Question

wand
5. When
candle burns, both physical
chemical changes
occur.
explain.​

Answer 1

When a candle burns, both physical & chemical changes occur. On heating, candle wax melts and form liquid wax. It is a physical change. Since it again turns into solid wax on cooling. This is a reversible change. When a candle is burnt in air, the mass of the product is increased due to atmospheric oxygen which show a that it is a chemical change.

Source: Toppr

Answer 2

$\huge\rm\underline{\underline{\purple{Qᴜᴇsᴛɪᴏɴ:-}}}$

╰❥ Wʜᴇɴ ᴀ ᴄᴀɴᴅʟᴇ ʙᴜʀɴs ʙᴏᴛʜ ᴘʜʏsɪᴄᴀʟ ᴀɴᴅ ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇs ᴏᴄᴄᴜʀ. Exᴘʟᴀɪɴ.

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$\huge\rm\underline{\underline{\blue{Aɴsᴡᴇʀ:-}}}$

╰❥ Iᴛ ɪs ᴛʀᴜᴇ ᴛʜᴀᴛ ᴡʜᴇɴ ᴀ ᴄᴀɴᴅʟᴇ ʙᴜʀɴs, ʙᴏᴛʜ ᴘʜʏsɪᴄᴀʟ ᴀɴᴅ ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇs ᴏᴄᴄᴜʀ. Iɴɪᴛɪᴀʟʟʏ ᴄᴀɴᴅʟᴇ ʙᴜʀɴs ᴘʀᴏᴅᴜᴄɪɴɢ ʜᴇᴀᴛ ᴀɴᴅ ʟɪɢʜᴛ. Iᴛ ɪs ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇ ʙᴇᴄᴀᴜsᴇ ᴄᴀɴᴅʟᴇ ʙᴜʀɴs ᴡɪᴛʜ ᴛʜᴇ ғᴏʀᴍᴀᴛɪᴏɴ ᴏғ ɢᴀsᴇs. Dᴜᴇ ᴛᴏ ᴛʜᴇ ʜᴇᴀᴛ ᴘʀᴏᴅᴜᴄᴇᴅ, sᴏᴍᴇ ᴄᴀɴᴅʟᴇs sɪᴍᴜʟᴛᴀɴᴇᴏᴜsʟʏ ᴍᴇʟᴛs. Tʜɪs ɪs ᴀ ᴘʜʏsɪᴄᴀʟ ᴄʜᴀɴɢᴇ ᴀs ᴛʜᴇ ᴍᴏʟᴛᴇɴ ᴄᴀɴᴅʟᴇ ᴡᴀx ʙᴇʜᴀᴠᴇs ʟɪᴋᴇ ᴏʀɪɢɪɴᴀʟ ᴄᴀɴᴅʟᴇ.

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