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  1. there are topics in chemistry which do not open
    1: Purification of substances
    2: Metals
    3: Organic Chemistry
    please make them available ASAP.

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  2. A cube of wood has a volume of 0.2cm3 and density of 600kg/m3. It is then placed in a liquid of 800kg/m3 density.
    What fraction of the volume of the wood would be inmersed in the liquid?

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  3. An alloy of copper and tin has volume of 100ml. The density of copper is 8.90g/ml and of tin is 7.30g/ml while of alloy is 7.62g/ml. What is the volume of each metal?

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