{"id":821880,"date":"2024-04-17T14:47:53","date_gmt":"2024-04-17T09:17:53","guid":{"rendered":"https:\/\/leverageedu.com\/discover\/?p=821880"},"modified":"2024-04-17T14:47:53","modified_gmt":"2024-04-17T09:17:53","slug":"ncert-solutions-class-9-science-chapter-3","status":"publish","type":"post","link":"https:\/\/leverageedu.com\/discover\/school-education\/ncert-solutions-class-9-science-chapter-3\/","title":{"rendered":"NCERT Solutions Class 9 Science Chapter 3 &#8216;Atoms and Molecules&#8217; (Free PDF)\u00a0"},"content":{"rendered":"\n<p>We are providing NCERT Solutions Class 9 Science Chapter 3 &#8216;Atoms and Molecules&#8217; to help you navigate through your school exams. You can also download a PDF for important questions and answers for quick revision. Let us get started!&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-light-green-cyan-background-color has-text-color has-background has-link-color has-medium-font-size wp-elements-5b45d9c5013123912e5cefd3d833b95b\"><a href=\"https:\/\/drive.google.com\/file\/d\/1Kb5eL-5eSk-8DVEHSdxF4NL8_L9y-ewA\/view?usp=sharing\"><strong>Download the NCERT Solutions of Class 9 Science Chapter 3 PDF Here!<\/strong>&nbsp;<\/a><\/p>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-link-color has-medium-font-size wp-elements-05206ece9cd525eff372b47e63815144\"><strong>Download Solutions of all the Chapters of Class 9 Science<\/strong>:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-very-light-gray-to-cyan-bluish-gray-gradient-background has-background\"><tbody><tr><td><strong>Chapter 1<\/strong><\/td><td><strong>Chapter 2<\/strong><\/td><td>Chapter 3<\/td><td><strong>Chapter 4<\/strong><\/td><td><strong>Chapter 5<\/strong><\/td><td><strong>Chapter 6<\/strong><\/td><\/tr><tr><td><strong>Chapter 7<\/strong><\/td><td><strong>Chapter 8<\/strong><\/td><td><strong>Chapter 9<\/strong><\/td><td><strong>Chapter 10<\/strong><\/td><td><strong>Chapter 11<\/strong><\/td><td><strong>Chapter 12<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-ncert-solutions-class-9-science-chapter-3-atoms-and-molecules-nbsp\">NCERT Solutions Class 9 Science Chapter 3 Atoms and Molecules&nbsp;<\/h2>\n\n\n\n<p>Here are NCERT Solutions of Class 9 Science Chapter 3 &#8216;Atoms and Molecules\u2019 to the questions in the exercise section of the lesson.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p><strong>1. A 0.24g sample of a compound of oxygen and boron was found by analysis to contain 0.096g of boron and 0.144g of oxygen. Calculate the percentage composition of the compound by weight.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:<\/p>\n\n\n\n<p>Mass of the sample compound = 0.24g,&nbsp;<\/p>\n\n\n\n<p>mass of boron = 0.096g, mass of oxygen = 0.144g<\/p>\n\n\n\n<p>To calculate the percentage composition of the compound,<\/p>\n\n\n\n<p>Percentage of boron = mass of boron \/ mass of the compound x 100<\/p>\n\n\n\n<p>= 0.096g \/ 0.24g x 100&nbsp; = 40%<\/p>\n\n\n\n<p>Percentage of oxygen = 100 \u2013 percentage of boron<\/p>\n\n\n\n<p>= 100 \u2013 40 = 60%<\/p>\n\n\n\n<p><strong>2. When 3.0g of carbon is burnt in 8.00 g of oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00g of carbon is burnt in 50.00 g of oxygen?&nbsp; Which law of chemical combination will govern your answer?<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:<\/p>\n\n\n\n<p>When 3.0 g of carbon is burnt in 8.00 g of oxygen, 11.00 g of carbon dioxide is produced.&nbsp;<\/p>\n\n\n\n<p>3.0 g of carbon combines with 8.0 g of oxygen to give 11.0 of carbon dioxide.&nbsp;<\/p>\n\n\n\n<p>C + O2 \u2192 CO2<\/p>\n\n\n\n<p>As per the given condition, when 3.0 g of carbon is burnt in 8.00 g of oxygen, 11.00 g of carbon dioxide is produced.<\/p>\n\n\n\n<p>3g + 8g \u219211 g ( from the above reaction)<\/p>\n\n\n\n<p>The total mass of reactants = mass of carbon + mass of oxygen<\/p>\n\n\n\n<p>=3g+8g<\/p>\n\n\n\n<p>=11g<\/p>\n\n\n\n<p>The total mass of reactants = Total mass of products<\/p>\n\n\n\n<p>Hence, the law of conservation of mass is proved.&nbsp;<\/p>\n\n\n\n<p>&nbsp;It depicts that carbon dioxide contains carbon and oxygen in a fixed ratio by mass, which is 3:8.<\/p>\n\n\n\n<p>Thus, it further proves the law of constant proportions.<\/p>\n\n\n\n<p>3 g of carbon must also combine with 8 g of oxygen only.<\/p>\n\n\n\n<p>This means that (50\u22128)=42g of oxygen will remain unreacted.<\/p>\n\n\n\n<p>The remaining 42 g of oxygen will be left un-reactive. In this case, too, only 11 g of carbon dioxide will be formed<\/p>\n\n\n\n<p>The law of constant proportions governs the above answer.<\/p>\n\n\n\n<p><strong>3. What are polyatomic ions? Give examples.<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:<\/p>\n\n\n\n<p>Ions that contain more than one atom, but behave as a single unit are known as polyatomic ions.&nbsp;<\/p>\n\n\n\n<p>Example: CO32-, H2PO4\u2013<\/p>\n\n\n\n<p><strong>4. Write the chemical formula of the following.<\/strong><\/p>\n\n\n\n<p><strong>(a) Magnesium chloride<\/strong><\/p>\n\n\n\n<p><strong>(b) Calcium oxide<\/strong><\/p>\n\n\n\n<p><strong>(c) Copper nitrate<\/strong><\/p>\n\n\n\n<p><strong>(d) Aluminium chloride<\/strong><\/p>\n\n\n\n<p><strong>(e) Calcium carbonate<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:&nbsp;<\/p>\n\n\n\n<p>(a) Magnesium chloride \u2013 MgCl2<\/p>\n\n\n\n<p>(b) Calcium oxide \u2013 CaO<\/p>\n\n\n\n<p>(c) Copper nitrate \u2013 Cu(NO3)2<\/p>\n\n\n\n<p>(d) Aluminium chloride \u2013 AlCl3<\/p>\n\n\n\n<p>(e) Calcium carbonate \u2013 CaCO3<\/p>\n\n\n\n<p><strong>5. Give the names of the elements present in the following compounds.<\/strong><\/p>\n\n\n\n<p><strong>(a) Quick lime<\/strong><\/p>\n\n\n\n<p><strong>(b) Hydrogen bromide<\/strong><\/p>\n\n\n\n<p><strong>(c) Baking powder<\/strong><\/p>\n\n\n\n<p><strong>(d) Potassium sulphate<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:&nbsp;<\/p>\n\n\n\n<p>(a) Quick lime \u2013 Calcium and oxygen (CaO)&nbsp;<\/p>\n\n\n\n<p>(b) Hydrogen bromide \u2013 Hydrogen and bromine (HBr)&nbsp;<\/p>\n\n\n\n<p>(c) Baking powder \u2013 Sodium, Carbon, Hydrogen, Oxygen (NaHCO3)&nbsp;<\/p>\n\n\n\n<p>(d) Potassium sulphate \u2013 Sulphur, Oxygen, Potassium (K2SO4)&nbsp;<\/p>\n\n\n\n<p><strong>6. Calculate the molar mass of the following substances.<\/strong><\/p>\n\n\n\n<p><strong>(a) Ethyne, C2H2<\/strong><\/p>\n\n\n\n<p><strong>(b) Sulphur molecule, S8<\/strong><\/p>\n\n\n\n<p><strong>(c) Phosphorus molecule, P4 (Atomic mass of phosphorus =31)<\/strong><\/p>\n\n\n\n<p><strong>(d) Hydrochloric acid, HCl<\/strong><\/p>\n\n\n\n<p><strong>(e) Nitric acid, HNO3<\/strong><\/p>\n\n\n\n<p><strong>Solution<\/strong>:&nbsp;<\/p>\n\n\n\n<p>(a) Molar mass of Ethyne C2H2= 2 x Mass of C+2 x Mass of H = (2\u00d712)+(2\u00d71)=24+2=26g<\/p>\n\n\n\n<p>(b) Molar mass of Sulphur molecule S8 = 8 x Mass of S = 8&nbsp; x 32 = 256g<\/p>\n\n\n\n<p>(c) Molar mass of&nbsp; Phosphorus molecule, P4 = 4 x Mass of P = 4 x 31 = 124g<\/p>\n\n\n\n<p>(d) Molar mass of Hydrochloric acid, HCl = Mass of H+ Mass of Cl = 1+35.5 = 36.5g<\/p>\n\n\n\n<p>(e) Molar mass of Nitric acid, HNO3 =Mass of H+ Mass of Nitrogen + 3 x Mass of O = 1 + 14+3\u00d716 = 63g<\/p>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-light-green-cyan-background-color has-text-color has-background has-link-color has-medium-font-size wp-elements-ef94ddec1f708b3c29bf47c89c31425f\"><a href=\"https:\/\/drive.google.com\/file\/d\/1Kb5eL-5eSk-8DVEHSdxF4NL8_L9y-ewA\/view?usp=sharing\"><strong>Download the NCERT Solutions of Class 9 Science Chapter 3 PDF Here!&nbsp;<\/strong><\/a><\/p>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-link-color has-medium-font-size wp-elements-05206ece9cd525eff372b47e63815144\"><strong>Download Solutions of all the Chapters of Class 9 Science<\/strong>:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table class=\"has-very-light-gray-to-cyan-bluish-gray-gradient-background has-background\"><tbody><tr><td><strong>Chapter 1<\/strong><\/td><td><strong>Chapter 2<\/strong><\/td><td>Chapter 3<\/td><td><strong>Chapter 4<\/strong><\/td><td><strong>Chapter 5<\/strong><\/td><td><strong>Chapter 6<\/strong><\/td><\/tr><tr><td><strong>Chapter 7<\/strong><\/td><td><strong>Chapter 8<\/strong><\/td><td><strong>Chapter 9<\/strong><\/td><td><strong>Chapter 10<\/strong><\/td><td><strong>Chapter 11<\/strong><\/td><td><strong>Chapter 12<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-link-color has-medium-font-size wp-elements-80ef5f15df2684fb77861c1f4398db6c\"><strong>Related Reads<\/strong>:&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>Chemistry in Everyday Life<\/strong><\/td><td><a href=\"https:\/\/leverageedu.com\/blog\/branches-of-chemistry\/\"><strong>All Branches of Chemistry with Examples, PDF, PPT<\/strong><\/a><strong>&nbsp;<\/strong><\/td><\/tr><tr><td><strong>What is the Importance and Scope of Chemistry?<\/strong><strong>&nbsp;<\/strong><\/td><td><strong>Basic Chemistry Concepts for Competitive Exams<\/strong><strong>&nbsp;<\/strong><\/td><\/tr><tr><td><strong>BSc Chemistry Honours: Syllabus, Eligibility, Career Scope<\/strong><strong>&nbsp;<\/strong><\/td><td><strong>Career in Chemistry: Top Courses, Universities &amp; Scope<\/strong><strong>&nbsp;<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-text-align-center has-vivid-red-color has-text-color has-link-color has-medium-font-size wp-elements-40d49b8241bdde0c7d68e5cb69662d10\"><strong>Explore Notes of All subjects of CBSE Class 9:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table is-style-stripes\"><table><tbody><tr><td><strong>CBSE Notes Class 9 English<\/strong><\/td><td><strong>CBSE Notes Class 9 History&nbsp;<\/strong><\/td><td><strong>CBSE Notes Class 9 Geography<\/strong><\/td><\/tr><tr><td><strong>CBSE Notes Class 9 Civics<\/strong><\/td><td><strong>CBSE Notes Class 9 Mathematics<\/strong><\/td><td><a href=\"https:\/\/leverageedu.com\/discover\/school-education\/cbse-notes-class-9-science\/\"><strong>CBSE Notes Class 9 Science<\/strong><\/a><strong>&nbsp;<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faqs\">FAQs<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1713345396261\"><strong class=\"schema-faq-question\">What is an atom Class 9 short answer Chapter 3?\u00a0<\/strong> <p class=\"schema-faq-answer\">The smallest unit of matter or any element that exhibits its properties is known as an atom.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1713345415465\"><strong class=\"schema-faq-question\">What is valency Class 9?\u00a0<\/strong> <p class=\"schema-faq-answer\">The ability of an atom or the combining power of an atom to for bonds with other atoms is called valency.\u00a0<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1713345435662\"><strong class=\"schema-faq-question\">What is the full form of amu?\u00a0<\/strong> <p class=\"schema-faq-answer\">The full form of amu is \u201cAtomic Mass Unit\u201d.\u00a0<\/p> <\/div> <\/div>\n\n\n\n<p>Follow Leverage Edu for complete study material on <a href=\"https:\/\/leverageedu.com\/discover\/school-education\/cbse-notes-class-9-science\/\"><strong>CBSE Notes of Class 9 Science<\/strong><\/a>.&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"We are providing NCERT Solutions Class 9 Science Chapter 3 &#8216;Atoms and Molecules&#8217; to help you navigate through&hellip;\n","protected":false},"author":109,"featured_media":821882,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"editor_notices":[],"footnotes":""},"categories":[477,389],"tags":[],"class_list":{"0":"post-821880","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-ncert-study-material","8":"category-school-education"},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions Class 9 Science Chapter 3 &#039;Atoms and Molecules&#039; (Free PDF)\u00a0 | Leverage Edu Discover<\/title>\n<meta name=\"description\" content=\"Get important questions and answers in NCERT Solutions Class 9 Science Chapter 3 (Atoms and Molecules). 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