NCERT Solutions for Class 9 Science Chapter 3: Get PDF - Embibe
  • Written By Ravikant_Yadav
  • Last Modified 03-08-2022
  • Written By Ravikant_Yadav
  • Last Modified 03-08-2022

NCERT Solutions Class 9 Science Chapter 3

NCERT Solutions for Class 9 Science Chapter 3: The chapter covers all the basics of Atoms and Molecules. The chapter is of significant importance since the primary understanding of atoms and molecules is necessary to understand its dependent and complex topics in Class X, XI, and XII. The topic is also important regarding career prospects in Chemistry and Biotechnology. Students are advised to thoroughly study this chapter and get all their basic doubts cleared. 

NCERT Solutions for Class 9 Science Chapter 3 explains the intext exercise questions in the textbook. It will help students clear their confusion and attempt the answers correctly. We have provided the NCERT Solutions for Class 9 Science Chapter 3 PDF in this article so that you can download it and use it offline.

Solutions for Class 9 Science Chapter 3: Atoms & Molecules

Before getting into the detailed NCERT Solutions Class 9 Science Chapter 3, let us have an overview of topics and subtopics included in the Atoms and Molecules chapter. The different topics covered in this chapter are tabulated below.

SectionTopic Name
3.1Laws of Chemical Combination
3.2What is an Atom?
3.3What is a Molecule?
3.4Writing Chemical Formulae
3.5Molecular Mass and Mole Concept

Free PDF Solutions for Class 9 Science Chapter 3

Also, Check:

CBSE Class 9 English SyllabusNCERT Class 9 English Book
CBSE Class 9 Maths SyllabusNCERT Class 9 Maths Book
CBSE Class 9 Science SyllabusNCERT Class 9 Science Book
CBSE Class 9 Social Science SyllabusNCERT Class 9 Social Science Book
CBSE Class 9 Hindi SyllabusNCERT Class 9 Hindi Book

NCERT Solutions for Class 9 Science Chapter 3: Solved Intext Questions and Solutions

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 rote learning.

To help students continue their preparation for Class 9 Science using the NCERT Solutions, we have provided links to all the chapters in CBSE Class 9 Syllabus 2022-23. Students are recommended to- download the Solutions from the links given below and keep them handy while studying the concerned topics.
NCERT Solutions are very practical in clearing the doubts of students and also saves them a lot of time otherwise spent on clarifying those doubts with the teachers. After learning a chapter from the NCERT textbook, students can go through the solutions to all the intext questions. It is also advisable to check the answers against those given in the NCERT Solutions so that one may know their strengths and weaknesses and prepare for the exam accordingly.

Class 9 Science Chapter 3 NCERT Solutions: Summary

An atom is the smallest particle of an element. It can never exist independently and retain all its chemical properties. On the other hand, a molecule is the smallest particle of a part of a compound which, unlike an atom, can exist independently and has the same properties as the substance. In this article, students will learn about atoms and molecules, which will help them 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.

Benefits of NCERT Solutions for Class 9 Chapter 3

Let us look at some of the advantages of solving Embibe’s NCERT Solutions for Class 9 Chapter 3.

  • Embibe’s NCERT solutions help students understand ideas and assist them in developing strategies to help them succeed in tests.
  • Preparing from Embibe’s NCERT Solutions Class 9 is an excellent technique for students to grasp the chapter’s subjects.
  • A detailed examination of topics is provided, along with their weightage to aid students in their preparation.
  • Our specialists develop these NCERT Solutions in a highly simplified way that students easily understand.
  • Students can use these NCERT solutions for last-minute preparation or revision without any difficulty.
  • Along with scoring good marks in Class 9 final exam, NCERT solutions will also help students prepare for their upcoming entrance level examinations.

In order to score good marks in your Class 9 Science paper, students must make sure they solve all the questions from the NCERT Solutions, which is provided in this article, which can be downloaded for free. Solving previous years’ question papers is also an excellent idea to enhance the exam preparation.

To help students achieve maximum scores, we have provided a list of important books for Class 9th. Students can study the subjects from these 3D interactive books and attempt mock tests to build a strong conceptual foundation in the topics and boost confidence to excel in the exam. 

FAQs on NCERT Solutions for Class 9 Chapter 3

Q1: 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 3g of hydrogen gas? 

Ans: We know hydrogen and water mix 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. 

Q2: Which postulate of Dalton’s atomic theory results from the law of conservation of mass? 

Ans: 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”.

Q3Which postulate of Dalton’s atomic theory can explain the law of definite proportions? 

Ans: 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.

Q4: Write down the formulae of (i) sodium oxide, (ii) aluminium chloride, (iii) sodium sulphide and (iv) magnesium hydroxide?

Ans: The following are the formulae: (i) sodium oxide – Na2O, (ii) aluminium chloride – AlCl3, (iii) sodium sulphide – Na2S and (iv) magnesium hydroxide – Mg (OH)2.

Q5: How many atoms are present in a (i) H2S molecule and (ii) PO43- ion? 

Ans: The number of atoms present is as follows: (i) H2S molecule has 2 atoms of hydrogen and 1 atom of sulphur, hence 3 in totality and (ii) PO43- ion has 1 atom of phosphorus and 4 atoms of oxygen hence 5 atoms in totality. 

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