define endothermic and exothermic change
Asked by arajeevshashank
| 7th Nov, 2017,
08:41: PM
Expert Answer:
Exothermic reactions
A chemical reaction in which heat is given out is called an exothermic reaction. It causes a rise in temperature.
Respiration, rusting, burning of coal, petrol and kerosene are some common examples of exothermic reactions.
Examples:
A lot of heat is produced when carbon burns in oxygen to form carbon dioxide.
Endothermic reactions
A chemical reaction in which heat is absorbed is called an endothermic reaction.
It causes a fall in temperature.
Examples:
When nitrogen and oxygen are heated to a temperature of about 3000°C, nitric oxide gas is formed. This is an endothermic reaction.
Answered by Varsha
| 8th Nov, 2017,
10:24: AM
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