Fill in the blanks in the following statements: Nalini observed that the handle. Class 7
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Fill in the blanks in the following statements: Nalini observed that the handle. Class 7
Question 1.
Fill in the blanks in the following statements: Nalini observed that the handle. Class 7
(i) Nalini observed that the handle of her cycle bas got brown deposits. The brown deposits are due to _____, and this is a _____ change.
Answer:
rusting, chemical
(ii) Folding a handkerchief is a _____ change and can be _____ .
Answer:
physical, reversed
(iii) A chemical process in which a substance reacts with oxygen with evolution of heat is called , and this is a ____ change.
Answer:
combustion, chemical
(iv) Magnesium, when burnt in air, produces a substance called . The substance formed is _______ in nature. Burning of magnesium is a _____ change.
Answer:
magnesium oxide, basic, chemical