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Al3+
- A white precipitate would be formed which is insoluble in excess ammonia solution.
Zn2+
- A white precipitate would be formed which is insoluble in excess ammonia solution
john3 answered the question on November 4, 2017 at 23:27
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Flower extracts are often used as indicators in the laboratory. State one disadvantage of using flower extracts as indicators
Date posted: November 4, 2017. Answers (1)
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Date posted: November 4, 2017. Answers (1)
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Date posted: November 4, 2017. Answers (1)
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Date posted: November 4, 2017. Answers (1)
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Date posted: November 4, 2017. Answers (1)
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(a) During the extraction of Aluminium, the oxide of metal is dissolved in Molten cryolite before it is electrolysed. Explain.
(1mk)
(b) Giving reasons, state two uses of Aluminium metal
Date posted: November 4, 2017. Answers (1)
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Date posted: November 4, 2017. Answers (1)
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State and explain the observations made when concentrated nitric (V) acid is added to copper turnings
Date posted: November 4, 2017. Answers (1)
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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)
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Date posted: November 4, 2017. Answers (1)
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What would be observed if blue litmus paper is dipped in chlorine water? Explain
Date posted: November 4, 2017. Answers (1)
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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)
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Date posted: November 4, 2017. Answers (1)
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One of the alloys of copper is brass. State its two uses.
Date posted: November 4, 2017. Answers (1)
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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)
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Give the agencies of the cation and onion in each of the following compounds.
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2)magnesium carbonate
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Date posted: November 4, 2017. Answers (1)
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Date posted: November 3, 2017. Answers (1)