Name two solid, two liquids and two gaseous elements at the room temperature.
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Two solid elements at room temp.– Iron and copper.
Two liquid elements at room temp.– Mercury and bromine.
Two gaseous elements at room temp.– Hydrogen and oxygen.
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Classify the following into metals, non-metals and metalloids: Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium.
Which of the following are physical changes and which are chemical changes? Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
Classify the following materials as homogeneous mixtures and heterogeneous mixtures: Soda-water, Wood, Air, Soil, Vinegar, Alcohol and water mixture, Petrol and water mixture, Chalk and water mixture, Sugar and water mixture, Copper sulphate solution.