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The diagram below is a cross section of a dry cell. Study it and answer the questions that follow.
(Solved)
The diagram below is a cross section of a dry cell. Study it and answer the questions that follow.
(i) Write the equation for the reaction in which electrons are produced.
(ii) The Zinc can is lined with Ammonium Chloride and Zinc Chloride paste. What would happen if the mixture was to become dry? Give reason.
Date posted:
March 26, 2019
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Answers (1)
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What factors should be considered when siting a plant to manufacture sulphuric acid?
(Solved)
What factors should be considered when siting a plant to manufacture sulphuric acid?
Date posted:
March 25, 2019
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Answers (1)
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What mass of Lead (II) nitrate could contain 13g of Lead?
(Solved)
What mass of Lead (II) nitrate could contain 13g of Lead?
Date posted:
March 25, 2019
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Answers (1)
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How many calcium ions and chloride ions are in 1 mole of calcium chloride, CaCl2?.
(Solved)
How many calcium ions and chloride ions are in 1 mole of calcium chloride, CaCl2?.
Date posted:
March 25, 2019
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Answers (1)
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Rates of diffusion of two gases A and B are in the ratio 2:1. If the molecular mass of gas A is 16g. Find the...
(Solved)
Rates of diffusion of two gases A and B are in the ratio 2:1. If the molecular mass of gas A is 16g. Find the molecular mass of B.
Date posted:
March 25, 2019
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Answers (1)
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Two gases, A and B have densities of 0.18gdm-3 and 2.90gdm-3 respectively. If they diffuse under the same conditions, what are their relative rates of...
(Solved)
Two gases, A and B have densities of 0.18gdm-3 and 2.90gdm-3 respectively. If they diffuse under the same conditions, what are their relative rates of diffusion.
Date posted:
March 25, 2019
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Answers (1)
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Why is it better to use indicators rather than the sense of taste when testing for acids and alkalis?
(Solved)
Why is it better to use indicators rather than the sense of taste when testing for acids and alkalis?
Date posted:
March 25, 2019
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Answers (1)
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Explain briefly the following observations about a sample of hard water (a) when boiled it formed some white precipitate (b) even after boiling the water...
(Solved)
Explain briefly the following observations about a sample of hard water (a) when boiled it formed some white precipitate (b) even after boiling the water formed scum with soap (c) Sodium Carbonate made the water completely soft.
Date posted:
March 25, 2019
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Answers (1)
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Name the materials used to prepare soaps and soapless detergents.
(Solved)
Name the materials used to prepare soaps and soapless detergents.
Date posted:
March 25, 2019
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Answers (1)
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In an experiment, dry hydrogen chloride gas was passed through heated Zinc turnings as shown in the diagram below. The gas produced was then passed...
(Solved)
In an experiment, dry hydrogen chloride gas was passed through heated Zinc turnings as shown in the diagram below. The gas produced was then passed through heated Lead II Oxide.
(i) What is the function of the water in the flask?
(ii) Write equations for the reactions that took place in the tubes.
(iii) How would the total mass of tube V and its contents compare before and after the experiment? Explain.
Date posted:
March 25, 2019
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Answers (1)
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Paper chromatography of a plant extract gave the following results.
Which Solvent is the most suitable for purifying the extract? Explain.
(Solved)
Paper chromatography of a plant extract gave the following results.
Which Solvent is the most suitable for purifying the extract? Explain.
Date posted:
March 25, 2019
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Answers (1)
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Carbon dioxide doesn’t support combustion, yet burning of magnesium ribbon introduced in jar of carbon dioxide continues to burn. Explain this.
(Solved)
Carbon dioxide doesn’t support combustion, yet burning of magnesium ribbon introduced in jar of carbon dioxide continues to burn. Explain this.
Date posted:
March 25, 2019
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Answers (1)
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Describe an experiment to investigate the “active part of air”.
(Solved)
Describe an experiment to investigate the “active part of air”.
Date posted:
March 25, 2019
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Answers (1)
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Briefly explain how ice-cream vendors use solid carbon dioxide (dry ice) to keep the ice-cream frozen.
(Solved)
Briefly explain how ice-cream vendors use solid carbon dioxide (dry ice) to keep the ice-cream frozen.
Date posted:
March 25, 2019
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Answers (1)
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The following are some of the methods used to collect gases. With reasons state which method is suitable for each of the following gases, Ammonia,...
(Solved)
The following are some of the methods used to collect gases. With reasons state which method is suitable for each of the following gases, Ammonia, carbon dioxide, oxygen.
Date posted:
March 25, 2019
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Answers (1)
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Where in Kenya is Crystallization method used? State what happens briefly.
(Solved)
Where in Kenya is Crystallization method used? State what happens briefly.
Date posted:
March 25, 2019
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Answers (1)
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When fine chalk is suspended in water and viewed through a microscope the chalk particles appear to move in a random fashion. This motion is...
(Solved)
When fine chalk is suspended in water and viewed through a microscope the chalk particles appear to move in a random fashion. This motion is a result of?
Date posted:
March 25, 2019
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Answers (1)
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Against each mixture write down suitable methods of separation.
(a) Coloured extracts of grass dissolved in ethanol.
(b) Kerosine from Crude oil.
(c) Paraffin from water.
(d)...
(Solved)
Against each mixture write down suitable methods of separation.
(a) Coloured extracts of grass dissolved in ethanol.
(b) Kerosine from Crude oil.
(c) Paraffin from water.
(d) Iron filings from Sulphur powder.
(e) Ammonium chloride from Sodium chloride.
(f) Seawater, to obtain salt.
(g) Blue Copper Sulphate crystals from aqueous copper sulphate.
Date posted:
March 25, 2019
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Answers (1)
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Why is fractional distillation suitable for separating crude oil constituents?
(Solved)
Why is fractional distillation suitable for separating crude oil constituents?
Date posted:
March 25, 2019
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Answers (1)
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Which observation made when helium is ignited in oxygen?
(Solved)
Which observation made when helium is ignited in oxygen?
Date posted:
March 24, 2019
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Answers (1)