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The set – up below was used during the electrolysis of a solution of magnesium
sulphate using inert electrodes.
(Solved)
The set – up below was used during the electrolysis of a solution of magnesium
sulphate using inert electrodes.

i). Identify the ions present in the electrolyte
ii). Write half equations at the anode and at the cathode:
Cathode:
Anode
Date posted:
May 16, 2019
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Answers (1)
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Dry chlorine gas was passed through two pieces of coloured cotton cloth as shown.
(Solved)
Dry chlorine gas was passed through two pieces of coloured cotton cloth as shown.

a) State what is observed in each experiment.
Experiment 1
Experiment 2
b) Explain your observation using an equation.
Date posted:
May 16, 2019
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Answers (1)
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During the extraction of copper and Zinc from their Ores, some of the processes include.
(i) Crushing
(ii) Mixing of the crushed Ore with Oil and water...
(Solved)
During the extraction of copper and Zinc from their Ores, some of the processes include.
(i) Crushing
(ii) Mixing of the crushed Ore with Oil and water and bubbling air through it.
(i) Name the process(ii) above.
(ii) What is the purpose of process (ii) above?
Date posted:
May 16, 2019
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Answers (1)
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The boiling and melting points of alkali metals decreases down the group while the melting and boiling points of halogens increase down the group.Explain
(Solved)
The boiling and melting points of alkali metals decreases down the group while the melting and boiling points of halogens increase down the group.Explain
Date posted:
May 16, 2019
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Answers (1)
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Helium is used instead of Hydrogen to fill balloons.Explain
(Solved)
Helium is used instead of Hydrogen to fill balloons.Explain
Date posted:
May 16, 2019
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Answers (1)
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A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.
(Solved)
A solution containing 0.1m sulphuric acid has a pH of 2 while 5M has a pH of more than two.
Explain.
Date posted:
May 16, 2019
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Answers (1)
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State and explain the observation made in the set-up below.
(Solved)
State and explain the observation made in the set-up below.

Date posted:
May 16, 2019
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Answers (1)
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A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.
(Solved)
A mixture of carbon (IV) Oxide and carbon (II) oxide is passed through potassium hydroxide
solution as shown in the following set up.

I) Name gas X
(ii) Why should gas X be burned.
(iii) Write a well balanced chemical equation for the reaction that takes place in the conical
flask in the first few seconds.
Date posted:
May 16, 2019
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Answers (1)
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Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:
(Solved)
Write ionic equations for electrolysis of dilute sulphuric acid using platinum electrodes at:
(i) Anode
(ii) Cathode
Date posted:
May 16, 2019
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Answers (1)
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100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C =...
(Solved)
100cm3 of 2M Nitric acid reacted with 12.5g of a carbonate MCO3 of metal M, calculate the relative atomic mass of M ( C = 12, O = 16)
Date posted:
May 16, 2019
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Answers (1)
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A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow...
(Solved)
A white solid K was heated. It produced a brown gas A and another gas B which relights a
glowing splint. The residue left was yellow even after cooling.
a) Identify gases A and B
b) Write a balanced chemical equation for the decomposition of solid K.
Date posted:
May 16, 2019
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Answers (1)
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Below is a set up used to collect hydrogen gas.
(Solved)
Below is a set up used to collect hydrogen gas.

a) Identify with reasons, two mistakes in the set up.
b) Explain the role of hydrogen in the manufacture of margarine.
Date posted:
May 16, 2019
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Answers (1)
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The scheme below shows some reaction sequence starting with solid M
(Solved)
The scheme below shows some reaction sequence starting with solid M

(i) Name Solid M
(ii) Write the formula of complex ion present in Solution Q
(iii) Write ionic equation of reaction between barium nitrate and solution N.
Date posted:
May 16, 2019
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Answers (1)
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What is the oxidation number of chlorine in ClO-4?
(Solved)
What is the oxidation number of chlorine in ClO-4?
Date posted:
May 16, 2019
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Answers (1)
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In terms of structure and bonding explain why diamond has a high melting point while
graphite has a low melting point.
(Solved)
In terms of structure and bonding explain why diamond has a high melting point while
graphite has a low melting point.
Date posted:
May 16, 2019
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Answers (1)
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Two elements A and B have electronic configurations 2.8.3 and 2.6 respectively.
(Solved)
Two elements A and B have electronic configurations 2.8.3 and 2.6 respectively.
a) To which group and period does element B belong?
b) If the two react, what is the formula of the compound they form
Date posted:
May 16, 2019
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Answers (1)
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Lead (II) ions react with iodide ions according to the equation
(Solved)
(i) Lead (II) ions react with iodide ions according to the equation

300cm3 of 0.1M solution of iodide ions was added to a solution containing Lead (II)
ions. Calculate the mass of Lead (II) iodide formed (Pb= 207, I = 127).
(ii) Identify the colour of the product formed after the reaction above.
Date posted:
May 16, 2019
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Answers (1)
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(i) State and explain what is observed when ammonia solution is gradually added to a solution of Lead (II) nitrate until the alkali (ammonia) is...
(Solved)
(i) State and explain what is observed when ammonia solution is gradually added to a solution of Lead (II) nitrate until the alkali (ammonia) is in excess.
(ii) Write an equation for the reaction that takes place in (i) above
Date posted:
May 16, 2019
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Answers (1)
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When Lead (II) nitrate crystals is heated strongly the crystals crackle and split because
of the gas accumulating inside.
(Solved)
When Lead (II) nitrate crystals is heated strongly the crystals crackle and split because
of the gas accumulating inside.
(i) State three other observations that are made.
(ii) Write an equation for the reaction that takes place when Lead (II) nitrate is
strongly heated.
Date posted:
May 16, 2019
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Answers (1)
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(i) Describe how Lead(II) nitrate is prepared in the Laboratory starting from Lead (II) Oxide.
(ii) Write an equation for the reaction that takes place in...
(Solved)
(i) Describe how Lead(II) nitrate is prepared in the Laboratory starting from Lead (II) Oxide.
(ii) Write an equation for the reaction that takes place in (i) above
Date posted:
May 16, 2019
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Answers (1)