When the first electron is removed the remaining electrons are strongly attracted by the nuclear centres
john3 answered the question on November 5, 2017 at 05:59
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Define second ionisation energy
Date posted: November 5, 2017. Answers (1)
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Give one industrial use of chlorine gas
Date posted: November 5, 2017. Answers (1)
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Date posted: November 5, 2017. Answers (1)
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(i) State and explain the observation made(Solved)
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(i) State and explain the observation made
Date posted: November 5, 2017. Answers (1)
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Date posted: November 5, 2017. Answers (1)
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Name one reagent that can be used to distinguish between Al3+ and Zn2+ ions in solution and state what would be observed if each of the ions is treated with the reagent you have named.
Date posted: November 4, 2017. Answers (1)
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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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Zinc is extracted from calamine, name another ore used to extract zinc
Date posted: November 4, 2017. Answers (1)
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State and explain the observation made when coloured flowers are placed into a gas jar full of chlorine gas
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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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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Name two raw materials required in the manufacture of Sodium carbonate
Date posted: November 4, 2017. Answers (1)
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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)
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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)