September 4, 2022

NCERT Solutions Std 7 Science Physical and Chemical Changes

CBSE Std 7 Science / By

Physical and Chemical Changes Exercise:   1). Classify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f ) Digestion of food Physical Changes Chemical Changes Dissolving sugar in water …

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NCERT Solutions Std 7 Science Acids, Bases and Salts

CBSE Std 7 Science / By

Acids, Bases and Salts Exercise: 1). State differences between acids and bases. Acids Bases 1. Acids are substances that contain hydrogen ion.   1. Bases are substances that contain hydroxyl ion. 2. Acid turns blue litmus red.   2. Base turns red litmus blue. 3. Acids are sour to taste.   3. Bases are bitter …

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