Q.11: Answer the following:
1. Melting of wax is a change where a solid
changes to liquid state. Give one more such
change which you observe in your surroundings.
2.Name the process by which common salt is
obtained from sea water.
3. Suggest two methods to prevent rusting.
4. Give any two examples of matter?
5. Write the differences between physical and
chemical changes
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Answer:
1. Ice to water - Ice melts back into water when it is left out at temperatures above the freezing point of 32 degrees.
2. Evaporation is the process by which common salt is obtained from sea water.
3. Apply Oil and Apply a Dry Coating
4. Ice and tree
5. In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed
Explanation:
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