Class 9 NCERT Solutions Atoms and Molecules

Class 9 NCERT Solutions Atoms and Molecules with answers available in Pdf for free download. The NCERT Solutions for Class 9 Science with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 9 by CBSE, NCERT and KVS. Solutions to questions given in NCERT book for Class 9 Science are an important part of exams for Grade 9 Science and if practiced properly can help you to get higher marks. Refer to more Chapter-wise Solutions for NCERT Class 9 Science and also download more latest study material for all subjects

Atoms and Molecules Class 9 NCERT Solutions

Class 9 Science students should refer to the following NCERT questions with answers for Atoms and Molecules in standard 9. These NCERT Solutions with answers for Grade 9 Science will come in exams and help you to score good marks

Atoms and Molecules NCERT Solutions Class 9

Class 9 NCERT Solutions Atoms and Molecules - NCERT Solutions prepared for CBSE students by the best teachers in Delhi. 

Class IX Chapter 3 – Atoms and Molecules Science

Question 1:

In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.

Sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water

Answer:

In the given reaction, sodium carbonate reacts with ethanoic acid to produce sodium ethanoate, carbon dioxide, and water.

Mass of sodium carbonate = 5.3 g (Given)

Mass of ethanoic acid = 6 g (Given)

Mass of sodium ethanoate = 8.2 g (Given)

Mass of carbon dioxide = 2.2 g (Given)

Mass of water = 0.9 g (Given)

Now, total mass before the reaction = (5.3 + 6) g

= 11.3 g

And, total mass after the reaction = (8.2 + 2.2 + 0.9) g

= 11.3 g

∴Total mass before the reaction = Total mass after the reaction

Hence, the given observations are in agreement with the law of conservation of mass.

 

Question 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 g of hydrogen gas?

Answer:

It is given that the ratio of hydrogen and oxygen by mass to form water is 1:8. Then, the mass of oxygen gas required to react completely with 1 g of hydrogen gas is 8 g. Therefore, the mass of oxygen gas required to react completely with 3 g of hydrogen

gas is 8 × 3 g = 24 g.


Question 3:

Which postulate of Dalton’s atomic theory is the result of the law of conservation of mass?

Answer:

The postulate of Dalton’s atomic theory which is a result of the law of conservation of mass is:

Atoms are indivisible particles, which can neither be created nor destroyed in a chemical reaction.

Question 4:

Which postulate of Dalton’s atomic theory can explain the law of definite proportions?

Answer:

The postulate of Dalton’s atomic theory which can explain the law of definitevproportion is: The relative number and kind of atoms in a given compound remains constant.

 

 

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Chapter 1 Matter In Our Surroundings
Class 9 NCERT Solutions Matter in Our Surroundings
Chapter 2 Is Matter Around Us Pure?
Class 9 NCERT Solutions Is Matter Around Us Pure
Chapter 3 Atoms and Molecules
Class 9 NCERT Solutions Atoms and Molecules
Chapter 4 Structure Of The Atom
Class 9 NCERT Solutions Structure of the Atom
Chapter 5 The Fundamental Unit Of Life
Class 9 NCERT Solutions The Fundamental Unit of Life
Chapter 6 Tissues
Class 9 NCERT Solutions Tissues
Chapter 7 Diversity In Living Organisms
Class 9 NCERT Solutions Diversity in Living Organisms
Chapter 8 Motion
Class 9 NCERT Solutions Motion
Chapter 9 Force and Laws Of Motion
Class 9 NCERT Solutions Force and Laws of Motion
Chapter 10 Gravitation
Class 9 NCERT Solutions Gravitation
Chapter 11 Work and Energy
Class 9 NCERT Solutions Work and Energy
Chapter 12 Sound
Class 9 NCERT Solutions Sound
Chapter 13 Why Do We Fall Ill?
Class 9 NCERT Solutions Why Do We Fall Ill
Chapter 14 Natural Resources
Class 9 NCERT Solutions Natural Resources
Chapter 15 Improvement In Food Resources
Class 9 NCERT Solutions Improvement in Food Resources

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