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Question
What type of change is colouring of a paper?
One Word/Term Answer
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Solution
Physical change.
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Chapter 3: Changes Around Us - Evaluation [Page 54]
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RELATED QUESTIONS
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
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.
A new substance is formed in a ............... change.
Write true or false for the statement
Decomposition of leaves is a fast change.
State three differences between evaporation and boiling
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
Given reason:
Burning of paper is a chemical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Gas exists in three states as solid, liquid, and gas.
