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प्रश्न
Make a list of different types of changes with example.
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उत्तर
Different types of changes are as under :
- Reversible Change e.g. Melting of ice.
- Irreversible Change e.g. Burning of paper.
- Periodic Change e.g. Swinging of pendulum.
- Non-Periodic Change e.g. Occurrence of floods.
- Desirable Change e.g. Ripening of fruits.
- Undesirable Change e.g. Rusting of Iron.
- Natural Change e.g. Changing of Seasons
- Man-Made Change e.g. Changing the direction of flow of a river by dams.
- Slow Change e.g. Growth of a plant
- Fast Change e.g. Occurrence of lightning during thunderstorm.
- Physical Change e.g. transformation of ice.
- Chemical Change e.g. curdling of milk.
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Classify the following changes as physical or chemical: curdling of milk
True or false
Dissolving of a solid in liquid is a physical change.
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.
Slow and fast change.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Select the chemical changes from the following list of changes
The carbon cycle.
Select the correct answer from the choice given below to complete the sentence
A change in which a substance retains its identity is a
______ change.
Ice, water and water vapour look different and display different ______ properties but they are ______ the same.
Mention some of the different conditions needed for chemical changes to occur.
