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Chemistry
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Lakhmir Singh
1
Chapter 1: Matter in Our Surroundings
155 questions
2
Chapter 2: Is Matter Around Us Pure?
228 questions
3
Chapter 3: Atoms and Molecules
177 questions
Q1
Question 18:
Define 'molecular mass' of a substance.
Q2
Question 19:
What is meant by saying that 'the molecular mass of oxygen is 32' ?
Q3
Question 20:
Fill 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 ....................
View all question(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 ....................
4
Chapter 4: Structure of the Atom
133 questions
Question
Question 19: What is meant by saying that 'the molecular mass of oxygen is 32' ?
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Answer:
The statement, "the molecular mass of oxygen is 32", means that a molecule of oxygen is 32 times heavier than 1/12th of the mass of a atom.
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Practice more questions from Chemistry (Lakhmir Singh)
Q1
Question 18:
Define 'molecular mass' of a substance.
Q2
Question 19:
What is meant by saying that 'the molecular mass of oxygen is 32' ?
Q3
Question 20:
Fill 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 ....................
View all(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 ....................
Practice questions from Chemistry (Lakhmir Singh)
Question 2
Views: 5,792
(a) Hydrogen, H2
(b) Oxygen, O2
(c) Chlorine, Cl2
(d) Ammonia, NH3
(e) Carbon dioxide, CO2
(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)
Question 3
Views: 5,207
(b) What is a molecule ? Explain with an example.
(c) What is the difference between the molecule of an element and the molecule of a compound ? Give one example of each.
Question 4
Views: 5,295
(a) more electrons than the normal atoms ?
(b) less electrons than the normal atoms ?
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| Question Text | Question 19:
What is meant by saying that 'the molecular mass of oxygen is 32' ? |
| Topic | Atoms and Molecules |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 43 |
