define exothermic and endothermic change
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exothermic-A chemical change in which heat is given out is called an exothermic change. It causes a rise in temperature. Examples: Respiration, rusting, burning of coal, petrol and kerosene are some common examples of exothermic reactions.
endothermic- A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases.
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