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Section 5.2 Review The Structure of the Atom Multiple Choice For each question below, select the letter of the best answer. 1. Which of the following statements about protons, neutrons, <strong>and</strong> electrons is true? (a) Protons <strong>and</strong> electrons have about the same mass. (b) Neutrons <strong>and</strong> electrons have equal but opposite charges. (c) The mass of a proton is nearly 2000 times greater than the mass of an electron. (d) The mass of an proton is nearly 2000 times greater than the mass of a neutron. (e) Neutrons <strong>and</strong> electrons are found in the nucleus of an atom. 2. What is the atomic number of mercury, Hg? (a) 2+ (b) 80 (c) 120 (d) 200 (e) 200.6 3. What is the mass number of an atom of chlorine with 18 neutrons? (a) 1– (b) 17 (c) 18 (d) 35 (e) 35.5 4. What element is represented by the Bohr- Rutherford diagram below? (a) potassium, K (b) calcium, Ca (c) hydrogen, H (d) argon, Ar 19 p + (e) yttrium, Y 20 n 0 5. Which of the following statements about the masses of atoms is false? (a) Most of the mass of an atom is located in the nucleus. (b) Electrons contribute very little to the mass of an atom. (c) Atoms of different elements have different masses. (d) Most of the mass of an atom’s nucleus is due to the mass of neutrons. (e) The mass number of an atom is equal to the number of protons plus the number of neutrons. 6. A neutral atom has eight electrons <strong>and</strong> eight neutrons. Which of the following options correctly represents the atom? (a) carbon-16 (b) oxygen-16 (c) oxygen-24 (d) oxygen-8 (e) sulfur-8 7. Which of the following symbols represents the element with an atomic number of 14? (a) C (b) N (c) Ni (d) Si (e) S 8. Which of the following statements is false? (a) The number of neutrons an atom has defines what element it is. (b) The number of electrons an atom has defines what element it is. (c) The number of protons an atom has defines what element it is. (d) All of the above are true. (e) None of the above are true. Grade 9 Academic Student <strong>Exercise</strong> <strong>and</strong> <strong>Homework</strong> <strong>Book</strong> DRAFT 4 MHR • Unit 2 Atoms, Elements <strong>and</strong> Compounds DRAFT

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Written to the Ontario curriculum, Grades 9 and 10, Science, Academic (SNC1D and SNC2D). - The Student Edition supports the learning process and ensures understanding - The text features Learning Checks, Literacy Test Prep questions, Literacy Strategies, Section Reviews, Chapter Reviews and Unit Reviews - The consumable workbook is organized by section with additional questions and Literacy Test preparation Key Features: - The comprehensive Teachers Resource offers teaching suggestions, technology support and assessment and evaluation strategies for each chapter

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ISBN:                9780070318519

Publisher:      McGraw

Subject:            Science

Grade:              9

Edition:            1st

Pagecount:     188

Cover:               Softcover

Copyright:      2009

Type:                  Workbook

Science, Grade 9, Academic

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Ncert solutions for class 9 science updated for 2023-24 free chapterwise pdf download.

NCERT Solutions for Class 9 Science help students to clear any doubts instantly and efficiently. These NCERT Solutions guide students to learn the important concepts which are included in the CBSE Class 9 Science syllabus. Students are required to solve the exercise questions included in the textbook to create a proper understanding of the topics.

While solving the textbook questions, doubts arise among students. The NCERT Solutions for Class 9 come in handy at such times, as they include precise explanations and detailed answers to those questions. These CBSE Science NCERT Solutions for Class 9 cover solutions to all the important chapters included in the textbook, like Matter, Atoms, Tissues, Living Organisms, Motion, Force, Laws of Motion, Gravitation, Energy and Work, Sound, Natural Resources, etc.

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BYJUS Classes 9

NCERT Solutions of Class 9 Science Book Chapter Brief

Chapter 1: matter in our surrounding.

The Class 9 science textbook starts with the chapter “Matter in Our Surroundings”. Everything that we see around us is made up of material which is called matter. These things occupy space and have mass. Earlier, Indian philosophers had classified matter into 5 basic elements called Panch Tatva – air, water, earth, sky and fire. Now, modern scientists have come up with 2 types of classification, i.e., based on physical property and chemical nature. In this chapter, students will learn about the physical properties of matter .

The matter is made up of particles and these particulars are very small. The particles of matter have space between them, they are continuously moving and attract each other. The matter around us exists in 3 different states – solids, liquids and gases. These states of matter arise due to variation in the characteristic of the particles of matter. All the 3 states of matters have been explained in-depth with the help of activities. Further, the textbook explains that the state of matter is inter-convertible. The state of matter can be changed by changing temperature or pressure. The phenomenon of change of a liquid into vapour at any temperature below its boiling point is called evaporation. The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity and the wind speed. Evaporation also causes cooling.

Topics Covered in Class 9 Science Chapter 1 Matter in Our Surrounding :

Definition of matter; solid, liquid and gas; characteristics – shape, volume, density; change of state –  melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Also access the following resources for Class 9 Chapter 1 Matter in Our Surrounding at BYJU’S:

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  • NCERT Exemplar Class 9 Science Solutions for Chapter 1 – Matter in Our Surroundings

Chapter 2: Is Matter Around Us Pure?

This chapter of NCERT Class 9 Science students will teach about mixtures, solutions, properties of solutions, separation of mixtures, and physical and chemical changes. Along with this, they will also learn about compounds and their properties, the difference between mixtures and compounds, the classification of matter, etc.

Topics Covered in Class 9 Science Chapter 2 Is Matter Around Us Pure?  :

Nature of matter: Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions. Physical and chemical changes (excluding separating the components of a mixture).

Also, access the following resources for Class 9 Chapter 2 Is Matter Around Us Pure? at BYJU’S:

  • CBSE Class 9 Science Chapter 2 Is Matter Around Us Pure? Notes
  • Important Questions for CBSE Class 9 Science Chapter 2 – Is Matter Around Us Pure?
  • NCERT Exemplar Class 9 Science Solutions for Chapter 2 – Is Matter Around Us Pure?

Chapter 3: Atoms and Molecules

In NCERT Class 9 Science Chapter 3, students will learn the laws of chemical combination , atoms and molecules. They will get to know how to write a chemical formula, molecular mass and mole concepts and some numerical problems related to these concepts.

Topics Covered in Class 9 Science Chapter 3 Atoms and Molecules  :

Particle nature and their basic units: Atoms and molecules, Law of Chemical Combination, Chemical formula of common compounds, Atomic and molecular masses.

Also, access the following resources for Class 9 Chapter 3 Atoms and Molecules, at BYJU’S:

  • Atoms And Molecules Class 9 Notes – Chapter 3
  • Important Questions for Class 9 Science Chapter 3 – Atoms and Molecules
  • NCERT Exemplar Class 9 Science Solutions for Chapter 3 – Atoms And Molecules

Chapter 4: Structure of the Atom

This chapter of NCERT Class 9 Science deals with the various atomic models of atoms that were proposed by different scientists. In addition to it, this chapter also covers electrons’ distribution in different orbits, calculation of valency , atomic number and mass number.

Topics Covered in Class 9 Science Chapter 4 Structure of the Atom  :

Structure of atoms: Electrons, protons and neutrons, Valency, Atomic Number and Mass Number, Isotopes and Isobars.

Also, access the following resources for Class 9 Chapter 4 Structure of the Atom at BYJU’S:

  • Structure of the Atom Class 9 CBSE Notes – Chapter 4
  • Important Questions of CBSE Class 9 Science Chapter 4 – Structure of the Atom
  • NCERT Exemplar Class 9 Science Solutions for Chapter 4 – Structure of the Atom

Chapter 5: The Fundamental Unit of Life

This chapter is related to Biology. In this chapter, students will get to know that the cell is the fundamental unit of life. The whole chapter revolves around the cell and its structural organisation, in which students will learn about the plasma membrane , cell wall, nucleus, cytoplasm and structure of an animal cell.

Topics Covered in Class 9 Science Chapter 5 The Fundamental Unit of Life  :

Cell – Basic Unit of life: Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number.

Also, access the following resources for Class 9 Chapter 5 The Fundamental Unit of Life at BYJU’S:

  • The Fundamental Unit of Life Class 9 CBSE Notes – Chapter 5
  • Revision Notes For Class 9 Science Chapter 5 The Fundamental Unit of Life
  • NCERT Exemplar Class 9 Science Solutions for Chapter 5 – The Fundamental Unit of Life

Chapter 6: Tissues

This chapter pertains to the basic definition of tissue and then elaborates on Plant and Animal tissue with proper diagrams. Students will get to know the different types of plant and animal tissues with a detailed explanation of each.

Topics Covered in Class 9 Science Chapter 6 Tissues  :

Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Also, access the following resources for Class 9 Chapter 6 Tissues at BYJU’S:

  • Tissues Class 9 CBSE Notes – Chapter 6
  • Revision Notes For Class 9 Science Chapter 6 Tissues
  • NCERT Exemplar Class 9 Science Solutions for Chapter 6 – Tissues

Chapter 7: Diversity in Living Organism

This chapter deals with the classification of plants and animals. Students get to know that all living organisms are divided into 5 kingdoms namely Monera, Protista, Fungi, Plantae and Animalia. It also describes the classification and evolution, the hierarchy of classification.

Also access the following resources for Class 9 Chapter 7 Diversity in Living Organism at BYJU’S:

  • Diversity in Living Organisms Class 9 CBSE Notes – Chapter 7
  • Important Questions for CBSE Class 9 Science Chapter 7 – Diversity in Living Organisms
  • NCERT Exemplar Class 9 Science Solutions for Chapter 7 – Diversity In Living Organisms

Chapter 8: Motion

NCERT Class 9 Science Chapter 8 describes motion, the speed with direction, rate of change of velocity , and graphical representation of motion. Also, students will find the 3 equations of motion and numerical problems related to them. Overall, this chapter will be a mix of theory as well as the numerical part.

Topics Covered in Class 9 Science Chapter 8 Motion :

Motion: Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, elementary idea of uniform circular motion.

Also, access the following resources for Class 9 Chapter 8 Motion at BYJU’S:

  • CBSE Class 9 Physics Motion Notes
  • NCERT Exemplar Class 9 Science Solutions for Chapter 8 – Motion

Chapter 9: Force and Law of Motion

This chapter explains the 3 laws of motion with the help of diagrams and examples. Below are the 3 laws of motion:

  • First law of motion: An object continues to be in a state of rest or of uniform motion along a straight line unless acted upon by an unbalanced force.
  • Second law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the force .
  • Third law of motion: To every action, there is an equal and opposite reaction, and they act on two different bodies.

Topics Covered in Class 9 Science Chapter 9 Force and Law of Motion  :

Force and Newton’s laws: Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration.

Also, access the following resources for Class 9 Chapter 9 Force and Law of Motion at BYJU’S:

  • Force and Laws Of Motion Class 9 CBSE Notes – Chapter 9
  • Revision Notes For Class 9 Science Chapter 9 Force and Laws of Motion
  • NCERT Exemplar Class 9 Science Solutions for Chapter 9 – Force and Laws Of Motion

Chapter 10: Gravitation

In chapter 10 of NCERT Class 9 Science, students will learn the universal law of gravitation and its importance, free fall, mass, weight, thrust and pressure, Archimedes’ principle and relative density. Students will also find numerical problems related to these topics.

Topics Covered in Class 9 Science Chapter 10 Gravitation :

Gravitation: Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall.

Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy.

Also, access the following resources for Class 9 Chapter 10 Gravitation at BYJU’S:

  • Gravitation Class 9 CBSE Notes – Chapter 10
  • Revision Notes For Class 9 Science Chapter 10 Gravitation
  • NCERT Exemplar Class 9 Science Solutions for Chapter 10 – Gravitation

Chapter 11: Work and Energy

In this chapter, the concept of work is defined with different activities, numerical and examples. The chapter also deals with energy and its different forms. Examples are given to explain all types of energy. The chapter ends with the topic “rate of doing work”.

Topics Covered in Class 9 Science Chapter 11 Work and Energy  :

Work, Energy and Power: Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy (excluding commercial unit of Energy).

Also, access the following resources for Class 9 Chapter 11 Work and Energy at BYJU’S:

  • Work And Energy Class 9 CBSE Notes – Chapter 11
  • Revision Notes For Class 9 Science Chapter 11 Work and Energy
  • NCERT Exemplar Class 9 Science Solutions for Chapter 11 – Work And Energy

Chapter 12: Sound

Chapter 12 of CBSE Class 9 Science, deals with concepts such as the production of sound, propagation of sound, the reflection of sound, range of hearing, applications of ultrasound, and the structure of the human ear . A few numericals are also there in the chapter which can only be solved after understanding the concepts. So, students must grasp and study the chapter carefully.

Topics Covered in Class 9 Science Chapter 12 Sound :

Sound: Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Also access the following resources for Class 9 Chapter 12 Sound at BYJU’S:

  • CBSE Class 9 Science Chapter 12 Sound Notes
  • Important Questions for CBSE Class 9 Science Chapter 12 – Sound
  • NCERT Exemplar Class 9 Science Solutions for Chapter 12 – Sound

Chapter 13: Why Do We Fall Ill?

NCERT Class 9 Science chapter 13 deals with health issues and different types of diseases. It covers topics like; Health and its failure , disease and its cause, infectious diseases. This chapter is added to make students aware of different types of diseases so that they take care of their health and be fit and healthy.

Also access the following resources for Class 9 Chapter 13 Why Do We Fall Ill? at BYJU’S:

  • Why Do We Fall Ill? Class 9 CBSE Notes – Chapter 13
  • Important Questions for CBSE Class 9 Science Chapter 13 – Why Do We Fall Ill?
  • NCERT Exemplar Class 9 Science Solutions for Chapter 13 – Why Do We Fall Ill?

Chapter 14: Natural Resources

We are blessed with natural resources. These are essential to meet the basic requirements of all forms of life on Earth. So, this chapter has been included by NCERT to provide knowledge on the types of resources available on the Earth. This chapter deals with the topics like air, water, soil, the biogeochemical cycle and the ozone layer, its importance and how humans are polluting them.

Also access the following resources for Class 9 Chapter 14 Natural Resources at BYJU’S:

  • Natural Resources Class 9 CBSE Notes – Chapter 14
  • Revision Notes For Class 9 Science Chapter 14 Natural Resources
  • NCERT Exemplar Class 9 Science Solutions for Chapter 14 – Natural Resources

Chapter 15: Improvement in Food Resources

The last chapter of NCERT Class 9 Science covers topics like Improvement in crop yields, manure, fertilizer, storage of grains, and animal husbandry . This chapter provides knowledge regarding agriculture, farming and dairy.

Also access the following resources for Class 9 Chapter 15 Improvement in Food Resources at BYJU’S:

  • Improvement in Food Resources Class 9 CBSE Notes – Chapter 15
  • Important Questions for CBSE Class 9 Science Chapter 15 – Improvement in Food Resources
  • Revision Notes For Class 9 Science Chapter 15 Improvement in Food Resources
  • NCERT Exemplar Class 9 Science Solutions for Chapter 15 – Improvement In Food Resources

To download the complete book in PDF format, visit NCERT Science Book Class 9 . For more practice tests and mock tests, sign up on BYJU’S the learning app. Apart from Science, get NCERT Solutions for all the subjects. Students can download worksheets, assignments, NCERT Books , notes and study materials for exam preparation and for a better understanding of the topics.

CBSE Class 9 Science Evaluation Scheme (Theory) –

I Matter-Its Nature and Behaviour 25
II Organization in the Living World 22
III Motion, Force and Work 27
IV Food; Food Production 06
80
20
100

Features of NCERT 9 th Class Science Book Solutions

The book has a wide variety of features which are listed below:

  • CBSE Class 9 Science NCERT Solutions are available to everyone for free.
  • Covers all the exercise problems from the Class 9 textbook.
  • Consists of extra questions, exemplar problems, the important questions from previous year question papers and sample papers, worksheets, MCQs, short answering questions, descriptive type questions, their solutions and tips and tricks.
  • CBSE Class 9 Science Solutions files are available for download in PDF format for easy access.
  • Diagrams are included to help students visualize the topics.
  • Most effective solutions are given which can help to score well in the exams.

Frequently Asked Questions on NCERT Solutions for Class 9 Science

How many chapters are there in the ncert solutions for class 9 science , can i expect the questions from ncert solutions for class 9 science to be asked in the annual exam, is the ncert solutions for class 9 science sufficient for the exam preparation, why should students refer to the ncert solutions for class 9 science .

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