Changes around us Worksheet-1

Changes around us Worksheet-1

Fill in the blanks:

1. The three physical states of water are__________ (reversible/ irreversible)
2. Burning of paper is a/an ___________ change.
3. Ice can be changed back to water by melting, so it is called a ________ change.
4. Molten ice cream can be changed back to its _______ form.
5. Growth in animals and plants is an example of ________ change.
6. _______ of milk is done by adding lemon juice to milk for making cottage cheese.
7. Burning is _______ change.
8. Changes in which no new substances are formed are called _______ changes.
9. Cooking of food, growth in plants and animals, burning of substances are _________ changes.
10. Ripening of fruits is an example of _________ change.
11. Freezing of water is an example of ________ change.
12. Tearing of paper is a _________ change.
13. _________ causes water to change into steam.
14. James Prescott Joule studied the nature of heat, and discovered its relationship to ________ work.
15. Water expands on heating; it is called _________ in liquids.

Answer Key:

1. Reversible
2. irreversible/ chemical
3. reversible/ physical
4. solid /original
5. chemical
6. curdling
7. irreversible/ chemical
8. physical
9. irreversible/ chemical
10. irreversible/ chemical
11. reversible/ physical
12. Physical/ reversible
13. heating/ heat
14. mechanical
15. expansion