Q4 of 18 Page 9

Answer the following :

Give two reasons to prove that water is a compound and not an element.

Two reasons to prove that water is a compound and not an element are:


● Water comprises of 2 parts of hydrogen and one part of oxygen and they combine chemically. Thus water is a compound which is made up of two elements and its properties are completely different from its constituents.


2H2 + O2 = 2H2O


● The constituents of the water cannot be separated physically and need chemical methods to separate its constituents.


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Define the terms efflorescence and deliquescence.

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Answer the following :

Name three metals which do not react with water, under normal conditions.

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Answer the following :

Name the products formed when the following oxides are dissolved in water. Write a balanced equation.


a. Sulphur dioxide


b. Potassium oxide


c. Carbon dioxide


d. Calcium oxide