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A change in which a substance undergoes a change in its physical properties is called a physical change. A physical change is generally reversible. In such a change no new substance is formed.\u003Cbr>CHEMICAL CHANGE\u003Cbr>A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction\u003Cbr>CHEMICAL REACTION & EQUATIONS\u003Cbr>􀁸 A complete chemical equation represents the reactants, products and their physical State symbolically.\u003Cbr>􀁸 Following observations helps us to determine whether a chemical reaction has taken place\u003Cbr>􀂃 Change in state\u003Cbr>􀂃 Change in colour\u003Cbr>􀂃 Evolution of a gas\u003Cbr>􀂃 Change in temperature.\u003Cbr>􀁸 Some of the example of chemical reactions in everyday life\u003Cbr>􀂃 Photosynthesis\u003Cbr>􀂃 Aerobic Cellular Respiration\u003Cbr>􀂃 Combustion of wood\u003Cbr>Page 2 of 67 |  |  |\n| |  |  |\n| Get High Standard Mock Test Series for all Bank Exams\u003Cbr>If there are any suggestions/ errors in our PDFs Feel Free to contact us via this email: admin@exampundit.in |  |  |\n\n\n| | | |\n| --- | --- | --- |\n| THE COMPLETE General Science Notes (Chemistry) for Railway Exams |  |  |\n|  |  |  |\n| 􀂃 Rusting of iron\u003Cbr>􀂃 Metathesis\u003Cbr>􀂃 Digestion\u003Cbr>􀂃 Cooking an egg\u003Cbr>􀂃 Souring of milk\u003Cbr>􀂃 Rotting bananas\u003Cbr>􀁸 Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light\u003Cbr>􀁸 Reactions in which energy is absorbed are known as endothermic reactions.\u003Cbr>BALANCED CHEMICAL EQUATIONS\u003Cbr>􀁸 Mass can neither be created nor destroyed in a chemical reaction. That is, the total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants\u003Cbr>􀁸 The number of atoms of each element remains the same, before and after a chemical reaction Some of the example of balanced equations\u003Cbr>Zn + H2SO4- 􀃆ZnSO4 + H2\u003Cbr>3Fe + 4H2O 􀃆Fe3O4 + 4H2\u003Cbr>TYPES OF CHEMICAL REACTIONS\u003Cbr>1. COMBINATION REACTION\u003Cbr>􀁸 In a combination reaction two or more substances combine to form a new single Substance.\u003Cbr>Example of combination reaction\u003Cbr>􀁸 Calcium oxide reacts vigorously with water to produce slaked lime(calcium hydroxide) Releasing a large amount of heat\u003Cbr>CaO (s) + H2O (l) -->Ca (OH)2 + Heat\u003Cbr>􀁸 A solution of slaked lime produced by the above reaction is used for white washing wall\u003Cbr>Page 3 of 67 |  |  |\n| |  |  |\n| Get High Standard Mock Test Series for all Bank Exams\u003Cbr>If there are any suggestions/ errors in our PDFs Feel Free to contact us via this email: admin@exampundit.in |  |  |\n\n\n| | | |\n| --- | --- | --- |\n| THE COMPLETE General Science Notes (Chemistry) for Railway Exams |  |  |\n|  |  |  |\n| NOTE: Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls. Calcium carbonate is formed after two to three days of whitewashing and gives a shiny finish to the walls. It is interesting to note that the chemical formula for marble is also CaCO3.\u003Cbr>\u003Cbr>2. DECOMPOS","cbCaigQoJ4rz9Lz0","https://ap.wps.com/l/cbCaigQoJ4rz9Lz0","pdf",1349836,67,"English","# General Science-Chemistry\n## Chemical reactions and equations\n## Matter\n## Atoms and molecules\n## Carbon and its compounds\n## Periodic Classification of Elements\n## Coal and petroleum\n## Acids Bases and Salts\n## Metals and Nonmetals\n## Combustion and Flame\n## Important chemicals and their uses\n## Important Chemistry one liners","[{\"question\":\"What is the difference between physical and chemical changes?\",\"answer\":\"Physical changes alter properties like shape, size, colour, or state without forming new substances and are generally reversible. Chemical changes form one or more new substances and are also called chemical reactions.\"},{\"question\":\"How can you tell that a chemical reaction has taken place?\",\"answer\":\"Indicators include change in state, change in colour, evolution of a gas, and change in temperature.\"},{\"question\":\"What do balanced chemical equations mean?\",\"answer\":\"In a balanced chemical equation, mass is conserved and the number of atoms of each element remains the same before and after the reaction.\"}]","THE COMPLETE General Science Notes (Chemistry) for Railway Exams | PDF",169]