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Carbon dioxide + HeatĪ change or reaction in which heat is absorbed from the surrounding is called an endothermic reaction.įor example in a reaction between carbon and sulphur, carbon disulphide is formed with the absorption of heat.Ĭarbon + Sulphur + Heat ……. Some chemical reactions produce heat while some take away heat.Ī change or reaction in which heat is released is called an exothermic reaction.įor example In a reaction between carbon and oxygen, carbon dioxide is formed with the generation of heat.Ĭarbon + Oxygen ……. Some of the properties of a chemical change or chemical reaction are:Ĭhange in energy: Almost all chemical reactions involved energy change. Thus, a chemical change is also called a chemical reaction. Chemical reaction: A chemical change occurs when chemicals react with each other. For example cooking food, ripening of fruit, lighting a matchstick, aging of leaves and digestion of food etc. A chemical change is mostly Irreversible. Chemical changes: A Chemical change occurs when two or more chemical substances react to form new product that have an entirely different set of properties. A physical change is a reversible change.įor example heating of water melting of butter, cutting of paper etc. Physical changes: When a substance undergoes a physical change, it does not give rise to a different kind of substance or there is no new substance is formed. Milk turns sour, seed germinate, the weather changes and fruit ripen.Ĭhanges can be of different types: desirable and undesirable changes, slow and fast changes, temporary and permanent changes, reversible and Irreversible changes and physical and chemical changes.Īll these changes involve one or more substances.
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