Question

under which situations can an amorphous substance change to crystalline form?

Answer 1

(i) On heating they may become crystalline at certain temperature. (ii) They may become crystalline on keeping for long time. -

Answer 2

$\huge\boxed{\underline{\mathcal{\red{❥A}\green{N}\pink{S}\orange{W}\blue{E}\purple{R}}}}$

ᴀɴ ᴀᴍᴏʀᴘʜᴏᴜs sᴏʟɪᴅ ᴏɴ ʜᴇᴀᴛɪɴɢ ᴀᴛ sᴏᴍᴇ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ᴍᴀʏ ʙᴇᴄᴏᴍᴇᴄʀʏsᴛᴀʟʟɪɴᴇ. sʟᴏᴡ ʜᴇᴀᴛɪɴɢ ᴀɴᴅ ᴄᴏᴏʟɪɴɢ ᴏᴠᴇʀ ᴀ ʟᴏɴɢ ᴘᴇʀɪᴏᴅ ᴍᴀᴋᴇs ᴀɴᴀᴍᴏʀᴘʜᴏᴜs sᴏʟɪᴅ ᴀᴄǫᴜɪʀᴇs sᴏᴍᴇᴄʀʏsᴛᴀʟʟɪɴᴇ ᴄʜᴀʀᴀᴄᴛᴇʀ.