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प्रश्न
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
उत्तर
- Cooking of food – Chemical change
- Boiling of water – Physical change
- Cutting of trees – Physical change
- Dissolving salt in water – Physical change
- Digestion of food – Chemical change
- Melting of ice- Physical change
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संबंधित प्रश्न
State whether the following is physical or chemical changes.
growing of a piglet into a pig —
Tick the most appropriate answer.
Physical changes are
What is a chemical change ? Give two examples of chemical changes.
Fill in the blank.
A change, which alters the composition of a substances, is known as a___________ change.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Photosynthesis is a natural process by which green plants manufacture food in the presence of sunlight.
State the conclusions which can be drawn, to represent photosynthesis as a physical or a chemical change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Tearing of sheet of paper into pieces is ______ By the process of Heating of water, change.
