Question

2. What is meant by saying that 'the molecular mass of oxygen is 32' ?
2. Fill in the following blanks with suitable words:

1 Answer Type Questions
(a) Name the element used as a standard for atomic mass scale.
(b) Which particular atom of the above element is used for this purpose ?
(c) What value has been given to the mass of this reference atom?
2.Give one major drawback of Dalton's atomic theory of matter.
3.Dalton's atomic theory says that atoms are indivisible. Is this statement
answer.
Is it possible to see atoms these days ? Explain your answer.
What is meant by the symbol of an element ? Explain with examples.​

Answer 1

Answer:

What is meant by saying that 'the molecular mass of oxygen is 32'? Solution: This means that a molecule of oxygen is 32 times heavier than 1/12 of a Carbon-12 atom

Answer 2

What is meant by saying that ‘the molecular mass of oxygen is 32’?

Solution:

This means that a molecule of oxygen is 32 times heavier than 1/12 of a Carbon-12 atom.

Fill in the following blanks with suitable words:

(a) In water, the proportion of oxygen and hydrogen is _____ by mass.

(b) In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called _____.

Solution:

(a) 1:8

(b) Conservation of mass

Short Answer Type Questions

21. (a) Name the element used as a standard for atomic mass scale.

(b) Which particular atom of the above element is used for this purpose?

(c) What value has been given to the mass of this reference atom?

Solution:

(a) Carbon is used as a standard for atomic mass scale.

(b) Atom with 6 neutrons and 6 protons in its nucleus so that its mass number is 12.

(c) Mass of this atom is 12 u.