Question

Give one characteristic, why compounds are called pure substance?
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Answer 1

Pure compounds and elements differ from mixtures in one key way: the substances in a pure compound are held together by chemical bonds. These chemical bonds cannot be broken. Since they contain a single substance only, elements cannot be decomposed by ordinary chemical methods, such as the application of heat, either.

Answer 2

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• ᴘᴜʀᴇ ᴄᴏᴍᴘᴏᴜɴᴅs ᴀɴᴅ ᴇʟᴇᴍᴇɴᴛs ᴅɪғғᴇʀ ғʀᴏᴍ ᴍɪxᴛᴜʀᴇs ɪɴ ᴏɴᴇ ᴋᴇʏ ᴡᴀʏ: ᴛʜᴇ sᴜʙsᴛᴀɴᴄᴇs ɪɴ ᴀ ᴘᴜʀᴇ ᴄᴏᴍᴘᴏᴜɴᴅ ᴀʀᴇ ʜᴇʟᴅ ᴛᴏɢᴇᴛʜᴇʀ ʙʏ ᴄʜᴇᴍɪᴄᴀʟ ʙᴏɴᴅs. ᴛʜᴇsᴇ ᴄʜᴇᴍɪᴄᴀʟ ʙᴏɴᴅs ᴄᴀɴɴᴏᴛ ʙᴇ ʙʀᴏᴋᴇɴ. sɪɴᴄᴇ ᴛʜᴇʏ ᴄᴏɴᴛᴀɪɴ ᴀ sɪɴɢʟᴇ sᴜʙsᴛᴀɴᴄᴇ ᴏɴʟʏ, ᴇʟᴇᴍᴇɴᴛs ᴄᴀɴɴᴏᴛ ʙᴇ ᴅᴇᴄᴏᴍᴘᴏsᴇᴅ ʙʏ ᴏʀᴅɪɴᴀʀʏ ᴄʜᴇᴍɪᴄᴀʟ ᴍᴇᴛʜᴏᴅs, sᴜᴄʜ ᴀs ᴛʜᴇ ᴀᴘᴘʟɪᴄᴀᴛɪᴏɴ ᴏғ ʜᴇᴀᴛ, ᴇɪᴛʜᴇʀ.