NCERT Solutions Class 9 Science Chapter 3: Atoms and Molecules

The third chapter of CBSE Class 9 Science is Atoms and Molecules. The chapter deals with the basic nature of atoms and molecules, their features and their characteristics. Students will also learn about the Laws of Chemical Combination, writing chemical formulae, and molecular mass mole concepts. Students should refer to the NCERT Solutions for Class 9 Science chapter 3 to know how to write comprehensive answers in the final exam.

Apart from the intext questions answered in the NCERT Solutions, students can also practice sample questions on each topic from the Embibe app. There are 470+ sample questions on the chapter 3 topics. It will help students memorise the key points of all the concepts and perform well in the exam. Read more about NCERT Solutions for Class 9 Science Chapter 3.

NCERT Solutions for Class 9 Science Chapter 3: Important Topics

Atoms and Molecules are one of the most straightforward concepts to understand. Once the concept surrounding Atoms and Molecules is clear, students can understand the advanced concepts easily. Students are advised to go through the concepts first to solve the questions easily. Solving as many questions as possible is advisable to develop speed and accuracy in problem-solving. The more the questions are practised, the easier to answer them in the final exam.

Embibe offers solutions to all the questions in the CBSE Class 9 Science chapter 3 textbook, considering the latest syllabus. Students can solve the questions at Embibe for free. Along with the free NCERT solutions, students can also access NCERT 3D Videos, NCERT Exemplars, Embibe Explainers, etc., for free at Embibe.

NCERT Solutions for Class 9 Science Chapter 3: Points to Remember

Students are advised to solve CBSE 9th Class Science chapter 3 practice questions on each topic from the Embibe app. It will help them retain the most important points well. We have provided some of the important points to remember for Class 9 Science chapter 3 as mentioned below:

• Laws of Chemical Combination:
  (i)The combination between the elements is governed by laws of chemical combination.
  (ii) The law of conservation of mass was given by Lavoisier.
  (iii) Louis Proust gave the law of constant proportions.
  (iv) The law of constant proportions is applicable only to pure chemical compounds.
• Atom:
  (i) John Dalton was the first to state that atom is the smallest indivisible part of the matter.
  (ii) Atom is the smallest tiny particle of matter which can take part in chemical combination. It may or may not exist independently.
  (iii) Dalton’s Atomic theory has certain limitations or defects.
  (iv) Scanning tunnelling microscope (STM) can be used to have a pictorial view of the atoms.
  (v) Symbols of elements give the shorthand representation of the name of elements.
  (vi) Chemical symbols for the elements were given by Berzelius.
  (vii) No two elements can have the same symbol. Isotopes of an element have the same symbol.
  (viii) Atomic masses of the elements are relative masses and not their actual masses.
• Molecule:
  (i) In a molecule, the atoms of the same or different elements are chemically bonded to each other.
  (ii)The number of atoms present in one element molecule represents its atomicity.
  (iii) Noble gases are monoatomic.
  (iv)An ion is an atom or group of atoms having a positive or negative charge.
  (v)A cation has a positive charge whereas an anion has a negative charge
  (vi)Number of electrons and protons in a neutral atom is equal. Cations as well as anions of an atom do not have an equal number of electrons and protons.
• Writing chemical formula:
  (i) Chemical formula is the representation of a molecule in terms of the symbols of the constituting atoms.
  ii) Valency of an element is the combining capacity of its atoms

NCERT Solutions for Class 9 Science: All Chapters

To help students study other CBSE Class 9 Science chapters, we have provided links to access the NCERT Solutions for 9th class Science subject. They can take Class 9 Science free mock tests on the Embibe app and evaluate their performance. Students can check the topics covered, and points to remember from all the chapter’s links below:

FAQs on CBSE NCERT Solutions for Class 9 Science Chapter 3

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