Class 10 Economics (understanding economic development) NCERT book

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Class 10th Science NCERT book

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Hi guys welcome to my website Notespoint. In this post you all will get PDF link of class 10th Ncert Science book - Chapter 1 chemical reaction and equation Chapter 2 Acid bases and salt Chapter 3 metal and nonmetal Chapter 4 carbon and its compound Chapter 5 periodic classification of elements Chapter 6 life process Chapter 7 control and coordination Chapter 8 How do organisms reproduce Chapter 9 Heredity and Evolution Chapter 10 light reflection and refraction Chapter 11 the human eye and the colourful world Chapter 12 electricity Chapter 13 magnetic effect of electric current Chapter 14 sources of energy Chapter 15 our environment Chapter 16 sustainable management of natural resources
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Chapter 1 - Chemical Reactions and Equations What is Chemical change? Chemical change is a change in which one or more new substances are formed. In a chemical change— • New substances are formed. • Energy changes are involved.  • There is a change in mass during the reaction. • Permanent change takes place.  Examples – ❖ Cooking of food ❖ Rusting of iron ❖ Heating of Lead nitrate ❖ Souring of milk ❖ Ripening of fruit. Rusting of iron is a chemical change because ❖ A new substance iron oxide is formed. ❖ The change is permanent; the article has got a rust layer (which may only peal off). ❖ There is an increase in mass when rust forms. ❖ An energy change has taken place (which may not be visible). Chemical changes are also known as chemical reactions. Exothermic Reaction - A chemical reaction which is accompanied by evolution of heat energy  is known as exothermic reaction.   The amount of heat (energy) produced is written along with the products. This indicates that...
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