1. Do all substances change from solid to liquid and liquid to gas on heating? Expl.
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ɴᴏ, ᴀʟʟ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ ᴅᴏɴ'ᴛ ᴄʜᴀɴɢᴇ ꜰʀᴏᴍ ꜱᴏʟɪᴅ ᴛᴏ ʟɪQᴜɪᴅ ᴀɴᴅ ᴛʜᴇɴ ᴛᴏ ɢᴀꜱ ᴏɴ ʜᴇᴀᴛɪɴɢ. ꜱᴏᴍᴇ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ ᴅɪʀᴇᴄᴛʟʏ ᴄʜᴀɴɢᴇ ɪɴᴛᴏ ɢᴀꜱᴇᴏᴜꜱ ꜱᴛᴀᴛᴇ ᴡʜᴇɴ ɪᴛ ɪꜱ ʜᴇᴀᴛᴇᴅ. ᴛʜᴇʏ ᴀʀᴇ ᴄᴀʟʟᴇᴅ ꜱᴜʙʟɪᴍᴇ. ꜰᴏʀ ᴇxᴀᴍᴘʟᴇ: ᴄᴀᴍᴘʜᴏʀ
ᴜꜱᴜᴀʟʟʏ ᴡʜᴇɴ ꜱᴏʟɪᴅꜱ ᴀʀᴇ ʜᴇᴀᴛᴇᴅ ᴛʜᴇʏ ᴍᴇʟᴛ ᴀɴᴅ ʙᴇᴄᴏᴍᴇꜱ ʟɪQᴜɪᴅ. ᴛʜᴇɴ ᴏɴ ꜰᴜʀᴛʜᴇʀ ʜᴇᴀᴛɪɴɢ ᴛʜᴇ ʟɪQᴜɪᴅ ʙᴏɪʟꜱ ᴛᴏ ꜰᴏʀᴍ ᴀ ɢᴀꜱ. ᴡʜᴇɴ ᴡᴇ ᴋᴇᴇᴘ ᴀ ᴘɪᴇᴄᴇ ᴏꜰ ɪᴄᴇ ɪɴ ᴀ ᴅɪꜱʜ ɪᴛ ᴍᴇʟᴛꜱ ᴀɴᴅ ᴛʜᴇ ᴡᴀᴛᴇʀ ꜱᴏ ꜰᴏʀᴍᴇᴅ ᴇᴠᴀᴘᴏʀᴀᴛᴇꜱ ᴀꜰᴛᴇʀ ꜱᴏᴍᴇᴛɪᴍᴇ. ʜᴏᴡᴇᴠᴇʀ ᴛʜᴇʀᴇ ᴀʀᴇ ꜱᴏᴍᴇ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ ᴡʜɪᴄʜ ᴏɴ ʜᴇᴀᴛɪɴɢ ᴅɪʀᴇᴄᴛʟʏ ᴛᴜʀɴ ɪɴᴛᴏ ɢᴀꜱᴇꜱ ꜰʀᴏᴍ ꜱᴏʟɪᴅꜱ. ᴄᴀᴍᴘʜᴏʀ ɪᴏᴅɪɴᴇ ᴄʀʏꜱᴛᴀʟꜱ ᴀɴᴅ ꜱᴏʟɪᴅ ᴄᴀʀʙᴏɴ ᴅɪᴏxɪᴅᴇ ᴀʀᴇ ꜱᴜᴄʜ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ. ꜱᴜᴄʜ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ ᴀʀᴇ ᴄᴀʟʟᴇᴅ ꜱᴜʙʟɪᴍᴀᴛᴏʀʏ ꜱᴜʙꜱᴛᴀɴᴄᴇꜱ ᴀɴᴅ ᴛʜɪꜱ ᴘʀᴏᴄᴇꜱꜱ ᴏꜰ ᴄᴏɴᴠᴇʀꜱɪᴏɴ ɪꜱ ᴋɴᴏᴡɴ ᴀꜱ ꜱᴜʙʟɪᴍᴀᴛɪᴏɴ.
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