When gases react, they do so in simple ratios of volumes and those of their products if gaseous
john3 answered the question on November 8, 2017 at 16:46
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When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melt into a golden yellow mobile liquid at 113^oC
(Solved)
When sulphur is heated in a boiling tube in the absence of air, the yellow crystals melt into a golden yellow mobile liquid at 113oC. The liquid turns into a dark brown viscous mass at 180oC. At 400oC the brown liquid becomes less viscous and flows easily. Explain these observations
Date posted:
November 8, 2017
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Answers (1)
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Chlorine gas was bubbled through water and the solution exposed to sunlight for a few hours.
(Solved)
Chlorine gas was bubbled through water and the solution exposed to sunlight for a few hours.State and explain the observations made.
Date posted:
November 8, 2017
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Answers (1)
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When aluminium chloride is dissolved in water, the resulting solution has a PH of 3. Explain.
(Solved)
When aluminium chloride is dissolved in water, the resulting solution has a PH of 3. Explain.
Date posted:
November 8, 2017
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Answers (1)
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Explain why potassium hydroxide is not a suitable reagent for testing carbon (IV) oxide
(Solved)
Explain why potassium hydroxide is not a suitable reagent for testing carbon (IV) oxide
Date posted:
November 8, 2017
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Answers (1)
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When anhydrous Calcium Chloride is exposed to the atmosphere, it forms a solution (a) Name the process that takes place (b) State one use of the process...
(Solved)
When anhydrous Calcium Chloride is exposed to the atmosphere, it forms a solution.
a) Name the process that takes place.
b) State one use of the process named in 2 (a)above.
Date posted:
November 8, 2017
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Answers (1)
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Two carbon electrodes were placed in a flask containing 50cm3of 0.1 M barium hydroxide solution and connected in series with the 12 volt supply of...
(Solved)
Two carbon electrodes were placed in a flask containing 50cm3
of 0.1 M barium hydroxide solution and connected in series
with the 12 volt supply of direct current electricity and a lamp.
1.0M sulphuric acid was slowly run into the solution from a burette until neutralization occurred.
a) What would you see in the flask when the first few drops of acid are added?
b) At the neutrality point, the lamp ceases to glow, explain why?
c) What would you see if more 1.0 M sulphuric acid were now added
Date posted:
November 8, 2017
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Answers (1)
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Water was added to lead (II) nitrate by a student. She divided the resulting solution into four, state the observation made after subjecting them to...
(Solved)
Water was added to lead (II) nitrate by a student. She divided the resulting solution into four, state the observation made after
subjecting them to the following tests:
i) To the first portion she added sodium hydroxide dropwise until in excess. (1 mark)
ii) To the second portion she added ammonia solution dropwise until in excess. (1mark)
iii) the third portion she added hydrochloric acid and warm. (1 mark)
iv) To the last portion she added sodium iodide solution
Date posted:
November 8, 2017
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Answers (1)
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Describe a simple test to confirm presence of Cl
(Solved)
Describe a simple test to confirm presence of Cl
Date posted:
November 8, 2017
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Answers (1)
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Chlorine gas can be prepared in the laboratory by reacting Potassium Manganate (vii) with concentrated hydrochloric acid. (i) Name another suitable reagent that can be...
(Solved)
Chlorine gas can be prepared in the laboratory by reacting Potassium Manganate (vii) with concentrated hydrochloric acid.
(i) Name another suitable reagent that can be used
(ii) State the conditions necessary for (i) above
Date posted:
November 8, 2017
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Answers (1)
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Explain why hydrochloric acid displays acidic properties when dissolved in water, while in methylbenzene, the acid does not display the acidic properties
(Solved)
Explain why hydrochloric acid displays acidic properties when dissolved in water, while in methylbenzene, the acid does not display the acidic properties
Date posted:
November 8, 2017
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Answers (1)
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Which substances are recycled in the solvay process?
(Solved)
Which substances are recycled in the solvay process?
Date posted:
November 7, 2017
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Answers (1)
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Under fractional distillation of liquified air, what is the purpose of sodium hydroxide solution?
(Solved)
Under fractional distillation of liquified air, what is the purpose of sodium hydroxide solution?
Date posted:
November 5, 2017
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Answers (1)
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Explain how a catalyst affects the following in a chemical reaction.(i) The enthalpy change. (ii) The activation energy. (iii) Chemical equilibrium
(Solved)
Explain how a catalyst affects the following in a chemical reaction.
(i) The enthalpy change.
(ii) The activation energy.
(iii) Chemical equilibrium.
Date posted:
November 5, 2017
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Answers (1)
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Give a reason why it is preferred to use warm water to cold water when collecting oxygen gas
(Solved)
Give a reason why it is preferred to use warm water to cold water when collecting oxygen gas
Date posted:
November 5, 2017
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Answers (1)
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State the observation made when hydrogen sulphide gas is bubbled through aqueous lead (II) nitrate solution
(Solved)
1.(a) State the observation made when hydrogen sulphide gas is bubbled through aqueous lead (II) nitrate solution.
(b) Write an ionic equation for the reaction above.
Date posted:
November 5, 2017
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Answers (1)
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Explain why the ability of temporary hard water to conduct electricity falls when water is boiled, but it does not fall when temporary hardness is removed...
(Solved)
Explain why the ability of temporary hard water to conduct electricity falls when water is boiled, but it does not fall when temporary hardness is removed by addition of washing soda
Date posted:
November 5, 2017
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Answers (1)
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The melting point of phosphorous trichloride is -91°C while that of sodium chloride is 801°C. In terms of structure and bonding explain the difference in...
(Solved)
The melting point of phosphorous trichloride is -91°C while that of sodium chloride is 801°C. In terms of structure and bonding explain the difference in the melting point
Date posted:
November 5, 2017
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Answers (1)
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Describe how a solid sample of barium sulphate can be prepared starting with copper (II) oxide
(Solved)
Describe how a solid sample of barium sulphate can be prepared starting with copper (II) oxide
Date posted:
November 5, 2017
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Answers (1)
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Pure nitric (V) acid is colourless but the products in the laboratory preparation is usually yellow. Explain
(Solved)
Pure nitric (V) acid is colourless but the products in the laboratory preparation is usually yellow. Explain
Date posted:
November 5, 2017
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Answers (1)
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Nitric (V) acid may be prepared in the laboratory by the action of concentrated sulphuric (VI) acid on a suitable nitrate and distilling OFF the...
(Solved)
Nitric (V) acid may be prepared in the laboratory by the action of concentrated sulphuric (VI) acid on a suitable nitrate and distilling OFF the nitric (V) acid.
(a) Why is the apparatus consisting of glass desirable
Date posted:
November 5, 2017
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Answers (1)