which of the following are chemical changes?
(a) growth of a plant
(b)rusting of iron
(c) mixing of iron filling and sand
(d) cooking of food
(e)digestion of food
(f)freezing of food
(g) burning of a candle
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Answer:
If an object is travelling with uniform motion, it is moving in a straight line at a constant speed. For example, when a car travels at a constant speed, the driving force from the engine is balanced by the resistive forces such as air resistance and frictional forces in the car's moving parts.
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Answer:
- Growth of a plant, rusting of iron, cooking of food, digestion of food, and burning the candle are chemical changes because here is the chemical composition of the substance changes.
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