Give two reasons for supposing that water is a compound and not a mixture.
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Water is a compound because:
Water cannot be separated into its constituents, hydrogen and oxygen by physical methods.
Heat and light are given out when water is prepared by burning hydrogen in oxygen.
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A solution of alcohol in water has been prepared by mixing $150\ mL$ of alcohol with $600\ mL$ of water. Calculate the volume percentage of the solution.
Classify the following into metals, non-metals and metalloids: Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.