State two reasons for supposing that brass is a mixture and not a compound.
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Brass is a mixture because:
It shows the properties of its constituents, copper and zinc.
It has a variable composition.
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Give an example each for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures: Two volatile components with appreciable difference in boiling points.
Classify the following into elements, compounds and mixtures: Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, chalk.
Differentiate between physical and chemical change. Give one example of each. Give one example where both physical and chemical change is taking place.