Physical and chemical changes PDF

THE INDIAN HIGH SCHOOL, DUBAI

WORKSHEET

GRADE 7

PHYSICAL AND CHEMICAL CHANGES

1. Burning of paper is a --------------- change

2. The chemical formula of iron oxide is --------------

3. Melting of wax is a ----------------change

4. A ----------- is the smallest particle of an element or a compound that can exist

by itself

5. Two atoms of an element combine to form a ----------------.

6. Which of the following is a chemical change?

a) bursting of a fire cracker b) germination of seed c) coal formation d) all of

these

7. How crystals of pure substance are obtained

a) Crystallization b) chromatography c) sedimentation d) galvanization

8. In which type of change a new substance is formed

a) Physical change b) chemical change c) in both

9. Common salt is produced from sea water by

a) Evaporation and crystallization c) only evaporation

10. A reversible change is

a) is a chemical change b) is a physical change c) forms new substance