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NCERT exemplar Class 9 Science solutions chapter 3 deals with basic constituents of any substance or compound which is an atom. The combination of these atoms makes a molecule which in turn combines to make a substance. The NCERT exemplar Class 9 Science chapter 3 solutions are prepared by a skilled team of subject matter experts to ensure accurate and comprehensive learning of NCERT Class 9 Science. These Class 9 Science NCERT exemplar chapter 3 solutions clarify any doubts or queries as they provide a step-by-step approach to the basics of atoms and molecules. The NCERT exemplar Class 9 Science solutions chapter 3 are designed to cover all the topics of the CBSE Syllabus for Class 9 Chapter 3.
Question:1
Which of the following correctly represents 360 g of water?
(i) 2 moles of
(ii) 20 moles of water
(iii) molecules of water
(iv) molecules of water
(a) (i)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Answer: D
The average mass of one mole of is 18.02 grams.
The molecular weight of water is 18 g/mol. Hence, one mole of water weighs 18 g.
One mole of water contains water molecules.
2 moles of is and 20 moles of water is . The mass of molecules of water is 18g.
Therefore, the mass of molecules ( molecules) of water is .
Question:2
Which of the following statements is not true about an atom?
(a) Atoms are not able to exist independently
(b) Atoms are the basic units from which molecules and ions are formed
(c) Atoms are always neutral in nature
(d) Atoms aggregate in large numbers to form the matter that we can see, feel or touch
Answer: A
Atoms are not able to exist independently is not true, Atoms of most elements are not able to exist independently but inert gases can exists as atoms.
Question:3
The chemical symbol for nitrogen gas is
(a) Ni (b) (c) (d) N
Answer: B
Chemical formula of Nitrogen is N but nitrogen exist as a molecule of two atoms. Therefore, the chemical symbol of nitrogen gas is
Question:4
The chemical symbol for sodium is
(a) So (b) Sd (c) NA (d) Na
Answer: D
Sodium word is derived from Latin word Natrium hence the chemical name of sodium is Na.
Question:5
Which of the following would weigh the highest?
(a) 0.2 mole of sucrose
(b) 2 moles of
(c) 2 moles of
(d) 10 moles of
Answer: C
From mole concept,
1 mole = molecular weight in gram.
Weight of a sample in gram = Number of moles × Molar mass
Mass of 1 mole of sucrose
Mass of 1 mole of
Mass of 1 mole of
Mass of 1 mole of
(a) 0.2 moles of
(b) 2 moles of is
(c) 2 moles of
(d) 10 moles of
Question:6
Which of the following has maximum number of atoms?
(a) 18g of
(b) 18g of
(c) 18g of
(d) 18g of
Answer: D
(a) 18 g of water
(b) 18 g of oxygen =
(c) 18 g of
(d) 18 g of
Question:7
Which of the following contains maximum number of molecules?
(a) 1g
(b) 1g
(c) 1g
(d) 1g
Answer: C
Molar mass of other molecules are much higher than given mass, so number of molecules in them will be less than that in hydrogen.
1 g of
Question:8
Mass of one atom of oxygen is
(a)
(b)
(c)
(d) 8u
Answer:
Mass of one atom of oxygen
Question:9
3.42 g of sucrose are dissolved in 18g of water in a beaker. The number of oxygen atoms in the solution are
(a)
(b)
(c)
(d)
Answer: A
1 mol of sucrose contains atoms of oxygen,
Here,
mol of sucrose contains atoms of oxygen
atoms of oxygen
gmol-1
= 1mol
1mol of water contains atom of oxygen
Total number of oxygen atoms = Number of oxygen atoms from sucrose + Number of oxygen atoms from water
Number of oxygen atoms in solution
Avogadro’s number
Question:10
A change in the physical state can be brought about
(a) only when energy is given to the system
(b) only when energy is taken out from the system
(c) when energy is either given to, or taken out from the system
(d) without any energy change
Answer: C
A change in the physical state can be brought about when energy is either given to, or taken out from the system. When a solid change into liquid, it absorbs energy. It is because, energy change helps in changing the magnitude of attraction forces between the particles, thus helps in changing the physical states (i.e., solid, liquid, gas) of matter. When a liquid change into solid, it releases energy.
Question:11
Which of the following represents a correct chemical formula? Name it.
(a) CaCl
(b)
(c)
(d) NaS
Answer: B
The correct formula is CaCl2 (valency of Ca = 2, valency of Cl = 1).
The correct formula is (valency of Na = 1, Valency of ).
The correct formula is (valency of Na = 1, valency of sulphide = 2).
, is the correct formula, its name is bismuth phosphate. Bismuth phosphate is right because both ions are trivalent.
Question:12
Write the molecular formulae for the following compounds
(a) Copper (II) bromide
(b) Aluminium (III) nitrate
(c) Calcium (II) phosphate
(d) Iron (III) sulphide
(e) Mercury (II) chloride
(f) Magnesium (II) acetate
Solution:
(a) Copper(II) Bromide –
(b) Aluminium(III) nitrate –
(c) Calcium (II) phosphate –
(d) Iron(III) sulphide –
(e) Mercury(II) chloride –
(f) Magnesium(II) acetate –
Question:14
Write the cations and anions present (if any) in the following compounds
(a)
(b)
(c)
(d)
Solution.
Anions Cations
(a)
(b)
(c) It is a covalent compound
(d)
Question:15
Give the formulae of the compounds formed from the following sets of elements
(a) Calcium and fluorine
(b) Hydrogen and Sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
(f) Carbon and oxygen
Answer:
(a) Calcium and fluoride - Calcium Fluoride
(b) Hydrogen and sulphur - Hydrogen Sulphide
(c) Nitrogen and hydrogen - Ammonia
(d) Carbon and chlorine - Carbon Tetrachloride
(e) Sodium and oxygen - Sodium Oxide
(f) Carbon and oxygen - Carbon dioxide ; Carbon Monoxide (CO)
Question:16
Which of the following symbols of elements are incorrect? Give their correct symbols
(a) Cobalt CO
(b) Carbon c
(c) Aluminum AL
(d) Helium He
(e) Sodium So
Answer:
(a) Incorrect, the correct symbol of cobalt is Co
(b) Incorrect, the correct symbol of carbon is C
(c) Incorrect, the correct symbol of aluminum is Al
(d) Correct (He)
(e) Incorrect, the correct symbol of sodium is Na
Question:18
State the number of atoms present in each of the following chemical species
(a)
(b)
(c)
(d)
Solution.
(a)
(b)
(c)
(d) CO = 1C + 1(O) = 2
Question:19
What is the fraction of the mass of water due to neutrons?
Solution.
In water molecule , number of neutrons = [(number of neutrons in H) (number of neutrons in O)](as number of
neutrons in H = 0)
Mass of 8 neutrons (mass of one neutron = 1.008934)
Molar mass of water
There are 8 neutrons in one atom of oxygen
Mass of 8 neutrons
Fraction of mass of water due to neutrons =
Question:20
Does the solubility of a substance change with temperature? Explain with the help of an example.
Solution.
Yes, the solubility of a substance depends on its temperature. The solubility of solids in liquids usually increases on increasing the temperature and decreases on decreasing the temperature. The solubility of gases in liquids usually decreases on increasing the temperature and increases on decreasing the temperature.
For example, one can dissolve more sugar in hot water than in cold water.
Question:21
Classify each of the following on the basis of their atomicity.
(a)
(b)
(c)
(d)
(e)
(f)
(g)
(h)
(i) HCl
(j)
(k) He
(l) Ag
Answer:
(a) Diatomic (2 atoms)
(b) Triatomic (3 atoms)
(c) Triatomic (3 atoms)
(d) Polyatomic (8 atoms)
(e) Polyatomic (4 atoms)
(f) Polyatomic (4 atoms)
(g) Polyatomic (14 atoms)
(h) Triatomic (3 atoms)
(i) Diatomic (2 atoms)
(j) Polyatomic (5 atoms)
(k) Monoatomic (1 atom)
(l) Monoatomic (1 atom)
Question:22
Answer.
There are many ways by which we can differentiate between sugar and salt without testing. We can identify the powder by heating. The powder will char if it is a sugar. Dissolve salt and sugar separately in alcohol, sugar will be dissolved in it while salt will not be dissolved. the powder can be dissolved in water and checked for electrical conductivity. If it conducts, then the powder is salt.
Question:23
Calculate the number of moles of magnesium present in a magnesium ribbon weighing 12 g. Molar atomic mass of
magnesium is .
Answer:
Weight of a sample in grant = Number of moles × Molar mass
Atomic mass of Mg
24 g of Mg = 1 mol
12 g of Mg = 12/24 = 0.5 mol
Question:24
Verify by calculating that
(a) 5 moles of and 5 moles of do not have the same mass.
(b) 240 g of calcium and 240 g magnesium elements have a mole ratio of .
Answer:
(a) has molar mass
5 moles of have molar mass
has molar mass
5 moles of have mass
Hence, they do not have same mass.
(b) Number of moles in 240g Ca metal
Number of moles in 240g of Mg metal
Ratio
Question:25
Find the ratio by mass of the combining elements in the following compounds. (You may use Appendix-III)
(a) (d)
(b) (e)
(c) (f)
Answer:
(a)
(b)
(c)
(d)
(e)
(f)
Question:26
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
Calculate the number of ions obtained from when 222 g of it is dissolved in water.
Answer:
Total number of ions by 2 moles of
Number of ions = Number of moles of ions
ions
Question:27
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron.
Answer:
Number of electrons in Na atom = 11
Number of electrons in
For 1 mole of Na atom and Na+ the difference in electrons = 1 mole
For 100 moles of Na atoms and Na+ ions the difference = 100 moles of electrons
Mass of 100 moles of electrons = 5.48002 g
Mass of 1 mole of electrons
Mass of one electron
Question:28
Answer:
Molar mass of HgS
Mass of Hg in 232.6g of HgS =200.6g
Mass of Hg in 225g of HgS
Question:29
One way of srews weigh
Mass of earth is times the mass of screws. The earth is 2400 times heavier than one mole of screws
Question:30
1 mole of oxygen atoms
∴ Number of moles of oxygen atoms
Question:31
Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. (a) Whose container is heavier? (b) Whose container has more number of atoms?
Solution.
(a) Mass of sodium atoms carried by Krish
While mass of carbon atom carried by Raunak
Thus, Krish’s container is heavy.
(b) As the two bags have the same number of moles of atoms, both the bags will have the same number of atoms.
Question:32
Question:33
The visible universe is estimated to contain stars. How many moles of stars are present in the visible universe?
Answer:
1 mole of stars equals
Number of moles of stars
Number of moles of stars = 0.0166
Question:34
What is the SI prefix for each of the following multiples and submultiples of a unit?
(a) (b) (c) (d)
(e) (f)
Answer:
(a) kilo
(b) deci
(c) centri
(d) micro
(e) nano
(f) pico
Question:36
Compute the difference in masses of moles each of magnesium atoms and magnesium ions.
Answer:
ion and Mg atom differ by two electrons.
moles of and Mg atoms would differ by moles of electrons.
Mass of moles of electrons.
Question:38
Compute the number of ions present in 5.85 g of sodium chloride.
Answer:
of
Or, 0.1 moles of NaCl particles.
Each NaCl particle is equivalent to one one i.e. 2 ions.
Total moles of ions
No. of ions
Question:39
Answer:
One gram of gold sample will contain of gold
Number of moles of gold
One mole of gold contains atoms
of gold will contain
Question:40
What are ionic and molecular compounds? Give examples.
Answer:
While forming some compounds, atoms may gain or lose electrons, thereby forming electrically charged particles called ions. Compounds that are formed by the attraction of cations and anions are known as ionic compounds.
Ex : (sodium chloride- common salt.)
Compounds formed by the bonding of uncharged species are known as molecular compounds. The bonding is called covalent bonding. Molecular compounds are formed by sharing of electrons between the two atoms. Ex: (Carbon monoxide)
Question:41
Ionization of Al atom occurs as
Therefore, ion is formed from Al atom by loss of 3 electrons. Difference in mass of 1 mole of Al atoms and 1 mole of ions
mole of Al atoms is heavier than 1 mole of ions.
It is because 1 mole of Al atom have electrons and mole of Al ion have
electrons
Question:42
A silver ornament of mass’m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament.
Answer:
Mass of silver =mg
Mass of gold deposited
No. of atoms of silver
No. of atoms of gold
Ratio of the number of atoms of gold to silver
Question:43
Therefore, number of molecules of
Question:44
(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called Law of conservation of mass.
It states that mass is neither created nor destroyed in chemical reactions.
(b) A group of atoms carrying a fixed charge on them is called ions.
An ion is a charged atom or molecule. It is charged because the number of electrons are not equal to the number of protons in the atom or molecule.
(c) The formula unit mass of is .
(d) Formula of sodium carbonate is and that of ammonium sulphate is
Question:46
(a) In this crossword puzzle (Fig 3.2), names of 11 elements are hidden. Symbols of these are given below. Complete the puzzle.
1. Cl 7. He
2. H 8. F
3. Ar 9. Kr
4. O 10. Rn
5. Xe 11. Ne
6. N
(b) Identify the total number of inert gases, their names and symbols from this cross word puzzle.
Answer:
(a)
(b) Six inert gases:
Helium (He); Neon ( Ne); Argon (Ar); Krypton (Kr); Xenon (Xe); Radon (Rn).
Question:48
The chemical reaction involved is :
To produce 18g of glucose, mass of water consumed =
To produce 18g of glucose, mass of water consumed
NCERT exemplar Class 9 Science solutions chapter 3 includes the following topics :
Chapter wise solutions |
These Class 9 Science NCERT exemplar chapter 3 solutions provide a basic understanding of atoms and molecules. This chapter discusses different chemical formulas for different type of compounds and enables a student to judge if the chemical formula given is correct or not. Atoms and Molecules can be practiced by the students of Class 9 through these NCERT exemplar Class 9 Science solutions chapter 3 and can be leveraged to solve other reference books such as NCERT Class 9 Science TextBook, Lakhmir Singh and Manjit Kaur by S. Chand et cetera.
NCERT exemplar Class 9 Science solutions chapter 3 pdf download enables the students to download/view these solutions in an offline environment while studying NCERT exemplar Class 9 Science chapter 3.
Chapter No. | Chapter Name |
Chapter 1 | Matter in Our Surroundings |
Chapter 2 | Is Matter Around Us Pure |
Chapter 3 | Atoms and Molecules |
Chapter 4 | Structure of The Atom |
Chapter 5 | The Fundamental Unit of Life |
Chapter 6 | Tissues |
Chapter 7 | Diversity in Living Organisms |
Chapter 8 | Motion |
Chapter 9 | Force and Laws of Motion |
Chapter 10 | Gravitation |
Chapter 11 | Work and Energy |
Chapter 12 | Sound |
Chapter 13 | Why Do We Fall ill? |
Chapter 14 | Natural Resources |
Chapter 15 | Improvement in Food Resources |
A1. Avogadro number tells us a number of molecules or atoms in one mole of substance
Its value is 6.023×1023. For example, molecular weight of water is 18 therefore one mole of water will have 18 g and it will have number of water molecules equal to Avogadro number.
A2. No, oxygen does not exist in the atomic form in nature. Oxygen exists either in the form of a diatomic molecule or triatomic molecules. They are called oxygen gas and ozone respectively.
A3. The molecular weight of oxygen is 32 therefore 2 g of oxygen will have 1 /16 moles.
The molecular weight of helium is four therefore 2 g of helium will have 1 /2 moles.
Hence, in the mixture, the ratio of oxygen and helium will be 1:8.
A4. The atomic weight of any atom does not change when it gets ionised. In ionisation, only electrons are transferred which have negligible weight. Thus, they do not affect the atomic weight of the atom.
A4. Generally, the CBSE pattern suggests that the final paper for Class 9 should consist of a mixture of objective type (1 question) and short answer type(2 questions). A student going with the NCERT exemplar Class 9 Science solutions chapter 3 thoroughly can easily score well in the final paper
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Radio Jockey is an exciting, promising career and a great challenge for music lovers. If you are really interested in a career as radio jockey, then it is very important for an RJ to have an automatic, fun, and friendly personality. If you want to get a job done in this field, a strong command of the language and a good voice are always good things. Apart from this, in order to be a good radio jockey, you will also listen to good radio jockeys so that you can understand their style and later make your own by practicing.
A career as radio jockey has a lot to offer to deserving candidates. If you want to know more about a career as radio jockey, and how to become a radio jockey then continue reading the article.
The word “choreography" actually comes from Greek words that mean “dance writing." Individuals who opt for a career as a choreographer create and direct original dances, in addition to developing interpretations of existing dances. A Choreographer dances and utilises his or her creativity in other aspects of dance performance. For example, he or she may work with the music director to select music or collaborate with other famous choreographers to enhance such performance elements as lighting, costume and set design.
A career as social media manager involves implementing the company’s or brand’s marketing plan across all social media channels. Social media managers help in building or improving a brand’s or a company’s website traffic, build brand awareness, create and implement marketing and brand strategy. Social media managers are key to important social communication as well.
Photography is considered both a science and an art, an artistic means of expression in which the camera replaces the pen. In a career as a photographer, an individual is hired to capture the moments of public and private events, such as press conferences or weddings, or may also work inside a studio, where people go to get their picture clicked. Photography is divided into many streams each generating numerous career opportunities in photography. With the boom in advertising, media, and the fashion industry, photography has emerged as a lucrative and thrilling career option for many Indian youths.
An individual who is pursuing a career as a producer is responsible for managing the business aspects of production. They are involved in each aspect of production from its inception to deception. Famous movie producers review the script, recommend changes and visualise the story.
They are responsible for overseeing the finance involved in the project and distributing the film for broadcasting on various platforms. A career as a producer is quite fulfilling as well as exhaustive in terms of playing different roles in order for a production to be successful. Famous movie producers are responsible for hiring creative and technical personnel on contract basis.
In a career as a copywriter, one has to consult with the client and understand the brief well. A career as a copywriter has a lot to offer to deserving candidates. Several new mediums of advertising are opening therefore making it a lucrative career choice. Students can pursue various copywriter courses such as Journalism, Advertising, Marketing Management. Here, we have discussed how to become a freelance copywriter, copywriter career path, how to become a copywriter in India, and copywriting career outlook.
In a career as a vlogger, one generally works for himself or herself. However, once an individual has gained viewership there are several brands and companies that approach them for paid collaboration. It is one of those fields where an individual can earn well while following his or her passion.
Ever since internet costs got reduced the viewership for these types of content has increased on a large scale. Therefore, a career as a vlogger has a lot to offer. If you want to know more about the Vlogger eligibility, roles and responsibilities then continue reading the article.
For publishing books, newspapers, magazines and digital material, editorial and commercial strategies are set by publishers. Individuals in publishing career paths make choices about the markets their businesses will reach and the type of content that their audience will be served. Individuals in book publisher careers collaborate with editorial staff, designers, authors, and freelance contributors who develop and manage the creation of content.
Careers in journalism are filled with excitement as well as responsibilities. One cannot afford to miss out on the details. As it is the small details that provide insights into a story. Depending on those insights a journalist goes about writing a news article. A journalism career can be stressful at times but if you are someone who is passionate about it then it is the right choice for you. If you want to know more about the media field and journalist career then continue reading this article.
Individuals in the editor career path is an unsung hero of the news industry who polishes the language of the news stories provided by stringers, reporters, copywriters and content writers and also news agencies. Individuals who opt for a career as an editor make it more persuasive, concise and clear for readers. In this article, we will discuss the details of the editor's career path such as how to become an editor in India, editor salary in India and editor skills and qualities.
Individuals who opt for a career as a reporter may often be at work on national holidays and festivities. He or she pitches various story ideas and covers news stories in risky situations. Students can pursue a BMC (Bachelor of Mass Communication), B.M.M. (Bachelor of Mass Media), or MAJMC (MA in Journalism and Mass Communication) to become a reporter. While we sit at home reporters travel to locations to collect information that carries a news value.
Are you searching for a Corporate Executive job description? A Corporate Executive role comes with administrative duties. He or she provides support to the leadership of the organisation. A Corporate Executive fulfils the business purpose and ensures its financial stability. In this article, we are going to discuss how to become corporate executive.
A multimedia specialist is a media professional who creates, audio, videos, graphic image files, computer animations for multimedia applications. He or she is responsible for planning, producing, and maintaining websites and applications.
Welding Engineer Job Description: A Welding Engineer work involves managing welding projects and supervising welding teams. He or she is responsible for reviewing welding procedures, processes and documentation. A career as Welding Engineer involves conducting failure analyses and causes on welding issues.
A quality controller plays a crucial role in an organisation. He or she is responsible for performing quality checks on manufactured products. He or she identifies the defects in a product and rejects the product.
A quality controller records detailed information about products with defects and sends it to the supervisor or plant manager to take necessary actions to improve the production process.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
A QA Lead is in charge of the QA Team. The role of QA Lead comes with the responsibility of assessing services and products in order to determine that he or she meets the quality standards. He or she develops, implements and manages test plans.
A Structural Engineer designs buildings, bridges, and other related structures. He or she analyzes the structures and makes sure the structures are strong enough to be used by the people. A career as a Structural Engineer requires working in the construction process. It comes under the civil engineering discipline. A Structure Engineer creates structural models with the help of computer-aided design software.
The Process Development Engineers design, implement, manufacture, mine, and other production systems using technical knowledge and expertise in the industry. They use computer modeling software to test technologies and machinery. An individual who is opting career as Process Development Engineer is responsible for developing cost-effective and efficient processes. They also monitor the production process and ensure it functions smoothly and efficiently.
An AWS Solution Architect is someone who specializes in developing and implementing cloud computing systems. He or she has a good understanding of the various aspects of cloud computing and can confidently deploy and manage their systems. He or she troubleshoots the issues and evaluates the risk from the third party.
An Azure Administrator is a professional responsible for implementing, monitoring, and maintaining Azure Solutions. He or she manages cloud infrastructure service instances and various cloud servers as well as sets up public and private cloud systems.
Careers in computer programming primarily refer to the systematic act of writing code and moreover include wider computer science areas. The word 'programmer' or 'coder' has entered into practice with the growing number of newly self-taught tech enthusiasts. Computer programming careers involve the use of designs created by software developers and engineers and transforming them into commands that can be implemented by computers. These commands result in regular usage of social media sites, word-processing applications and browsers.
A Product Manager is a professional responsible for product planning and marketing. He or she manages the product throughout the Product Life Cycle, gathering and prioritising the product. A product manager job description includes defining the product vision and working closely with team members of other departments to deliver winning products.
Individuals in the information security manager career path involves in overseeing and controlling all aspects of computer security. The IT security manager job description includes planning and carrying out security measures to protect the business data and information from corruption, theft, unauthorised access, and deliberate attack
An Automation Test Engineer job involves executing automated test scripts. He or she identifies the project’s problems and troubleshoots them. The role involves documenting the defect using management tools. He or she works with the application team in order to resolve any issues arising during the testing process.
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