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.
NCERT Solutions Class 9 Science Chapter 3 Atoms And Molecules
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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
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.
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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'.
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