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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
An example of both physical and chemical change is
पर्याय
burning of candle
melting of ice
cooking of food
blowing of bulb
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उत्तर
burning of candle
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संबंधित प्रश्न
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
What role does energy play in initiating 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
True or false
Dissolving of a solid in liquid is a physical change.
Write true or false
Decomposition of leaves is a fast change.
What is a chemical change ? Give two examples of chemical changes.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
Which of the following is not a physical change?
