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Question
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.
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Solution
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RELATED QUESTIONS
Classify the following as chemical or physical change:
Burning of paper and wood
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
State whether the following is physical or chemical changes.
glowing of a bulb -
Write true or false
Burning of sugar is a temporary change.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
The rusting of an iron object is called :
What will you take into account while identifying the following?
A chemical change in a substance.
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
Name the following.
A form of energy required for a chemical change.
Gas exists in three states as solid, liquid, and gas.
