Chapter Exercise - Page: 12 1. Convert the following temperature to Celsius scale. (a) 293K (b) 470K Solution: 0°C=273K (a) 293K= (293 - 273)°C = 20°C (b) 470K= (470 - 273)°C = 197°C 2.Convert the following temperatures to the Kelvin scale. (a) 25°C (b) 373°C Solution: 0°C = 273K (a) 25°C = (25+273)K = 298K (b) 373°C = (373+273)K = 646K 3. Give reason for the following observations: (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume while sitting several metres away. Solution: (a) At room temperature, naphthalene balls undergo sublimation wherein they directly get converted from a solid to a gaseous state without having to undergo the intermediate state, i.e., the liquid state. (b) Molecules of air move at a higher speed and have large intermolecular spaces. Perfumes comprise of flavoured substances that are volatile which scatters quickly in air, becoming less concentrated over a distance. Hence we are able to smell perfume sitting several metres away. 4. Arrange the following in increasing order of forces of attraction between the particles - water, sugar, oxygen. Solution: Oxygen (gas) < water (liquid) < sugar (solid) 5. What is the physical state of water at - (a) 25°C (b) 0°C (c) 100°C? Solution: (a) At 25°C, the water will be in liquid form (normal room temperature) (b) At 0°C, the water is at its freezing point, hence both solid and liquid phases are observed. (c) At 100°C, the water is at its boiling point, hence both liquid and gaseous state of water (water vapour) are observed. 6.Give two reasons to justify - (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature. Solution: (a) Water persists as a liquid at room temperature since its melting point is lower than room temperature and its boiling point (100o C) is higher. Similarly, (i). A fixed volume is occupied by a fixed mass of water. (ii). At room temperature, water does not have a fixed shape and flows to fit the container’s shape. As a result, water is a liquid at room temperature. (b) Because its melting and boiling points are both above room temperature, an iron almirah is a solid at room temperature. In the same way, (i) An iron almirah is rigid and has a predetermined shape. (ii) Metals have a relatively high density. As a result, at room temperature, iron almirah is a solid. 7. Why is ice at 273K more effective in cooling than water at the same temperature? Solution: At 273 K, ice will absorb heat energy or latent heat from the medium in order to overcome fusion and transform into water. As a result, ice has a greater cooling impact than water at the same temperature since water does not absorb the excess heat from the medium. 8. What produces more severe burns, boiling water or steam? Solution: Steam produces severe burns. It is because it is an exothermic reaction that releases a high amount of heat which it had consumed during vaporization. 9. Name A, B, C, D, E and F in the following diagram showing a change in its state.  Solution: Interconversion of three states of matter: Using temperature or pressure, any state of matter can be turned into another. (A) Solid to Liquid → Melting (or) fusion (or) liquefaction (B) Liquid to Gas → Evaporation (or) vaporization (C) Gas to liquid → Condensation (D) Liquid to Solid → Solidification (E) Solid to Gas → Sublimation (F) Gas to Solid → solidification Also Access NCERT Exemplar Solutions for Class 9 Science Chapter 1CBSE Notes for Class 9 Science Chapter 1 NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings Chapter 1 - Matter in Our Surroundings is a part of Unit 1: Matter - Its Nature and Behavior. According to the past trends and previous years question papers, this particular unit carries 23 marks out of 100. Therefore, it is quite important to ensure that this chapter is studied thoroughly. The topics and subtopics from NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings are given below: Physical nature of matterMatter is Made Up of ParticlesHow Small Are These Particles Of Matter?Characteristic of particles of matterParticles of Matter Have Space between ThemParticles of Matter Are Continuously MovingParticles of Matter Attract Each OtherStates of matterThe Solid StateThe Liquid StateThe Gaseous StateCan matter change its state?Effect of Change of TemperatureEffect of Change o PressureEvaporationFactors Affecting EvaporationHow Does Evaporation Cause Cooling? Students can utilise the NCERT Solutions for Class 9 Science Chemistry Chapter 1 for any quick references to comprehend complex topics. Matter is one of the fundamental constituents that make up everything in the universe - from minute sand particles on earth to the enigmatic black holes at the centre of many galaxies. Matter has a role to play in everything that we see around us, interacting to form new materials, some familiar and others exotic. Explore how matter works and discover its molecular components. Also, learn how the term matter was coined and its significance in various fields of science. Find more important NCERT Solutions For Class 9 Science to aid your studies. Exercises with Question count covered in NCERT Solutions for Class 9 Chapter 1: Matter in Our Surroundings Exercise 1.1 & 1.2, Page number 3 - Solutions of 4 Questions Exercise 1.3, Page number 6 - Solutions of 4 Questions Exercise 1.4, Page number 9 - Solutions of 4 Questions Exercise 1.5, Page number 10 - Solutions of 5 Questions Chapter Exercise, Page number 12 - Solutions of 9 Questions Key Features of NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings Content elaborated in detail, ensuring all jargons are explainedSolutions have been written in an easy-to-understand languageCrafted by qualified teachers and industry expertsIncludes questions from the latest prescribed syllabusComprehensive analysis of previous year exam questionsExplore additional learning tools such as sample papers and previous year question papers Disclaimer: Dropped Topics - Box item titled ‘Plasma and Bose-Einstein Condensate’. Frequently Asked Questions on NCERT Solutions for Class 9 Science Chapter 1 Explain the different characteristics of state of matter covered in the Chapter 1 of NCERT Solutions for Class 9 Science. The different characteristics of state of matter are based on six parameters - 1. Shape 2. Volume 3. Rigidity or Fluidity 4. Intermolecular force 5. Intermolecular space 6. Compressibility These concepts are briefly explained in the NCERT Solutions for Class 9 Science Chapter 1 curated by the experts at BYJU’S. The solutions are elaborated in a simple language to make it easier for the students while learning. How many questions are present in each exercise of NCERT Solutions for Class 9 Science Chapter 1? The number of questions present in each exercise of NCERT Solutions for Class 9 Science Chapter 1 are - Exercise 1.1 & 1.2 - 4 Questions Exercise 1.3 - 4 Questions Exercise 1.4 - 4 Questions Exercise 1.5 - 5 Questions Chapter Exercise - 9 Questions Is the NCERT Solutions for Class 9 Science Chapter 1 sufficient for the exam preparation? The NCERT Solutions for Class 9 Science Chapter 1 are designed by the faculty at BYJU’S to help students ace the exam without fear. The fundamental concepts are explained in the most systematic way to improve the confidence among students. Each and every minute detail is covered in the NCERT Solutions to help students with their exam preparation. The solutions are available in both online and offline mode which can be used by the students based on their requirements.     Join BYJU'S Learning Program Grade/Exam Class 1 Class 2 Class 3 Class 4 Class 5 Class 6 Class 7 Class 8 Class 9 Class 10 Class 11 Class 12 IAS CAT Bank Exam GATE Submit 7 Comments Jiya Ghosh JULY 23, 2020 AT 12:10 AM I really like byjus and answer are hundred percent good 👌👌👌👌👌👌 best experience ever REPLY Asha OCTOBER 18, 2020 AT 7:22 PM Thanks for this science book chapter 1 qus. And ans. Thank you very much 👏👏👏 REPLY Shaivi MARCH 30, 2022 AT 9:55 PM Loved it REPLY Shashank Kumar APRIL 12, 2022 AT 7:35 PM My experience with byju’s is 2 good. It’s amazing REPLY Fiza APRIL 13, 2022 AT 3:33 PM It’s very helpful Thnx byjus. REPLY Daksh saini APRIL 24, 2022 AT 1:42 PM Thanks for this science book chapter 1 qus. And ans. Thank you very much 👏👏👏 REPLY rudra JUNE 7, 2022 AT 10:24 AM It’s very helpful Thnx byjus. REPLY Leave a Comment Your Mobile number and Email id will not be published. Required fields are marked * * Send OTP * Post Comment COURSES CBSEICSECATIASJEENEETCommerceJEE MainNCERTJEE AdvancedUPSC Prelims 2022 Question PaperUPSC Prelims 2022 Answer KeyIAS CoachingCBSE Sample PapersCBSE Question Papers
Chapter Exercise - Page: 12
1. Convert the following temperature to Celsius scale.
(a) 293K (b) 470K
Solution:
0°C=273K
(a) 293K= (293 - 273)°C = 20°C
(b) 470K= (470 - 273)°C = 197°C
2.Convert the following temperatures to the Kelvin scale.
(a) 25°C (b) 373°C
Solution:
0°C = 273K
(a) 25°C = (25+273)K = 298K
(b) 373°C = (373+273)K = 646K
3. Give reason for the following observations:
(a) Naphthalene balls disappear with time without leaving any solid.
(b) We can get the smell of perfume while sitting several metres away.
Solution:
(a) At room temperature, naphthalene balls undergo sublimation wherein they directly get converted
from a solid to a gaseous state without having to undergo the intermediate state, i.e., the liquid state.
(b) Molecules of air move at a higher speed and have large intermolecular spaces. Perfumes comprise
of flavoured substances that are volatile which scatters quickly in air, becoming less concentrated over a distance. Hence we are able to smell perfume sitting several metres away.
4. Arrange the following in increasing order of forces of attraction between the particles - water, sugar, oxygen.
Solution:
Oxygen (gas) < water (liquid) < sugar (solid)
5. What is the physical state of water at -
(a) 25°C (b) 0°C (c) 100°C?
Solution:
(a) At 25°C, the water will be in liquid form (normal room temperature)
(b) At 0°C, the water is at its freezing point, hence both solid and liquid phases are observed.
(c) At 100°C, the water is at its boiling point, hence both liquid and gaseous state of water (water
vapour) are observed.
6.Give two reasons to justify -
(a) Water at room temperature is a liquid.
(b) An iron almirah is a solid at room temperature.
Solution:
(a) Water persists as a liquid at room temperature since its melting point is lower than room temperature and its boiling point (100o C) is higher.
Similarly,
(i). A fixed volume is occupied by a fixed mass of water.
(ii). At room temperature, water does not have a fixed shape and flows to fit the container’s shape.
As a result, water is a liquid at room temperature.
(b) Because its melting and boiling points are both above room temperature, an iron almirah is a solid at room temperature. In the same way,
(i) An iron almirah is rigid and has a predetermined shape.
(ii) Metals have a relatively high density.
As a result, at room temperature, iron almirah is a solid.
7. Why is ice at 273K more effective in cooling than water at the same temperature?
Solution:
At 273 K, ice will absorb heat energy or latent heat from the medium in order to overcome fusion and transform into water. As a result, ice has a greater cooling impact than water at the same temperature since water does not absorb the excess heat from the medium.
8. What produces more severe burns, boiling water or steam?
Solution:
Steam produces severe burns. It is because it is an exothermic reaction that releases a high amount of heat which it had consumed during vaporization.
9. Name A, B, C, D, E and F in the following diagram showing a change in its state.

Solution:
Interconversion of three states of matter: Using temperature or pressure, any state of matter can be turned into another.
(A) Solid to Liquid → Melting (or) fusion (or) liquefaction
(B) Liquid to Gas → Evaporation (or) vaporization
(C) Gas to liquid → Condensation
(D) Liquid to Solid → Solidification
(E) Solid to Gas → Sublimation
(F) Gas to Solid → solidification
Also Access NCERT Exemplar Solutions for Class 9 Science Chapter 1CBSE Notes for Class 9 Science Chapter 1
NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings
Chapter 1 - Matter in Our Surroundings is a part of Unit 1: Matter - Its Nature and Behavior. According to the past trends and previous years question papers, this particular unit carries 23 marks out of 100. Therefore, it is quite important to ensure that this chapter is studied thoroughly.
The topics and subtopics from NCERT Solutions Class 9 Science Chapter 1 Matter in Our Surroundings are given below:
Physical nature of matterMatter is Made Up of ParticlesHow Small Are These Particles Of Matter?Characteristic of particles of matterParticles of Matter Have Space between ThemParticles of Matter Are Continuously MovingParticles of Matter Attract Each OtherStates of matterThe Solid StateThe Liquid StateThe Gaseous StateCan matter change its state?Effect of Change of TemperatureEffect of Change o PressureEvaporationFactors Affecting EvaporationHow Does Evaporation Cause Cooling?
Students can utilise the NCERT Solutions for Class 9 Science Chemistry Chapter 1 for any quick references to comprehend complex topics.
Matter is one of the fundamental constituents that make up everything in the universe - from minute sand particles on earth to the enigmatic black holes at the centre of many galaxies. Matter has a role to play in everything that we see around us, interacting to form new materials, some familiar and others exotic.
Explore how matter works and discover its molecular components. Also, learn how the term matter was coined and its significance in various fields of science. Find more important NCERT Solutions For Class 9 Science to aid your studies.
Exercises with Question count covered in NCERT Solutions for Class 9 Chapter 1: Matter in Our Surroundings
Exercise 1.1 & 1.2, Page number 3 - Solutions of 4 Questions
Exercise 1.3, Page number 6 - Solutions of 4 Questions
Exercise 1.4, Page number 9 - Solutions of 4 Questions
Exercise 1.5, Page number 10 - Solutions of 5 Questions
Chapter Exercise, Page number 12 - Solutions of 9 Questions
Key Features of NCERT Solutions for Class 9 Science Chapter 1 - Matter in Our Surroundings
Content elaborated in detail, ensuring all jargons are explainedSolutions have been written in an easy-to-understand languageCrafted by qualified teachers and industry expertsIncludes questions from the latest prescribed syllabusComprehensive analysis of previous year exam questionsExplore additional learning tools such as sample papers and previous year question papers
Disclaimer:
Dropped Topics - Box item titled ‘Plasma and Bose-Einstein Condensate’.
Frequently Asked Questions on NCERT Solutions for Class 9 Science Chapter 1
Explain the different characteristics of state of matter covered in the Chapter 1 of NCERT Solutions for Class 9 Science.
The different characteristics of state of matter are based on six parameters -
1. Shape
2. Volume
3. Rigidity or Fluidity
4. Intermolecular force
5. Intermolecular space
6. Compressibility
These concepts are briefly explained in the NCERT Solutions for Class 9 Science Chapter 1 curated by the experts at BYJU’S. The solutions are elaborated in a simple language to make it easier for the students while learning.
How many questions are present in each exercise of NCERT Solutions for Class 9 Science Chapter 1?
The number of questions present in each exercise of NCERT Solutions for Class 9 Science Chapter 1 are -
Exercise 1.1 & 1.2 - 4 Questions
Exercise 1.3 - 4 Questions
Exercise 1.4 - 4 Questions
Exercise 1.5 - 5 Questions
Chapter Exercise - 9 Questions
Is the NCERT Solutions for Class 9 Science Chapter 1 sufficient for the exam preparation?
The NCERT Solutions for Class 9 Science Chapter 1 are designed by the faculty at BYJU’S to help students ace the exam without fear. The fundamental concepts are explained in the most systematic way to improve the confidence among students. Each and every minute detail is covered in the NCERT Solutions to help students with their exam preparation. The solutions are available in both online and offline mode which can be used by the students based on their requirements.




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7 Comments
Jiya Ghosh JULY 23, 2020 AT 12:10 AM
I really like byjus and answer are hundred percent good 👌👌👌👌👌👌 best experience ever
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Asha OCTOBER 18, 2020 AT 7:22 PM
Thanks for this science book chapter 1 qus. And ans. Thank you very much 👏👏👏
REPLY
Shaivi MARCH 30, 2022 AT 9:55 PM
Loved it
REPLY
Shashank Kumar APRIL 12, 2022 AT 7:35 PM
My experience with byju’s is 2 good.
It’s amazing
REPLY
Fiza APRIL 13, 2022 AT 3:33 PM
It’s very helpful Thnx byjus.
REPLY
Daksh saini APRIL 24, 2022 AT 1:42 PM
Thanks for this science book chapter 1 qus. And ans. Thank you very much 👏👏👏
REPLY
rudra JUNE 7, 2022 AT 10:24 AM
It’s very helpful Thnx byjus.
REPLY
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