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प्रश्न
Classify the following as physical or chemical change :
Formation of curd from milk
पर्याय
Physical change
Chemical change
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उत्तर
Formation of curd from milk – Chemical change
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संबंधित प्रश्न
Which of the following are chemical changes?
- Growth of a plant
- Rusting of iron
- Mixing of iron fillings and sand
- Cooking of food
- Digestion of food
- Freezing of water
- Burning of candle
Define physical change. Give two examples for the above changes.
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
True or false
Change of seasons is a non-periodic change.
Tick the most appropriate answer.
Rising and setting of the sun at a given place is a
Tick the most appropriate answer.
Physical changes are
Fill in the blank
Heat is ________ by a gas during the process of condensation.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places. Differentiate between the following change with a suitable example.
Desirable and undesirable change.
Name the following.
The salt obtained when a chemical change takes place on the addition of iron to dilute sulphuric acid.
