Chapter 3, Science (Chemistry) - Atoms and Molecules
In text Questions
NCERT Science Text Book Page 32
Q.1: In a reaction, 5.3 gm of sodium carbonate reacted with 6 gm of ethanoic acid. The products were 2.2 gm of carbon dioxide, 0.9 gm water and 8.2 gm sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.
Q.2: Hydrogen and oxygen combine in the ratio of 1:8 by mass to form water. What mass of oxygen gas would be required to react completely with 3 gm of hydrogen gas ?
Q.3: Which postulate of Dalton’s Atomic Theory is the result of the law of conservation of mass ?
Q.4: Which postulate of Dalton’s Atomic Theory can explain the law of definite proportions ?
NCERT Science Text Book Page 35
Q.1: Define the Atomic Mass Unit.
Q.2: Why is it not possible to see an atom with naked eyes ?
NCERT Science Text Book Page 39
Q.1: Write down the formulae of
(i) sodium oxide
(ii) aluminium chloride
(iii) sodium sulphide
(iv) magnesium hydroxide
Q.2: Write down the names of compounds represented by the following formulae:
(i) Al2(SO4)3, (ii) CaCl2, (iii) K2SO4, (iv) KNO3, (v) CaCO3
Q.3: What is meant by the term chemical formula ?
Q.4: How many atoms are present in a
(i) H2S molecule and (ii) PO43– ion ?
NCERT Science Text Book Page 40
Q.1: Calculate the molecular masses of H2, O2, Cl2, CO2, CH4, C2H6, C2H4, NH3, CH3OH.
Q.2: Calculate the formula unit masses of ZnO, Na2O, K2CO3, given atomic masses of Zn = 65u, Na = 23u, K = 39u, C = 12u and O = 16u
NCERT Science Text Book Page 42
Q.1: If one mole of carbon atoms weighs 12 gm, what is the mass (in gm) of 1 atom of carbon ?
Further study on this chapter -
=> Atoms and Molecules | Class IX Science (Chemistry) | NCERT (CBSE) Textbook Exercise Solved [Read]
=> Class IX, NCERT (CBSE) | Chapter 3, Atoms and Molecules | Extrascore Multiple Choice Questions (MCQ) [Read]
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