Advertisements
Advertisements
प्रश्न
Which of the following are physical changes and which are chemical changes?
Burning of candle wax, Melting of candle wax, Mixing of iron filings and sand, Burning of wood, Breaking a piece of chalk, Burning a piece of paper, Cutting a piece of paper.
उत्तर
Physical change: Melting of candle wax, mixing of iron filings and sand, Breaking a piece of chalk, and Cutting a piece of paper.
Chemical change: Burning of candle wax, burning of wood, and Burning a piece of paper.
APPEARS IN
संबंधित प्रश्न
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
Write true or false for the statement
Decomposition of leaves is a fast change.
Ripening of fruits is a desirable change.
State the differences between a physical change and a chemical change.
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
Classify the following changes as physical or chemical:- photosynthesis in plants
Define physical change. Give two examples for the above changes.
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Differentiate between a physical change and a chemical change with reference to – Formation of products.
Natural changes which take place in nature on their own, are beyond the control of human being.
