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Question
Classify the following as physical or chemical properties
Metallic sodium is soft enough to be cut with a knife.
Solution
Physical property
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Dissolving of a solid in liquid is a physical 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.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the following as physical or chemical change :
Growth of a plant
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Select the chemical changes from the following list of changes
Vaporisation of water into water vapour.
Digestion of food is a physical change.
Mention some of the different conditions needed for chemical changes to occur.
