NCERT Solutions For Class 9 Science Chapter 3: Atoms and Molecules is an important chapter that a candidate needs to learn since it lays the foundation for higher-level concepts in the syllabus of Class 9 and 10 Science as well as Class 11 and 12 Physics and Chemistry. We recommend students to study this chapter diligently and understand all the concepts.
If you get stuck anywhere, you can refer to the NCERT Solutions for Class 9 Science Chapter 3 provided in this article. Embibe’s academic experts have solved the questions present in this chapter. We have provided you with the NCERT Solutions for Class 9 Science Chapter 3 PDF so that you can download it and use it offline as well. This can help you with your studies and assignments. Solving these problems will help you understand the topics better.
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Table of Contents
NCERT Solutions For Class 9 Science Chapter 3: Atoms And Molecules
Before getting into the detailed NCERT Solutions Class 9 Science Chapter 3, let’s have an overview of topics and subtopics included in the Atoms and Molecules chapter. The different topics covered in this chapter are tabulated below. Click on any topic name to download the solutions as a PDF.
| Section | Topic Name |
| 3.1 | Laws of Chemical Combination |
| 3.2 | What is an Atom? |
| 3.3 | What is a Molecule? |
| 3.4 | Writing Chemical Formulae |
| 3.5 | Molecular Mass and Mole Concept |
Also, Check:
NCERT Solutions For Class 9 Science Chapter 3: Solved Exercises And In-Text Questions
The solutions for NCERT Science Class 9 Chapter 3 provided here on Embibe are solved by experts in an easy-to-understand language for all CBSE Class 9 students. This will help them understand the concepts, thus, encouraging active learning and not just rote learning.
DOWNLOAD CHAPTER 3 SCIENCE CLASS 9 NCERT SOLUTIONS PDF
- Chapter 1: Matter In Our Surroundings
- Chapter 2: Is Matter Around Us Pure
- Chapter 4: Structure of Atoms
- Chapter 5: The Fundamental Unit of Life
- Chapter 6: Tissues
- Chapter 7: Diversity in Living Organisms
- Chapter 8: Motion
- Chapter 9: Force and Laws of Motion
- Chapter 10: Gravitation
- Chapter 11: Work and Energy
- Chapter 12: Sound
- Chapter 13: Why Do We Fall Ill
- Chapter 14: Natural Resources
- Chapter 15: Improvement in Food Resources
Class 9 Science Chapter 3 NCERT Solutions: Chapter Summary
An atom is the smallest particle of an element. It can never exist independently and retain all its chemical properties. A molecule, on the other hand, is the smallest particle of an element or a compound which, unlike an atom, can exist independently and has the same properties of the substance. In this article, you will learn about atoms and molecules which in turn will help you have a basic understanding of the chemical sciences. Other important aspects like various laws of chemical sciences, how to write chemical formulas, etc. are also covered.
FAQs related to NCERT Solutions For Class 9 Science Chapter 3
Here we have provided some of the frequently asked questions related to Class 9 Science Chapter 3 Exercise Question Answer:
A: We know hydrogen and water mix in the ratio 1: 8.
For every 1g of hydrogen, it is 8g of oxygen.
Therefore, for 3g of hydrogen, the quantity of oxygen = 3 x 8 = 24g
Hence, 24g of oxygen would be required for the complete reaction with 3g of hydrogen gas.
A: The postulate of Dalton’s Atomic theory which is a result of the law of conservation of mass is,
“Atoms can neither be created nor destroyed”.
A: The postulate of Dalton’s atomic theory that can explain the law of definite proportions is – the
relative number and kinds of atoms are equal in given compounds.
(i) sodium oxide
(ii) aluminium chloride
(iii) sodium sulphide
(iv) magnesium hydroxide
A: The following are the formulae:
(i) sodium oxide – Na2O
(ii) aluminium chloride – AlCl3
(iii) sodium sulphide – Na2S
(iv) magnesium hydroxide – Mg (OH)2
(i) Al2(SO4)3
(ii) CaCl2
(iii) K2SO4
(iv) KNO3
(v) CaCO3.
A: Listed below are the names of the compounds for each of the following formulae
(i) Al2(SO4)3 – Aluminium sulphate
(ii) CaCl2 – Calcium chloride
(iii) K2SO4 – Potassium sulphate
(iv) KNO3 – Potassium nitrate
(v) CaCO3 – Calcium carbonate
(i) H2S molecule and
(ii) PO43- ion?
A: The number of atoms present is as follows:
(i) H2S molecule has 2 atoms of hydrogen and 1 atom of sulphur hence 3 atoms in totality.
(ii) PO43- ion has 1 atom of phosphorus and 4 atoms of oxygen hence 5 atoms in totality.
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