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- The diagrams below represent two allotropes of Sulphur. Study them and answer the questions which follow:-(Solved)
The diagrams below represent two allotropes of Sulphur. Study them and answer the questions which follow:-
(i) Name the two allotropes labelled X and Y
(ii) (I) Explain why a piece of burning magnesium continues to burn in a gas jar of Sulphur (IV) Oxide
(II) Explain how one of the products formed in (I) above can be obtained from the mixture
Date posted: October 24, 2019. Answers (1)
- 6.0 dm3 of sulphur (IV) oxide were oxidized by oxygen to sulphur (VI) oxide.
(i) Write an equation for the reaction.
(ii) Calculate the number of moles...(Solved)
6.0 dm3 of sulphur (IV) oxide were oxidized by oxygen to sulphur (VI) oxide.
(i) Write an equation for the reaction.
(ii) Calculate the number of moles of sulphur (IV) oxide and oxygen used at R.T.P.
(iii) Determine the volume of oxygen used.
(Molar volume of a gas at R.T.P. is 24.0 dm3)
Date posted: October 24, 2019. Answers (1)
- Name the product formed when a mixture of sulphur and Iron is heated.(Solved)
Name the product formed when a mixture of sulphur and Iron is heated.
Date posted: October 24, 2019. Answers (1)
- Give two reasons why during the manufacture of sulphuric (VI) acid, sulphur (VI) Oxide,is dissolved in concentrated Sulphuric (VI ) acid instead of dissolving in...(Solved)
Give two reasons why during the manufacture of sulphuric (VI) acid, sulphur (VI) Oxide,is dissolved in concentrated Sulphuric (VI ) acid instead of dissolving in water.
Date posted: October 24, 2019. Answers (1)
- During Frasch process molten sulphur flows out through the middle pipe but not through the outer pipe. Give a reason(Solved)
During Frasch process molten sulphur flows out through the middle pipe but not through the outer pipe. Give a reason
Date posted: October 24, 2019. Answers (1)
- What would be observed if moist blue litmus paper is dropped into a gas jar of Sulphur (IV) Oxide? Explain your answer with an equation(Solved)
What would be observed if moist blue litmus paper is dropped into a gas jar of Sulphur (IV) Oxide? Explain your answer with an equation
Date posted: October 24, 2019. Answers (1)
- Name one reagent that can be reacted with dilute hydrochloric acid to produce Sulphur (IV) oxide(Solved)
Name one reagent that can be reacted with dilute hydrochloric acid to produce Sulphur (IV) oxide
Date posted: October 24, 2019. Answers (1)
- When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron fillings and sulphur. Explain this observation.(Solved)
When a mixture of iron powder and sulphur is heated it glows more brightly than that of iron fillings and sulphur. Explain this observation.
Date posted: October 24, 2019. Answers (1)
- Write an equation for the reaction between iron (II) sulphide and dilute hydrochloric acid(Solved)
Write an equation for the reaction between iron (II) sulphide and dilute hydrochloric acid
Date posted: October 24, 2019. Answers (1)
- The set-up below is used to prepare dry sulphur (IV) Oxide in the laboratory. Answer questions
that follow:(Solved)
The set-up below is used to prepare dry sulphur (IV) Oxide in the laboratory. Answer questions
that follow:
(a) Identify the mistake in the set-up
(b) Write an equation for the reaction in the set-up
(c) State how the polluting effects of the gas on the environment can be controlled
Date posted: October 24, 2019. Answers (1)
- (i) Is concentrated sulphuric acid a weak acid or a strong acid?(ii) Explain your answer in (i) above.(Solved)
(i) Is concentrated sulphuric acid a weak acid or a strong acid?
(ii) Explain your answer in (i) above.
Date posted: October 24, 2019. Answers (1)
- Commercial sulphuric acid has a density of 1.8gcm3
(a) Calculate the molarity of this acid
(b) Determine the volume of commercial acid in (a) above that can...(Solved)
Commercial sulphuric acid has a density of 1.8gcm3
(a) Calculate the molarity of this acid
(b) Determine the volume of commercial acid in (a) above that can be used to prepare
500cm3 of 0.2M H2SO4 solution
Date posted: October 24, 2019. Answers (1)
- Study the flow chart below and answer the questions that follow(Solved)
Study the flow chart below and answer the questions that follow
(a) State the observation made when ammonia is passed over heated Copper (II) Oxide
(b) Identify:-
(i) Gas A
(ii) Liquid B
Date posted: October 24, 2019. Answers (1)
- When dry ammonia gas is passed over hot copper (II) Oxide, a shinny brown residue and a colourless droplets are formed. Explain these two observations(Solved)
When dry ammonia gas is passed over hot copper (II) Oxide, a shinny brown residue and a colourless droplets are formed. Explain these two observations
Date posted: October 24, 2019. Answers (1)
- State the conditions under which nitrogen react with hydrogen to form ammonia during Haber process(Solved)
State the conditions under which nitrogen react with hydrogen to form ammonia during Haber process
Date posted: October 24, 2019. Answers (1)
- When a few drops of aqueous ammonia were added to a colourless solution X, a white precipitate was formed. On addition of more aqueous ammonia,...(Solved)
When a few drops of aqueous ammonia were added to a colourless solution X, a white precipitate was formed. On addition of more aqueous ammonia, the white precipitate dissolved to a colourless solution Q
(a) Name the white precipitate formed
(b) Write formula of the complex ion present in the colourless solution Q
(c) Write an ionic equation for the formation of the white precipitate
Date posted: October 24, 2019. Answers (1)
- Ammonia turns wet red litmus paper blue. Which ion is responsible for this reaction(Solved)
Ammonia turns wet red litmus paper blue. Which ion is responsible for this reaction
Date posted: October 24, 2019. Answers (1)
- Nitrogen (I) Oxide supports, combustion of burning charcoal. Write an equation to show this reaction(Solved)
Nitrogen (I) Oxide supports, combustion of burning charcoal. Write an equation to show this reaction
Date posted: October 24, 2019. Answers (1)
- When sulphur powder is heated to over 400oC the following changes are observed:-
At 113oC it melts into light brown liquid. The liquid then darkens to...(Solved)
When sulphur powder is heated to over 400oC the following changes are observed:-
At 113oC it melts into light brown liquid. The liquid then darkens to become reddish-brown
and very viscous at 160oC. Above 160oC the liquid becomes almost black. At the boiling point the liquid becomes mobile. Explain these observations
Date posted: October 24, 2019. Answers (1)
- The diagram below was used to investigate the reaction between nitrogen(I)oxide and copper turnings. Study it and answer the questions that follow:(Solved)
The diagram below was used to investigate the reaction between nitrogen(I)oxide and copper turnings. Study it and answer the questions that follow:
a) What has been omitted in the set-up?
b) Write a chemical equation for the reaction that took place in the combustion tube
c) State one use of gas P
Date posted: October 24, 2019. Answers (1)