metals and non metals full notes class 7. only objectives.
consise book chemistry.
Answers
Answer:
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Points to Remember :
Knowledge of chemistry plays a vital role in the development of human society and civilization.
Metals are known to man from ancient times. Metals are used to make our life comfortable.
Non-metals form another class of elements, e.g. hydrogen, oxygen, carbon, etc. They are used for various purposes.
Alloys are homogeneous solid mixtures containing two or more metals e.g. steel, brass, bronze.
Common salt, hydrocloric acid, carbohydrates, fats, proteins, vitamins, occur naturally and can also be prepared artificially.
Fertilizers are artificially prepared substances, which are necessary for the proper growth of crops.
There are a number of man-made materials that are used in our daily life for various purposes, e.g., cement, plaster of pairs, plastics.
Medicines are used to cure diseases.
Solution is a homogenous mixture of solute and solvent.
Soda water is prepared by dissolving carbon dioxide in water under high pressure.
Syrup is a highly concentrated sugar solutions. It contains a specific flaviour
Explanation:
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