SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Released
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Absorbed
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Stored
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Doubled
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Detailed explanation-1: -In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Exothermic reactions are accompanied by an increase in temperature of the reaction mixture. Chemical reactions that absorb (or use) energy overall are called endothermic.
Detailed explanation-2: -Energy released or stored in a reaction will often be expressed written as H, or a change in enthalpy. A positive H means that energy is stored and the reaction is endothermic. A negative H means that energy is released and the reaction is exothermic.
Detailed explanation-3: -The energy given off is usually in the form of heat (although a few reactions give off energy as light). In the course of an exothermic reaction, heat flows from the system to its surroundings, and thus, gets warm. Heat is absorbed by reactants to form products.