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NCERT Solutions for Class 9 Science Chapter 3 Atoms And Molecules

by aglasem
August 27, 2021
in 9th Class
Reading Time: 1 min read
0
NCERT Solutions

NCERT Solutions Class 9 Maths Chapter 3 Atoms And Molecules – Here are all the NCERT solutions for Class 9 Maths Chapter 3. This solution contains questions, answers, images, explanations of the complete Chapter 3 titled The Fun They Had of Maths taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Maths, then you must come across Chapter 3 Atoms And Molecules. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 9 Maths Chapter 3 Atoms And Molecules in one place.

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NCERT Solutions Class 9 Science Chapter 3 Atoms And Molecules

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Here on AglaSem Schools, you can access to NCERT Book Solutions in free pdf for Science for Class 9 so that you can refer them as and when required. The NCERT Solutions to the questions after every unit of NCERT textbooks aimed at helping students solving difficult questions.

For a better understanding of this chapter, you should also see summary of Chapter 3 Atoms And Molecules , Science, Class 9.

Class 9
Subject Science
Book Science
Chapter Number 3
Chapter Name

Atoms And Molecules

NCERT Solutions Class 9 Science chapter 3 Atoms And Molecules

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Class 9, Science chapter 3, Atoms And Molecules solutions are given below in PDF format. You can view them online or download PDF file for future use.

Atoms And Molecules Download

NCERT Solutions for Class 9 Science Chapter 3 Atoms and Molecules Download

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Download NCERT Solutions Class 9 Science chapter 3 Atoms And Molecules In PDF Format

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Question & Answer

Q.1: In a reaction, 5.3 g of sodium carbonate reacted with 6 g of acetic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium acetate. Show that these observations are in agreement with the law of conservation of mass.
sodium carbonate + acetic acid → sodium acetate + carbon dioxide + water

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

Q.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?

Ans : 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 x 3 g = 24 g.

Q.3: Which postulate of Dalton’s atomic theory is the result of 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 are indivisible particles, which can neither be created nor destroyed in a chemical reaction.

Q.4: Which postulate of Dalton’s atomic theory can explain the law of definite proportions?

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

Q.5: . Define the atomic mass unit?

Ans : Mass unit equal to exactly one-twelfth the mass of one atom of carbon-12 is called one atomic mass unit. It is written as 'u'.

NCERT / CBSE Book for Class 9 Science

You can download the NCERT Book for Class 9 Science in PDF format for free. Otherwise you can also buy it easily online.

  • Click here for NCERT Book for Class 9 Science
  • Click here to buy NCERT Book for Class 9 Science

All NCERT Solutions Class 9

  • NCERT Solutions for Class 9 English
  • NCERT Solutions for Class 9 Hindi
  • NCERT Solutions for Class 9 Maths
  • NCERT Solutions for Class 9 Science
  • NCERT Solutions for Class 9 Social Science
  • NCERT Solutions for Class 9 Sanskrit

All NCERT Solutions

You can also check out NCERT Solutions of other classes here. Click on the class number below to go to relevant NCERT Solutions of Class 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

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Class 7 Class 8 Class 9
Class 10 Class 11 Class 12

Download the NCERT Solutions app for quick access to NCERT Solutions Class 9 Science Chapter 3 Atoms And Molecules. It will help you stay updated with relevant study material to help you top your class!


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