Fill in the blanks in the following statements:
(a) When carbon dioxide is passed through lime water, it turns milky due to the formation of _________.
(b) The chemical name of baking soda is _________.
(c) Two methods by which rusting of iron can be prevented are _________ and _________.
(d) Changes in which only _________ properties of a substance change are called physical changes.
(e) Changes in which new substances are formed are called _________ changes.
NCERT Solutions for Class 7th Science Chapter 6 Physical and Chemical Changes Page 66 Exercise Question 3

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Answers

2015-05-18T21:28:06+05:30
a. Calcium Carbonate (CaCO3)
b. Sodium Hydrogen Carbonate or Sodium Bicarbonate
c. by applying paint or grease and by theĀ coating of zinc which is called Galvanisation.
d. physical
e. chemical.
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2015-05-18T21:37:29+05:30
A) CO2 reacts with calcium carbonate. B) Sodium bicarbonate. C) 1.keeping away from moisture 2.paint the metallic surface D) Physical E) chemical changes
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