Get premium membership and access questions with answers, video lessons as well as revision papers.
- Calculate the number of nitrogen molecules in 560cm3 of nitrogen gas at s.t.p.(Solved)
Calculate the number of nitrogen molecules in 560cm3 of nitrogen gas at s.t.p.
Date posted: March 25, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- The graph below shows the changes in PH as sodium hydroxide was added to a solution of hydrochloric acid.
(a) Explain what happens at B.
(b) What...(Solved)
The graph below shows the changes in PH as sodium hydroxide was added to a solution of hydrochloric acid.
(a) Explain what happens at B.
(b) What would be the colour of:
(i) Methyl orange at A?
(ii) Phenolphthalein at C?
Date posted: March 25, 2019. Answers (1)
- A weak base containing a few drops of methyl orange indicator was titrated with a strong acid and the curve below was obtained.
a)What will be...(Solved)
A weak base containing a few drops of methyl orange indicator was titrated with a strong acid and the curve below was obtained.
a)What will be the colour of the indicator at
(i) A (ii) B
b)Explain why the PH value decreases.
Date posted: March 25, 2019. Answers (1)
- 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. Answers (1)
- What is neutralization?(Solved)
What is neutralization?
Date posted: March 25, 2019. Answers (1)
- State the uses of four alkaline solutions.(Solved)
State the uses of four alkaline solutions.
Date posted: March 25, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- Define the following terms:
i)Acids
ii)Bases
iii)Salts
iv)Indicators(Solved)
Define the following terms:
i)Acids
ii)Bases
iii)Salts
iv)Indicators
Date posted: March 25, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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. Answers (1)