Question

What does one mean by exothermic and endothermic reaction give an example?

Answer 1

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✴️Exothermic reactions

=> These are those reactions in which after reaction heat is evolved are known as exothermic reactions.

Example : CaO + CO2 --------> CaCO3 + heat

✴️Endothermic reactions

=> these are those reactions in which heat is involved during reaction :

Example : 2AgBr ----------> 2Ag + Br2

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Answer 2

ᴀɴsᴡᴇʀ-

ᴛʜᴇ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴs ᴡʜɪᴄʜ ᴏᴄᴄᴜʀ ᴡɪᴛʜ ᴛʜᴇ ᴇᴠᴏʟᴜᴛɪᴏɴ ᴏғ ʜᴇᴀᴛ ᴀʀᴇ ᴄᴀʟʟᴇᴅ ᴇxᴏᴛʜᴇʀᴍɪᴄ ʀᴇᴀᴄᴛɪᴏɴs. ғᴏʀ ᴇxᴀᴍᴘʟᴇ, ʜᴇᴀᴛ ʜᴇᴀᴛ ᴛʜᴇ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴs ᴡʜɪᴄʜ ᴏᴄᴄᴜʀ ᴡɪᴛʜ ᴛʜᴇ ᴀʙsᴏʀᴘᴛɪᴏɴ ᴏғ ʜᴇᴀᴛ ᴀʀᴇ ᴄᴀʟʟᴇᴅ ᴇɴᴅᴏᴛʜᴇʀᴍɪᴄ ʀᴇᴀᴄᴛɪᴏɴs.