Question

b) What are fules ? What happen
when charcol is burnt in
air ?​

Answer 1

Answer:

We find that charcoal burns in air. We know that coal, too, burns in air producing carbon dioxide, heat and light. We were told that food is a fuel for our body. A chemical process in which a substance reacts with oxygen to give off heat is called combustion.

Answer 2

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➬ᴀ ғᴜᴇʟ ɪs ᴀɴʏ ᴍᴀᴛᴇʀɪᴀʟ ᴛʜᴀᴛ ᴄᴀɴ ʙᴇ ᴍᴀᴅᴇ ᴛᴏ ʀᴇᴀᴄᴛ ᴡɪᴛʜ ᴏᴛʜᴇʀ sᴜʙsᴛᴀɴᴄᴇs sᴏ ᴛʜᴀᴛ ɪᴛ ʀᴇʟᴇᴀsᴇs ᴇɴᴇʀɢʏ ᴀs ʜᴇᴀᴛ ᴇɴᴇʀɢʏ ᴏʀ ᴛᴏ ʙᴇ ᴜsᴇᴅ ғᴏʀ ᴡᴏʀᴋ. 

➬ᴄʜᴀʀᴄᴏᴀʟ ʀᴇᴀᴄᴛs ᴡɪᴛʜ ᴏxʏɢᴇɴ ᴏғ ᴛʜᴇ ᴀɪʀ ᴀᴛ ᴀ ɢʟᴏᴡɪɴɢ ʀᴇᴅ ʜᴇᴀᴛ ᴛᴏ ғᴏʀᴍ ᴄᴏʟᴏᴜʀʟᴇssᴄᴀʀʙᴏɴ ᴍᴏɴᴏxɪᴅᴇ ɢᴀs, ᴡʜɪᴄʜ ᴛʜᴇɴ ʙᴜʀɴsᴡɪᴛʜ ᴀ ʙʟᴜᴇ ғʟᴀᴍᴇ ᴡɪᴛʜ ᴍᴏʀᴇ ᴏxʏɢᴇɴ ғʀᴏᴍ ᴛʜᴇ ᴀɪʀ ᴛᴏ ᴘʀᴏᴅᴜᴄᴇ ᴄᴀʀʙᴏɴ ᴅɪᴏxɪᴅᴇ ɢᴀs.