Question

Give reasons:
a) All decomposition reactions are endothermic reaction.
b) Respiration is exothermic reaction.
c) Magnesium ribbon should be rubbed before burning.​

Answer 1

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a)

ᴅᴇᴄᴏᴍᴘᴏꜱɪᴛɪᴏɴ ʀᴇᴀᴄᴛɪᴏɴꜱ ᴀʀᴇ ᴜꜱᴜᴀʟʟʏ ᴇɴᴅᴏᴛʜᴇʀᴍɪᴄ ʙᴇᴄᴀᴜꜱᴇ ᴛʜᴇʏ ɪɴᴠᴏʟᴠᴇ ʙʀᴇᴀᴋɪɴɢ ᴏꜰ ʙᴏɴᴅꜱ. ʙʀᴇᴀᴋɪɴɢ ʙᴏɴᴅꜱ ʀᴇQᴜɪʀᴇꜱ ᴀɴ ɪɴᴘᴜᴛ ᴏꜰ ᴇɴᴇʀɢʏ, ᴡʜɪʟᴇ ꜰᴏʀᴍɪɴɢ ʙᴏɴᴅꜱ ʀᴇʟᴇᴀꜱᴇꜱ ᴇɴᴇʀɢʏ.

b)

ʀᴇꜱᴘɪʀᴀᴛɪᴏɴ ɪꜱ ᴄᴏɴꜱɪᴅᴇʀᴇᴅ ᴀꜱ ᴇxᴏᴛʜᴇʀᴍɪᴄ ʀᴇᴀᴄᴛɪᴏɴ ʙᴇᴄᴀᴜꜱᴇ ᴇɴᴇʀɢʏ ɪꜱ ʀᴇʟᴇᴀꜱᴇᴅ ɪɴ ᴛʜɪꜱ ᴘʀᴏᴄᴇꜱꜱ. ɢʟᴜᴄᴏꜱᴇ ᴄᴏᴍʙɪɴᴇꜱ ᴡɪᴛʜ ᴏxʏɢᴇɴ ᴘʀᴇꜱᴇɴᴛ ɪɴ ᴏᴜʀ ᴄᴇʟʟꜱ ᴛᴏ ꜰᴏʀᴍ ᴄᴀʀʙᴏɴ ᴅɪᴏxɪᴅᴇ ᴀɴᴅ ᴡᴀᴛᴇʀ ᴀʟᴏɴɢ ᴡɪᴛʜ ᴇɴᴇʀɢʏ.

c)

ʟɪᴋᴇ ʀᴜꜱᴛɪɴɢ ɪɴ ᴄᴀꜱᴇ ᴏꜰ ɪʀᴏɴ, ᴡɪᴛʜ ᴍᴀɢɴᴇꜱɪᴜᴍ, ᴛʜᴇ ᴏxɪᴅᴇ ʟᴀʏᴇʀ ꜰᴏʀᴍꜱ ᴀ ᴡʜɪᴛᴇ ᴄᴏᴀᴛɪɴɢ ᴏɴ ᴛʜᴇ ᴏᴜᴛꜱɪᴅᴇ ᴏꜰ ᴛʜᴇ ᴍᴇᴛᴀʟ ᴛʜᴀᴛ ᴡɪʟʟ ꜱʟᴏᴡ ᴅᴏᴡɴ ᴏʀ ɪɴᴛᴇʀꜰᴇʀᴇ ᴡɪᴛʜ ᴛʜᴇ ʙᴜʀɴɪɴɢ ᴘʀᴏᴄᴇꜱꜱ. ʀᴜʙʙɪɴɢ ᴡɪᴛʜ ꜱᴀɴᴅ ᴘᴀᴘᴇʀ ʜᴇʟᴘꜱ ᴛᴏ ʀᴇᴍᴏᴠᴇ ᴛʜɪꜱ ᴏxɪᴅᴇ ʟᴀʏᴇʀ ᴅᴜᴇ ᴛᴏ ᴡʜɪᴄʜ ʙᴜʀɴɪɴɢ ꜱᴘᴇᴇᴅꜱ ᴜᴘ.

ʜᴏᴘᴇ ɪᴛ ʜᴇʟᴘꜱ ᴜ ᴍᴀᴛᴇ…!!

ᴘʟᴇᴀꜱᴇ ᴍᴀʀᴋ ᴍᴇ ᴀꜱ ʙʀᴀɪɴʟɪᴇꜱᴛ :))

$\sf\pink{Answered \: by \: @vinitakhati85࿐}$

Answer 2

Answer:

Decomposition reactions are usually endothermic because they involve breaking of bonds. Breaking bonds requires an input of energy, while forming bonds releases energy.

Explanation:

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