- Manufacture of ethanol
- Manufacture of polythene
- Ripening of fruits
- Laboratory preparation of ethane -1,2-diol used as coolant
- Manufacture of detergents
sharon kalunda answered the question on May 22, 2019 at 05:18
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A volume of 80cm3 of a mixture of propane (C3H8) and oxygen were ignited in an experiment.The products were cooled and passed through an aqueous...
(Solved)
A volume of 80cm3 of a mixture of propane (C3H8) and oxygen were ignited in an experiment.The products were cooled and passed through an aqueous sodium hydroxide. The final volume
was reduced by 30cm3
a) Write the equation for the combustion of propane
b) Determine the volume of;
i) The component of the original mixture
ii) Residual oxygen
Date posted:
May 21, 2019
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Answers (1)
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Differentiate between empirical and molecular formula
(Solved)
Differentiate between empirical and molecular formula
Date posted:
May 21, 2019
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Answers (1)
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Draw the structural formula of ethanoic acid
(Solved)
Draw the structural formula of ethanoic acid
Date posted:
May 21, 2019
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Answers (1)
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Give a reasons why ethanoic acid has a higher boiling point than ethanol which has the same
number of Carbon atoms
(Solved)
Give a reasons why ethanoic acid has a higher boiling point than ethanol which has the same
number of Carbon atoms
Date posted:
May 21, 2019
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Answers (1)
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Define oxidation and reduction in terms of electrons.
(Solved)
Define oxidation and reduction in terms of electrons.
Date posted:
May 21, 2019
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Answers (1)
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75g of a saturated solution contains 30g of salt calculate
a) The solubility of the salt
b) The percentage of the salt in the saturated solution
(Solved)
75g of a saturated solution contains 30g of salt calculate
a) The solubility of the salt
b) The percentage of the salt in the saturated solution
Date posted:
May 21, 2019
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Answers (1)
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Three brands of inks M, N and O were suspected to be contaminated with substance P.
The result is shown below;
i) Which ink was contaminated with...
(Solved)
Three brands of inks M, N and O were suspected to be contaminated with substance P.
The result is shown below;

i) Which ink was contaminated with substance P
ii) Name the ink which was pure
iii) Identify the other ink which was not pure
Date posted:
May 21, 2019
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Answers (1)
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Name three sub – atomic particles found in an atom and state where they are found
(Solved)
Name three sub – atomic particles found in an atom and state where they are found
Date posted:
May 21, 2019
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Answers (1)
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A fixed mass of an ideal gas occupies 200cm3 at a pressure of 740 mmHg.Calculate the volume of the gas at 77-mmHg pressure.
(Solved)
A fixed mass of an ideal gas occupies 200cm3 at a pressure of 740 mmHg.Calculate the volume of the gas at 77-mmHg pressure.
Date posted:
May 21, 2019
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Answers (1)
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Sulphur is soluble in ethanol but not in water while common salt is soluble in water but not in
ethanol
a) Explain why sulphur is soluble in...
(Solved)
Sulphur is soluble in ethanol but not in water while common salt is soluble in water but not in
ethanol
a) Explain why sulphur is soluble in ethanol but hot in water.
b) Explain how a pure sample of sodium chloride can be obtained from a mixture of the two.
Date posted:
May 21, 2019
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Answers (1)
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Explain why potassium is kept under paraffin while phosphorous is kept under water
(Solved)
Explain why potassium is kept under paraffin while phosphorous is kept under water
Date posted:
May 21, 2019
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Answers (1)
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The table below shows the ammeter reading obtained when two different electrolytes of the same concentration were tested.
(Solved)
The table below shows the ammeter reading obtained when two different electrolytes of the same concentration were tested.

Why does ethanoic acid give a lower reading?
Date posted:
May 21, 2019
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Answers (1)
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Study the information in the table below and answer the questions that follow (The letters do not represent the actual symbols of the elements).
(i) What...
(Solved)
Study the information in the table below and answer the questions that follow (The letters do not represent the actual symbols of the elements).

(i) What chemical family do the elements A, B and C belong?
(ii) What is meant by the term ionization energy?
(iii) The 2nd ionization energy is higher that the 1st ionization energy of each. Explain
(Iv) When a piece of element C is placed in cold water, it sinks to the bottom and an
effervescence of a colourless gas that bums explosively is produced. Use a simple diagram to illustrate how this gas can be collected during this experiment.
Date posted:
May 21, 2019
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Answers (1)
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What is the difference between thermosoftening and thermosetting plastics?
(Solved)
What is the difference between thermosoftening and thermosetting plastics?
Date posted:
May 21, 2019
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Answers (1)
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Draw a dot (.) and cross (x) diagram to show bonding in:-
(i) Ammonium ion (NH4)
(ii) Silane (SiH4)
(N=14...
(Solved)
Draw a dot (.) and cross (x) diagram to show bonding in:-
(i) Ammonium ion (NH4)
(ii) Silane (SiH4)
(N=14 H=1 Si=14)
Date posted:
May 21, 2019
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Answers (1)
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A volume of nitrogen gas diffuses through a porous pot in 70 seconds. How long would it take
400cm3 of carbon (iv) oxide to diffuse through...
(Solved)
A volume of nitrogen gas diffuses through a porous pot in 70 seconds. How long would it take
400cm3 of carbon (iv) oxide to diffuse through the same porous pot? (C=12 O=16 N=14)
Date posted:
May 21, 2019
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Answers (1)
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When a few drops of aqueous ammonia were added to copper (ii) chloride solution, a light blue
precipitate was formed. On addition of excess ammonia solution,...
(Solved)
When a few drops of aqueous ammonia were added to copper (ii) chloride solution, a light blue
precipitate was formed. On addition of excess ammonia solution, a deep blue solution was formed.
(a) Identify the substance responsible for the:-
(i) light blue precipitate.
(ii) deep blue solution.
(b) Write an equation for the reaction leading to observation in (a) (ii) above.
Date posted:
May 21, 2019
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Answers (1)
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Pieces of blue and red litmus papers were placed into a beaker containing water into which
Aluminium Chloride had been dissolved.State the observations made on the...
(Solved)
Pieces of blue and red litmus papers were placed into a beaker containing water into which
Aluminium Chloride had been dissolved.State the observations made on the papers. Explain your answer.
Date posted:
May 21, 2019
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Answers (1)
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Is dissolving of aluminium chloride in water a physical or chemical process? Explain
(Solved)
Is dissolving of aluminium chloride in water a physical or chemical process? Explain
Date posted:
May 21, 2019
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Answers (1)
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Explain why graphite conducts electricity while diamond does not.
(Solved)
Explain why graphite conducts electricity while diamond does not.
Date posted:
May 21, 2019
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Answers (1)