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प्रश्न
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
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उत्तर
Wax [CxHy]
APPEARS IN
संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
mixing oil with water —
Tick the most appropriate answer.
Physical changes are
State the various conditions that favour the process of evaporation.
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.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
State whether the following statement is true or false:
Stretching of rubber bands is not a physical change.
