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Question
Which of the following are physical changes and which are chemical changes ?
Rusting of iron
Options
Physical change
Chemical change
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Solution
Rusting of iron – Chemical change
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RELATED QUESTIONS
Explain the following giving an example.
Pure substance
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
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.
What is a chemical change ? Give two examples of chemical changes.
Which of the following are chemical changes ?
- decaying of wood
- burning of wood
- sawing of wood
- hammering of nail into wood
Define a chemical change. Give two examples of the above changes.
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
State which of the following pertain to – chemical changes.
- Substance retains its identity.
- The change is permanent.
- No new substance is formed.
- Is easily reversible.
- Produces one or more new substances by a change in its composition.
- The change is temporary.
- The composition and properties of the original substance are not altered.
Give an example of a physical change in which the color of the substance changes.
