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प्रश्न
Define physical change. Give two examples for the above changes.
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उत्तर
Physical change: A temporary change in which no new substance is formed, the composition of substance remains the same, though its state, shape and size may change.
Example of physical change:
- Change of water into its vapours.
- Heating of iron rod.
संबंधित प्रश्न
Classify the following as chemical or physical change:
Burning of paper and wood
Choose the most appropriate answer.
Rising and setting of the sun at a given place is a
Tick the most appropriate answer.
3. Physical changes are
- permanent.
- periodic,
- temporary
- irreversible.
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
How do you say that the process of digestion is a chemical change ?
State three differences between evaporation and boiling
State whether the following is physical or chemical changes.
photosynthesis —
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
Fill in the blank
Changes that occur in nature are called ______
Classify the following as a physical or a chemical change.
Butter getting rancid
Classify the following as a physical or a chemical change.
Burning of paper
Define a chemical change. Give two examples of the above changes.
Given reason:
Freezing of water to ice and evaporation of water are physical changes.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Give a reason why
Change of seasons is a periodic change while the change of weather is a non-periodic change.
Is a change of state of matter – a physical or a chemical change. Give reasons.
Select the correct answer from the choice given below to complete the sentence
The matter is added or removed during a ____________ change.
State whether the following statement is true or false:
Anaerobic bacteria digest animal waste and produce biogas.
