3. Directions: Read the following sentences carefully. Write True on the blank if
the statement is correct and False if it is wrong.
16. When heat is applied to liquid water it solidifies.
17. When a piece of paper is burned it loses its original properties.
18. Physical change occurs when oxygen is used up in burning stick.
19. Fire goes out in a lighted candle when there is no oxygen.
20. Oxygen combines with the materials inside the body and
undergoes a chemical change.
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