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State observations made when excess hydrogen suphide gas is bubbled into copper (II) sulphate solution.
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A student attempted to prepare hydrogen sulphide gas and collected the gas over cold water. The student collected only a few bubbles of gas. Explain.
Date posted: January 16, 2017 . Answers (1)
Starting with zinc oxide, describe how a pure sample of zinc sulphate can be prepared in the laboratory.
A form three student added sodium carbonate solution to a solution of aluminium chloride in water. A white precipitate was formed. The precipitate soon dissolved liberation a colourless gas.i) What is the white precipitate?ii) Explain why the precipitate dissolves?
Magnesium and silicon are both in period III of the periodic table. The atomic radius of the magnesium is found to be higher than silicon. Explain this observation.
Nitrogen (II) oxide is produced in the internal combustion engines. State and explain how it affects the environment.
Name a pair of suitable reagents that can be used to prepare nitrogen (II) oxide in the laboratory.
State Graham's law.
Name the two flames produced by a Bunsen burner and the conditions under which they are produced.
What factors should be considered when choosing a fuel for cooking?
Date posted: January 14, 2017 . Answers (1)