GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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absorbs energy from the surroundings
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releases energy into the surroundings
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creates energy that did not previously exist
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uses up energy that then no longer exists
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Detailed explanation-1: -Chemical reactions that release energy are called exothermic. 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.
Detailed explanation-2: -In all types of chemical reactions, bonds are broken and reassembled to form new products. However, in exothermic, endothermic, and all chemical reactions, it takes energy to break the existing chemical bonds and energy is released when the new bonds form.
Detailed explanation-3: -Answer and Explanation: Chemical bonds contain potential energy. This energy is stored in covalent bonds that have the potential to hold various atoms together in order to form a molecule. This energy is also known as chemical energy.
Detailed explanation-4: -Bond forming is an exothermic process, because it releases energy. In reaction profile diagram, the energy change in a reaction, is the difference between the reactants and products. In an endothermic reaction, energy is taken in from the surroundings. The temperature of the surroundings therefore decreases.