Get premium membership and access questions with answers, video lessons as well as revision papers.
To make it harder and stronger and more durable. About 50% addition of Sulphur produces a very hard vulcanite or ebonite.
Kavungya answered the question on March 25, 2019 at 13:11
- Name one substance used for vulcanisation of rubber.(Solved)
Name one substance used for vulcanisation of rubber.
Date posted: March 25, 2019. Answers (1)
- List four ammonium salts and state the uses of each.(Solved)
List four ammonium salts and state the uses of each.
Date posted: March 25, 2019. Answers (1)
- Explain how carbon monoxide is lethal when one inhales.(Solved)
Explain how carbon monoxide is lethal when one inhales.
Date posted: March 25, 2019. Answers (1)
- State six uses of carbon dioxide.(Solved)
State six uses of carbon dioxide.
Date posted: March 25, 2019. Answers (1)
- How many molecules, by avogadro’s number does 0.32g of oxygen gas has?(Solved)
How many molecules, by avogadro’s number does 0.32g of oxygen gas has?
Date posted: March 25, 2019. Answers (1)
- 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. Answers (1)
- 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. Answers (1)
- 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)