(a) To lower the Melting point of Aluminium oxide from 20150C to 8000C.
(b) - An alloy of Aluminium is used in making parts of aeroplanes, trucks, trains, buses because they are light, hard and strong.
- For making cooking vessels because they are not easily corroded since they are unreactive.
- Making overhead cables because they are light and good conductors of electricity.
john3 answered the question on November 4, 2017 at 22:59
-
Explain why Hydrogen Sulphide is a gas at room temperature while water is liquid at room temperature
(Solved)
Explain why Hydrogen Sulphide is a gas at room temperature while water is liquid at room temperature
Date posted:
November 4, 2017
.
Answers (1)
-
State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
(Solved)
State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
Date posted:
November 4, 2017
.
Answers (1)
-
Explain how the rate of the reaction between lead and nitric (V) acid would be affected if the temperature of the reaction mixture was lowered.
(Solved)
Explain how the rate of the reaction between lead and nitric (V) acid would be affected if the temperature of the reaction mixture was lowered.
Date posted:
November 4, 2017
.
Answers (1)
-
Name two raw materials required in the manufacture of Sodium carbonate
(Solved)
Name two raw materials required in the manufacture of Sodium carbonate
Date posted:
November 4, 2017
.
Answers (1)
-
What would be observed if blue litmus paper is dipped in chlorine water? Explain
(Solved)
What would be observed if blue litmus paper is dipped in chlorine water? Explain
Date posted:
November 4, 2017
.
Answers (1)
-
Chlorine gas dissolved in distilled water to form chlorine water (a) Name the compounds present in the chlorine water
(Solved)
Chlorine gas dissolved in distilled water to form chlorine water
(a) Name the compounds present in the chlorine water
(b) What would be observed if blue litmus paper is dipped in chlorine water? Explain.
Date posted:
November 4, 2017
.
Answers (1)
-
A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with...
(Solved)
A student was asked to determine the percentage of zinc metal in a mixture of zinc metal and zinc oxide. He reacted the mixture with excess hydrochloric acid and accurately collected the gas evolved, which was then used to calculate the amount of zinc in the mixture.
(a) Name the gas that was evolved
(b) Apart from the reaction liberating the gas write a balanced equation for the other reaction that took place.
(c) Why would dilute nitric acid not suitable for this reaction?
Date posted:
November 4, 2017
.
Answers (1)
-
A sample of water in a beaker was found to boil at 102 at 1 atmospheric pressure. Assuming that the thermometer was not faulty, explain...
(Solved)
A sample of water in a beaker was found to boil at 102 at 1 atmospheric pressure. Assuming that the thermometer was not faulty, explain this observation.
Date posted:
November 4, 2017
.
Answers (1)
-
Explain why the bleaching action of chlorine is permanent while bleaching by sulphur (IV) oxide is temporary
(Solved)
Explain why the bleaching action of chlorine is permanent while bleaching by sulphur (IV) oxide is temporary
Date posted:
November 4, 2017
.
Answers (1)
-
One of the alloys of copper is brass. State its two uses.
(Solved)
One of the alloys of copper is brass. State its two uses.
Date posted:
November 4, 2017
.
Answers (1)
-
During the extraction of copper metal the ore is subjected to froth floatation. Give a reason why this process is necessary
(Solved)
During the extraction of copper metal the ore is subjected to froth floatation. Give a reason why this process is necessary
Date posted:
November 4, 2017
.
Answers (1)
-
Explain this observation:When hydrogen chloride gas is dissolved in water, the solution conducts electricity while a solution of hydrogen chloride gas in methyl benzene does...
(Solved)
Explain this observation:
When hydrogen chloride gas is dissolved in water, the solution conducts electricity while a solution of hydrogen chloride gas in methyl benzene does not conduct electricity.
Date posted:
November 4, 2017
.
Answers (1)
-
Give the agencies of the cation and onion in each of the following compounds. (1)Zinc sulphate (2)Magnesium carbonate (3)Aluminium nitrate
(Solved)
Give the agencies of the cation and onion in each of the following compounds.
1)Zinc sulphate
2)magnesium carbonate
3)Aluminium nitrate
Date posted:
November 4, 2017
.
Answers (1)
-
Identify the catalyst preferred in contact process. Explain
(Solved)
Identify the catalyst preferred in contact process. Explain
Date posted:
November 3, 2017
.
Answers (1)
-
Using acidified potassium dichromate (VI) solution, describe how you would differentiate between sulphur (IV) oxide and hydrogen sulphide
(Solved)
Using acidified potassium dichromate (VI) solution, describe how you would differentiate between sulphur (IV) oxide and hydrogen sulphide
Date posted:
November 3, 2017
.
Answers (1)
-
1.(a) Define electrolysis
(b) During the electrolysis of molten aluminium oxide, write the equations at the;
Anode -
Cathode -
(Solved)
1.(a) Define electrolysis
(b) During the electrolysis of molten aluminium oxide, write the equations at the;
Anode -
Cathode -
Date posted:
November 3, 2017
.
Answers (1)
-
Give any two differences between alpha and beta particles
(Solved)
Give any two differences between alpha and beta particles
Date posted:
November 3, 2017
.
Answers (1)
-
Describe how sodium sulphate crystals can be prepared starting with 50cm3
of 2M sodium hydroxide and 1M sulphuric
(VI) acid
(Solved)
Describe how sodium sulphate crystals can be prepared starting with 50cm3
of 2M sodium hydroxide and 1M sulphuric
(VI) acid
Date posted:
November 3, 2017
.
Answers (1)
-
Explain why Aluminium is better conductor of electricity than magnesium
(Solved)
Explain why Aluminium is better conductor of electricity than magnesium
Date posted:
November 3, 2017
.
Answers (1)
-
Name one piece apparatus used to measure volume of gases
(Solved)
Name one piece apparatus used to measure volume of gases
Date posted:
November 3, 2017
.
Answers (1)