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How many grams of Sulphur contain 3.0 x 1021 atoms?.
(Solved)
How many grams of Sulphur contain 3.0 x 1021 atoms?.
Date posted:
March 25, 2019
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Answers (1)
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100cm3 of a gas at r.t.p was cooled to 60cm3. Calculate the new temperature of the gas in 0C if the pressure is kept constant.
(Solved)
100cm3 of a gas at r.t.p was cooled to 60cm3. Calculate the new temperature of the gas in 0C if the pressure is kept constant.
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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In an experiment, it was found that a mole of a gas occupied 24.0dm3 at 200C and atmospheric pressure. What volume would it occupy at...
(Solved)
In an experiment, it was found that a mole of a gas occupied 24.0dm3 at 200C and atmospheric pressure. What volume would it occupy at S.T.P?
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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At 270C, nitrogen has a volume of 650cm3 under pressure of 980mmHg. What would be its volume at the same temperature but at a pressure...
(Solved)
At 270C, nitrogen has a volume of 650cm3 under pressure of 980mmHg. What would be its volume at the same temperature but at a pressure of 760mmHg?.
Date posted:
March 25, 2019
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Answers (1)
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Explain why dilute Sulphuric acid is a stronger acid than the concentrated one.
(Solved)
Explain why dilute Sulphuric acid is a stronger acid than the concentrated one.
Date posted:
March 25, 2019
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Answers (1)
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What do you understand by the term solubility of a solute in a solvent.
(Solved)
What do you understand by the term solubility of a solute in a solvent.
Date posted:
March 25, 2019
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Answers (1)
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List five methods used to prepare salts in the laboratory regardless of whether the salts are soluble or insoluble.
(Solved)
List five methods used to prepare salts in the laboratory regardless of whether the salts are soluble or insoluble.
Date posted:
March 25, 2019
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Answers (1)
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What is neutralization?
(Solved)
What is neutralization?
Date posted:
March 25, 2019
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Answers (1)
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State the uses of four alkaline solutions.
(Solved)
State the uses of four alkaline solutions.
Date posted:
March 25, 2019
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Answers (1)
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State how you can determine the strength of acids and alkalis.
(Solved)
State how you can determine the strength of acids and alkalis.
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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You are given a clear liquid in a beaker. Explain how you would confirm that the liquid is pure water.
(Solved)
You are given a clear liquid in a beaker. Explain how you would confirm that the liquid is pure water.
Date posted:
March 25, 2019
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Answers (1)
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Oxygen and nitrogen are obtained from air by fractional distillation. Why can this method be used for this purpose yet cannot be used to obtained...
(Solved)
Oxygen and nitrogen are obtained from air by fractional distillation. Why can this method be used for this purpose yet cannot be used to obtained hydrogen and oxygen from water?
Date posted:
March 25, 2019
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Answers (1)
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How is hydrogen manufactured on a large scale? Give three industrial uses of the gas.
(Solved)
How is hydrogen manufactured on a large scale? Give three industrial uses of the gas.
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)