{"id":19437,"date":"2018-08-24T06:36:11","date_gmt":"2018-08-24T06:36:11","guid":{"rendered":"https:\/\/cbselibrary.com\/?p=19437"},"modified":"2020-12-03T17:46:58","modified_gmt":"2020-12-03T12:16:58","slug":"selina-icse-solutions-class-9-chemistry-chemical-changes-reactions","status":"publish","type":"post","link":"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-chemistry-chemical-changes-reactions\/","title":{"rendered":"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions"},"content":{"rendered":"<h2><span style=\"color: #00ccff;\">Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions<\/span><\/h2>\n<p><a class=\"button-red\" title=\"ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/icse-solutions\/\">ICSE Solutions<\/a><a class=\"button-blue\" title=\"Selina Concise ICSE Solutions for Class 10, 9, 8, 7 and 6\" href=\"https:\/\/cbselibrary.com\/selina-concise-icse-solutions\/\">Selina ICSE Solutions<\/a><\/p>\n<p>APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 9 Chemistry Chapter 2 Chemical Changes and Reactions. You can download the Selina Concise Chemistry ICSE Solutions for Class 9 with Free PDF download option. Selina Publishers Concise Chemistry for Class 9 ICSE Solutions all questions are solved and explained by expert teachers as per ICSE board guidelines.<\/p>\n<p><span style=\"color: #00ccff;\"><strong>PAGE NO: 22<br \/>\n<\/strong><\/span><\/p>\n<p>Question 1.<br \/>\n(a) What is a chemical reaction?<br \/>\n(b) State the conditions necessary for a chemical change or reaction.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ol>\n<li>A chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).<\/li>\n<li>Conditions necessary for a chemical change or reaction are\n<ul>\n<li>Evolution of gas<\/li>\n<li>Change of colour<\/li>\n<li>Formation of precipitate<\/li>\n<li>Change of state<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>Question 2.<br \/>\nDefine the following terms<br \/>\na. Chemical bond<br \/>\nb. Effervescence<br \/>\nc. Precipitate<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ul>\n<li>A chemical bond is the force which holds the atoms of a molecule together as in a compound.<\/li>\n<li>Formation of gas bubbles in a liquid during a reaction is called effervescence.<\/li>\n<li>Chemical reactions which are characterised by the formation of insoluble solid substances are called precipitates.<\/li>\n<\/ul>\n<p>Question 3.<br \/>\nGive an example of a reaction where the following are involved<br \/>\n(a) Heat<br \/>\n(b) Light<br \/>\n(c) Electricity<br \/>\n(d) Close contact<br \/>\n(e) Solution<br \/>\n(f) Pressure<br \/>\n(g) Catalyst<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121859\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-1.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 1\" width=\"347\" height=\"384\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-1.png 347w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-1-271x300.png 271w\" sizes=\"(max-width: 347px) 100vw, 347px\" \/><\/p>\n<p>Question 4.<br \/>\nDefine<br \/>\n(a) Photochemical reaction<br \/>\n(b) Electrochemical reaction<br \/>\nGive an example in each case.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121860\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-2.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 2\" width=\"428\" height=\"131\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-2.png 428w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-2-300x92.png 300w\" sizes=\"(max-width: 428px) 100vw, 428px\" \/><\/p>\n<p>Question 5.<br \/>\nGive an example of each of the following chemical changes:<br \/>\nA photochemical reaction involving<br \/>\n(i) silver salt (ii) water<br \/>\nA reaction involving<br \/>\n(i) blue solution<br \/>\n(ii) formation of dirty green precipitate<br \/>\nTwo gases combine to form white solid<br \/>\nTwo solids combine to form a liquid<br \/>\nA reaction where colour change is noticed<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121861\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-3.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 3\" width=\"391\" height=\"379\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-3.png 391w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-3-300x291.png 300w\" sizes=\"(max-width: 391px) 100vw, 391px\" \/><\/p>\n<p>Question 6.<br \/>\nWrite the chemical reaction where the following changes are observed.<br \/>\n(a) Gas is evolved<br \/>\n(b) Colour change is noticed<br \/>\n(c) Precipitate is formed<br \/>\n(d) Physical state is changed<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121862\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-4.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 4\" width=\"341\" height=\"241\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-4.png 341w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-4-300x212.png 300w\" sizes=\"(max-width: 341px) 100vw, 341px\" \/><\/p>\n<p>Question 7.<br \/>\nGive reason for the following:<br \/>\nSilver nitrate solution is kept in coloured bottles.<br \/>\nMolybdenum is used in the manufacture of ammonia.<br \/>\nBlue solution of copper sulphate changes to green when a piece of iron is added to this solution.<br \/>\nColourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ul>\n<li>Silver nitrate solution is kept in brown bottles in the laboratory because it decomposes in the presence of light.<\/li>\n<li>Molybdenum increases the efficiency of the catalyst iron used in the manufacture of ammonia.<\/li>\n<li>This is because the blue colour of the copper sulphate solution fades and eventually turns into light green due to the formation of ferrous sulphate.<\/li>\n<\/ul>\n<p><span style=\"color: #00ccff;\"><strong>PAGE NO: 27<\/strong><\/span><\/p>\n<p>Question 1<br \/>\nComplete the following statements:<br \/>\nThe chemical change involving iron and hydrochloric acid illustrates a _________________ reaction.<br \/>\nIn the type of reaction called_______________, two compounds exchange their positive and negative radicals.<br \/>\nA catalyst either ______ or _____________ the rate of a chemical change but itself remains ______________ at the end of the reaction.<br \/>\nOn heating, hydrated copper sulphate changes its colour from ________ to __________.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ul>\n<li>Displacement<\/li>\n<li>Double decomposition<\/li>\n<li>Accelerate, decelerate, unaffected<\/li>\n<li>Blue, white<\/li>\n<\/ul>\n<p>Question 2.<br \/>\nWhen hydrogen burns in oxygen, water is formed; when electricity is passed through water, hydrogen and oxygen are given out. Name the type of chemical change involved in the two cases.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nCombination<br \/>\nDecomposition<\/p>\n<p>Question 3.<br \/>\nExplain, giving one example for each of the following chemical changes:<br \/>\n(a) Double decomposition<br \/>\n(b) Thermal decomposition<br \/>\n(c) Reversible reaction<br \/>\n(d) Displacement<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121863\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-5.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 4\" width=\"646\" height=\"340\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-5.png 646w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-5-300x158.png 300w\" sizes=\"(max-width: 646px) 100vw, 646px\" \/><\/p>\n<p>Question 4.<br \/>\n(a) What is synthesis?<br \/>\n(b) What kind of chemical reaction is synthesis? Support your answer by an example.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nA reaction in which two or more substances combine together to form a single substance is called a synthesis or combination reaction.<br \/>\nA + B \u2192 AB<br \/>\nIn the above reaction, substances A and B combine to give a molecule of a new substance, AB.<br \/>\nCarbon burns in oxygen to form a gaseous compound, carbon dioxide.<br \/>\nC + O<sub>2<\/sub> \u2192 CO<sub>2<\/sub><\/p>\n<p>Question 5.<br \/>\nDecomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121864\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-6.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 6\" width=\"576\" height=\"115\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-6.png 576w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-6-300x60.png 300w\" sizes=\"(max-width: 576px) 100vw, 576px\" \/><\/p>\n<p>Question 6.<br \/>\nDefine neutralization reaction with an example.<br \/>\nGive balanced equation for this reaction.<br \/>\nGive three applications of neutralization reactions.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nThe reaction between an acid and a base which forms salt and water only is referred to as reaction of neutralisation.<br \/>\nApplications of neutralisation reactions:<\/p>\n<ul>\n<li>When someone is stung by a bee, formic acid enters the skin and causes pain, which can be relieved by rubbing the spot with slaked lime or baking soda, both of which are bases.<\/li>\n<li>Acid which accidentally spills on to our clothes can be neutralised with ammonia solution.<\/li>\n<li>If the soil is somewhat acidic and thus unfavourable for growing of certain crops, then slaked lime is added to neutralise the excess acid.<\/li>\n<\/ul>\n<p><span style=\"color: #eb4924;\">Solution 7:<\/span><br \/>\nHydrolysis is the process in which a salt and water react to form an acidic or basic solution.<br \/>\nIn the process of hydrolysis, only those salts hydrolyse which are formed by the reaction of<\/p>\n<ul>\n<li>strong base and weak acid<\/li>\n<li>strong acid and weak base<\/li>\n<\/ul>\n<p>This happens because a salt formed due to a strong base and a weak acid on dissolving in water will form a basic solution.<br \/>\nA basic solution turns red litmus blue.<br \/>\nNa<sub>2<\/sub>CO<sub>3<\/sub> + 2H<sub>2<\/sub>O \u2192 2NaOH + H<sub>2<\/sub>CO<sub>3<\/sub><br \/>\nHowever, the salt formed due to a strong acid and a weak base on dissolving in water will make an acidic solution. Acidic solutions turn blue litmus red.<br \/>\nFeCl<sub>3<\/sub> + 3H<sub>2<\/sub>O \u2192 Fe(OH)<sub>3<\/sub> + 3HCl<\/p>\n<p><span style=\"color: #eb4924;\">Solution 8:<\/span><br \/>\nIron(III) chloride is a salt prepared from strong acid HCl and a weak base Fe(OH)<sub>3<\/sub>.<br \/>\nFe(OH)<sub>3<\/sub> + 3HCl\u2192 FeCl<sub>3<\/sub> + 3H<sub>2<\/sub>O<br \/>\nOn the other hand, sodium carbonate is a salt prepared from a strong base NaOH and a weak acid H<sub>2<\/sub>CO<sub>3<\/sub>.<br \/>\nFe(OH)<sub>3<\/sub> + 3HCl \u2192 FeCl<sub>3<\/sub> + 3H<sub>2<\/sub>O<\/p>\n<p>Question 9<br \/>\n(a) What is decomposition?<br \/>\n(b) Support your answer by an example.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nDecomposition is the breaking up of a compound either into elements or simpler compounds such that these products do not combine to form the original compound.<br \/>\nDecomposition may occur in the presence of heat or light or by the passage of an electric current.<br \/>\nExample: Mercuric oxide when heated decomposes to form two elements-mercury and oxygen.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121865\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-7.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 7\" width=\"198\" height=\"38\" \/><\/p>\n<p>Question 10.<br \/>\nState the type of reactions each of the following represent and balance the ones that are not balanced.<br \/>\n(a) Cl<sub>2<\/sub> + 2KBr \u2192 2KCl + Br<sub>2<\/sub><br \/>\n(b) NaOH + HCl \u2192 NaCl + H<sub>2<\/sub>O<br \/>\n(c) 2HgO \u2192 2Hg + O<sub>2<\/sub><br \/>\n(d) Fe + CuSO<sub>4<\/sub>\u2192 FeSO<sub>4<\/sub> + Cu<br \/>\n(e) PbO<sub>2<\/sub> + SO<sub>2<\/sub>\u2192 PbSO<sub>4<\/sub><br \/>\n(f) 2KClO<sub>3<\/sub>\u2192 2KCl + 3O<sub>2<\/sub><br \/>\n(g) 2H<sub>2<\/sub>O<sub>2<\/sub>\u2192 2H<sub>2<\/sub>O + O<sub>2<\/sub><br \/>\n(h) KNO<sub>3<\/sub> + H<sub>2<\/sub>SO<sub>4<\/sub> \u2192 HNO<sub>3<\/sub> + KHSO<sub>4<\/sub><br \/>\n(i) CuO + H<sub>2<\/sub>\u2192 Cu+ H<sub>2<\/sub>O<br \/>\n(j) CaCO<sub>2<\/sub>\u2192 CaO + CO<sub>2<\/sub><br \/>\n(k) NH4Cl \u2192 NH3 + HCl<br \/>\n(l) PbO + 2HNO<sub>3<\/sub>\u2192 Pb(NO<sub>3<\/sub>) + 2H<sub>2<\/sub>O<br \/>\n(m) AgNO<sub>3<\/sub> + NaCl \u2192 AgCl + NaNO<sub>3<\/sub><\/p>\n<p><span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ul>\n<li>Cl<sub>2<\/sub> + 2KBr \u2192 2KCl + Br<sub>2<\/sub><br \/>\nDisplacement<\/li>\n<li>Fe + CuSO<sub>4<\/sub> \u2192 FeSO<sub>4<\/sub> + Cu<br \/>\nDisplacement<\/li>\n<li>2H<sub>2<\/sub>O \u2192 2Hg + O<sub>2<\/sub><br \/>\nDecomposition<\/li>\n<li>PbO<sub>2<\/sub> + SO<sub>2<\/sub> \u2192 PbSO<sub>4<\/sub><br \/>\nCombination<\/li>\n<li>AgNO<sub>3<\/sub> + NaCl \u2192 AgCl + NaNO<sub>3<\/sub><br \/>\nDouble decomposition<\/li>\n<li>2KClO<sub>3<\/sub> \u2192 2KCl + 3O<sub>2<\/sub><br \/>\nDecomposition<\/li>\n<li>2H<sub>2<\/sub>O<sub>2<\/sub> \u2192 2H<sub>2<\/sub>O + O<sub>2<\/sub><br \/>\nDecomposition<\/li>\n<li>KNO<sub>3<\/sub> + H<sub>2<\/sub>SO<sub>4<\/sub> \u2192 HNO<sub>3<\/sub> + KHSO<sub>4<\/sub><br \/>\nDouble decomposition<\/li>\n<li>CuO + H<sub>2<\/sub> \u2192 Cu + H<sub>2<\/sub>O<br \/>\nDisplacement<\/li>\n<li>CaCO<sub>3<\/sub> \u2192 CaO + CO<sub>2<\/sub><br \/>\nDecomposition<\/li>\n<li>NH<sub>4<\/sub>Cl \u2192 NH<sub>3<\/sub> + HCl<br \/>\nDecomposition<\/li>\n<\/ul>\n<p><span style=\"color: #00ccff;\"><strong>PAGE NO: 30<\/strong><\/span><\/p>\n<p>Question 1.<br \/>\nExplain the main characteristics reactions<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121866\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-8.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 8\" width=\"664\" height=\"382\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-8.png 664w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-8-300x173.png 300w\" sizes=\"(max-width: 664px) 100vw, 664px\" \/><\/p>\n<div class=\"questtl\">Question 2.<br \/>\nDefine exothermic and endothermic changes. Give two examples in each case.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121867\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-9.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 9\" width=\"615\" height=\"436\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-9.png 615w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-9-300x213.png 300w\" sizes=\"(max-width: 615px) 100vw, 615px\" \/><\/div>\n<div><\/div>\n<div class=\"questtl\">Question 3.<br \/>\nState the effects of endothermic and exothermic reactions on the surroundings.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nExothermic reactions are spontaneous and warm their surroundings with the release of heat energy.<br \/>\nEndothermic reactions absorb heat energy from their surroundings and cause their surroundings to cool down.<\/div>\n<div><\/div>\n<div class=\"questtl\">Question 4.<br \/>\nGive an example of a reaction\u00a0where the following are involved<br \/>\n(a) Evolution of heat<br \/>\n(b) Absorption of heat<br \/>\n(c) High pressure is required<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121868\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-10.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 10\" width=\"228\" height=\"118\" \/><\/div>\n<div><\/div>\n<div class=\"questtl\">Question 5.<br \/>\nDefine:<br \/>\n(a) Photochemical reaction<br \/>\n(b) Electrochemical reaction<br \/>\nGive one example in each case.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121869\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-11.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 11\" width=\"392\" height=\"202\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-11.png 392w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-11-300x155.png 300w\" sizes=\"(max-width: 392px) 100vw, 392px\" \/><\/div>\n<div class=\"questtl\">Question 6.<br \/>\nGive an example of each of the following chemical changes.<br \/>\n(a) A reaction involving<br \/>\n(<span class=\"SpellE\">i<\/span>) Change of state<\/div>\n<div class=\"questtl\">(ii) formation of precipitate<br \/>\n(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.<br \/>\n(c) A reaction where\u00a0<span class=\"SpellE\">colour<\/span>\u00a0change is noticed.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121870\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-12.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 12\" width=\"640\" height=\"450\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-12.png 640w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-12-300x211.png 300w\" sizes=\"(max-width: 640px) 100vw, 640px\" \/><\/div>\n<div class=\"questtl\">Question 7.<br \/>\nWhat do you understand by &#8216;chemical reaction&#8217;?<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\nA chemical reaction is the process of breaking the chemical bonds of the reacting substances (reactants) and making new bonds to form new substances (products).<br \/>\nA chemical change or chemical reaction occurs when particles collide. Collisions occur when reactants are in close contact or by supply of energy.<\/div>\n<div><\/div>\n<div class=\"questtl\">Question 8.<br \/>\nComplete and balance the following reactions:<br \/>\n(a)\u00a0<span class=\"SpellE\">NaCl<\/span><sub>(<span class=\"SpellE\">aq<\/span>)<\/sub>\u00a0+ AgNO<sub>3(<span class=\"SpellE\">aq<\/span>)<\/sub>\u00a0\u2192<br \/>\n(b)\u00a0<span class=\"SpellE\">Pb<\/span>(NO<sub>3<\/sub>)<sub>2<\/sub>\u00a0+ KI \u2192<br \/>\n(c) CuCO<sub>3<\/sub><img loading=\"lazy\" src=\"https:\/\/images.topperlearning.com\/topper\/question_uploads\/ICSE_Chem_IX_Selina_Ch2C_ChemChangandReac_TBS_RWD_files\/20170817115857_image002.png\" alt=\"Selina Solutions Icse Class 9 Chemistry Chapter - Chemical Changes And Reactions\" width=\"53\" height=\"21\" \/><br \/>\n(d)\u00a0<span class=\"SpellE\">Pb<\/span>(NO<sub>3<\/sub>)<sub>2<\/sub><img loading=\"lazy\" src=\"https:\/\/images.topperlearning.com\/topper\/question_uploads\/ICSE_Chem_IX_Selina_Ch2C_ChemChangandReac_TBS_RWD_files\/20170817115857_image002.png\" alt=\"Selina Solutions Icse Class 9 Chemistry Chapter - Chemical Changes And Reactions\" width=\"53\" height=\"21\" \/><br \/>\n(e) NH<sub>3<\/sub>\u00a0+ O<sub>2<\/sub><img loading=\"lazy\" src=\"https:\/\/images.topperlearning.com\/topper\/question_uploads\/ICSE_Chem_IX_Selina_Ch2C_ChemChangandReac_TBS_RWD_files\/20170817115857_image017.png\" alt=\"Selina Solutions Icse Class 9 Chemistry Chapter - Chemical Changes And Reactions\" width=\"59\" height=\"21\" \/><br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-121871\" src=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-13.png\" alt=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions image - 13\" width=\"303\" height=\"122\" srcset=\"https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-13.png 303w, https:\/\/cbselibrary.com\/wp-content\/uploads\/2020\/12\/Selina-Concise-Chemistry-Class-9-ICSE-Solutions-Chemical-Changes-and-Reactions-image-13-300x121.png 300w\" sizes=\"(max-width: 303px) 100vw, 303px\" \/><\/div>\n<p style=\"font-weight: 500;\">Question 9.<br \/>\nWhat do you observe? When<\/p>\n<ol>\n<li>Lead nitrate is heated.<\/li>\n<li>Silver chloride is exposed to sunlight.<\/li>\n<li>Hydrogen peroxide is exposed to sunlight.<\/li>\n<li>H<sub>2<\/sub>S gas is passed through copper\u00a0sulphate\u00a0solution.<\/li>\n<li>Barium chloride is added to sodium\u00a0sulphate\u00a0solution<\/li>\n<li>Water is added to the quick lime.<\/li>\n<li>Sodium chloride solution is added to silver nitrate solution.<\/li>\n<\/ol>\n<p><span style=\"color: #eb4924;\">Solution:<\/span><\/p>\n<ul>\n<li>Lead nitrate decomposes on heating leaving a yellow residue lead monoxide, brown gas nitrogen dioxide and colourless gas oxygen.<\/li>\n<li>If chlorine water is exposed to sunlight, oxygen is evolved.<\/li>\n<li>Hydrogen peroxide breaks down to form water and oxygen gas along with heat energy.<\/li>\n<li>When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution.<\/li>\n<li>A white insoluble precipitate of barium sulphate is formed.<\/li>\n<\/ul>\n<div class=\"questtl\">Question 10.<br \/>\n(a)\u00a0<span class=\"GramE\">a<\/span>\u00a0carbonate which do not decompose on heating.<br \/>\n(b)\u00a0<span class=\"GramE\">a<\/span>\u00a0nitrate which produces oxygen as the only gas.<br \/>\n(c) a compound which produces carbon dioxide on heating<br \/>\n(d)\u00a0<span class=\"GramE\">a<\/span>\u00a0nitrate which produces brown gas on heating.<br \/>\n<span style=\"color: #eb4924;\">Solution:<\/span><\/div>\n<ul>\n<li>Sodium carbonate<\/li>\n<li>Sodium nitrate<\/li>\n<li>Zinc carbonate<\/li>\n<li>Lead nitrate<\/li>\n<\/ul>\n<p><strong>More Resources for Selina Concise Class 9 ICSE Solutions<\/strong><\/p>\n<ul>\n<li><a href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-chemistry\/\">Concise Chemistry Class 9 ICSE Solutions<\/a><\/li>\n<li><a href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-physics\/\">Concise Physics Class 9 ICSE Solutions<\/a><\/li>\n<li><a href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-biology\/\">Concise Biology Class 9 ICSE Solutions<\/a><\/li>\n<li><a href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-maths\/\">Concise Mathematics Class 9 ICSE Solutions<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 9 Chemistry Chapter 2 Chemical Changes and Reactions. You can download the Selina Concise Chemistry ICSE Solutions for Class 9 with Free PDF download option. Selina Publishers &#8230; <a title=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions\" class=\"read-more\" href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-chemistry-chemical-changes-reactions\/\" aria-label=\"More on Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions\">Read more<\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[84,3034],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.8 (Yoast SEO v18.4.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions - CBSE Library<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cbselibrary.com\/selina-icse-solutions-class-9-chemistry-chemical-changes-reactions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions\" \/>\n<meta property=\"og:description\" content=\"Selina Concise Chemistry Class 9 ICSE Solutions Chemical Changes and Reactions ICSE SolutionsSelina ICSE Solutions APlusTopper.com provides step by step solutions for Selina Concise ICSE Solutions for Class 9 Chemistry Chapter 2 Chemical Changes and Reactions. 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