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Physical Properties of Non-Metals

Read First- Physical Properties of Metals Non-metals Physical state – Non-metals exists in all three physical state. Carbon, sulphur, phos-phorous etc. are solids. Oxygen, nitrogen, chlorine etc. are gases whereas bromine is a liquid.  Lustre – Non- metals are non-lustrous substances.            Exception – Diamond, graphite (allotropes of carbon) and iodine are lustrous in appearance. Hardness …

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A CHEMICAL REACTION IS CHARACTERIZED BY FORMATION OF A PRECIPITATE.

When a chemical reaction occurs, following observations help us to determine whether a chemical reaction has taken place. (1) Formation of a precipitate (2) Change in colour (3) Evolution of a gas (4) Change in state (5) Change in temperature or evolution / absorption of heat (6) Sound, light may be produced. (7) Change in …

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