons in atoms A to F are given in the table below the letters do not represent the actual...
(Solved)
The number of protons, neutrons and electrons in atoms A to F are given in the table below the letters do not represent the actual symbol of the elements:-

Choose from the table the letters that represent:
(i) An atom of a metal
(ii) A neutral atom of a non-metal
(iii) An atom of a noble gas
(iv) A pair of isotopes
(v) A cation
(vi) Anion
Date posted:
October 1, 2019
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Answers (1)
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When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction
(Solved)
When zinc is heated to redness in a current of steam, hydrogen gas is obtained. Write an equation for the reaction
Date posted:
October 1, 2019
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Answers (1)
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Hydrogen burns in oxygen to form an oxide.
(i) Write an equation for the reaction
(ii) State two precautions that must be taken before the combustion begins...
(Solved)
Hydrogen burns in oxygen to form an oxide.
(i) Write an equation for the reaction
(ii) State two precautions that must be taken before the combustion begins and at the end of
the combustion.
Date posted:
October 1, 2019
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Answers (1)
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Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid.
a) Write an equation for the reaction.
b) Name an appropriate drying agent for hydrogen gas.
c)...
(Solved)
Hydrogen can be prepared by reacting zinc with dilute hydrochloric acid.
a) Write an equation for the reaction.
b) Name an appropriate drying agent for hydrogen gas.
c) Explain why copper metal cannot be used to prepare hydrogen gas.
Date posted:
October 1, 2019
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Answers (1)
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Using dots(•) and crosses(x), show bonding in magnesium chloride.
(Solved)
Using dots(•) and crosses(x), show bonding in magnesium chloride.
Date posted:
September 27, 2019
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Answers (1)
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Study the flow chart below and answer the questions that follow.
(Solved)
Study the flow chart below and answer the questions that follow.

i) Name Compound T
ii) Gas U
iii) The equation below shows the reaction between sulphur (IV) oxide gas and oxygen gas to produce sulphur (VI) oxide in contact process.
2 SO2(g) + O2(g)----->2SO3 D = -197 kJ/mol
State two conditions that are necessary for maximum production of SO3.
iv) Name the catalyst used for this reaction.
Date posted:
September 26, 2019
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Answers (1)
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Study the reaction scheme below and use it to answer the questions that follow.
(Solved)
Study the reaction scheme below and use it to answer the questions that follow.

i) Name the process in;
Step I
Step II
ii) State the reagent necessary for the process in
Step II
Step III
iii) Name the type of reaction taking place in step III
Date posted:
September 26, 2019
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Answers (1)
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Castor oil extracted from castor seeds is found to change the colour of acidified potassium manganate (VII) .
i) State the colour change.
ii) Explain why castor...
(Solved)
Castor oil extracted from castor seeds is found to change the colour of acidified potassium manganate (VII) .
i) State the colour change.
ii) Explain why castor oil reacts with acidified Potassium manganate (VII) to cause the colour change.
Date posted:
September 26, 2019
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Answers (1)
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Below is a list of major components of crude oil and their boiling points.
(Solved)
Below is a list of major components of crude oil and their boiling points.

i) What is the name of the process by which the constituents of crude oil can be separated?
ii) Give one use of the gases component.
iii) Give the order by which the components are obtained from the mixture, starting with the first.
Date posted:
September 25, 2019
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Answers (1)
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A student wrongly categorised air as a compound and not as a mixture. Give two reasons as to why the student was wrong.
(Solved)
A student wrongly categorised air as a compound and not as a mixture. Give two reasons as to why the student was wrong.
Date posted:
September 25, 2019
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Answers (1)
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Draw the following structure.
2-bromo-4-methylpent-2-ene
(Solved)
Draw the following structure.
2-bromo-4-methylpent-2-ene
Date posted:
September 25, 2019
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Answers (1)
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The chromatogram below shows the constituents of a flower extract. Study it and answer the question that follows.
(Solved)
The chromatogram below shows the constituents of a flower extract. Study it and answer the question that follows.

Give a reason to explain the different positions of red and yellow pigments.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below was used to prepare and collect Sulphur (IV) oxide gas.
(Solved)
The diagram below was used to prepare and collect Sulphur (IV) oxide gas.

a) Identify solid M.
b) State two properties of SO2 that makes possible to be collected in the method shown.
c) What are the optimum conditions of conversion of SO2 to SO3.
Date posted:
September 25, 2019
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Answers (1)
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The table below shows the electrical conductivity of substances A, B and C.
(Solved)
The table below shows the electrical conductivity of substances A, B and C.

a) Give the type of structure and bonding that is present in substance A.
b) Which substance is likely to be sodium chloride. Explain.
c) Which one of the substance is likely to be plastic?
i) Explain why the substance you have given in (c) above behaves in the way it does
d) Give the type of structure and bonding that is present in substance A
Date posted:
September 25, 2019
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Answers (1)
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A student used the set-up shown in the diagram below in order to study the reactions of some metals with steam. The experiment was carried...
(Solved)
A student used the set-up shown in the diagram below in order to study the reactions of some metals with steam. The experiment was carried out for ten minutes.

a) What observation would be made if gas H was ignited.
b) When the experiment was repeated using lead powder instead of Beryllium very little of gas H was obtained. Give a reason for this observation.
c) Name another gas which is used together with hydrogen in welding.
Date posted:
September 25, 2019
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Answers (1)
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Draw an Isomer of Pentene.
(Solved)
Draw an Isomer of Pentene.
Date posted:
September 25, 2019
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Answers (1)
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Determine the volume of 2.0M NaOH which when diluted to 250cm3 would produce a 0.8M NaOH solution.
(Solved)
Determine the volume of 2.0M NaOH which when diluted to 250cm3 would produce a 0.8M NaOH solution.
Date posted:
September 25, 2019
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Answers (1)
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The diagram below represents the structure of aluminium chloride.
(Solved)
The diagram below represents the structure of aluminium chloride.

(i) Identify the bonds labelled M and N
(ii) What is the difference between bonds M and N?
Date posted:
September 25, 2019
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Answers (1)