Question

what is physical and chemical change​

Answer 1

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• ᴛʜᴇ ᴅɪғғᴇʀᴇɴᴄᴇ ʙᴇᴛᴡᴇᴇɴ ᴀ ᴘʜʏsɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴ ᴀɴᴅ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴ ɪs ᴄᴏᴍᴘᴏsɪᴛɪᴏɴ. ɪɴ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴ, ᴛʜᴇʀᴇ ɪs ᴀ ᴄʜᴀɴɢᴇ ɪɴ ᴛʜᴇ ᴄᴏᴍᴘᴏsɪᴛɪᴏɴ ᴏғ ᴛʜᴇ sᴜʙsᴛᴀɴᴄᴇs ɪɴ ǫᴜᴇsᴛɪᴏɴ; ɪɴ ᴀ ᴘʜʏsɪᴄᴀʟ ᴄʜᴀɴɢᴇ ᴛʜᴇʀᴇ ɪs ᴀ ᴅɪғғᴇʀᴇɴᴄᴇ ɪɴ ᴛʜᴇ ᴀᴘᴘᴇᴀʀᴀɴᴄᴇ, sᴍᴇʟʟ, ᴏʀ sɪᴍᴘʟᴇ ᴅɪsᴘʟᴀʏ ᴏғ ᴀ sᴀᴍᴘʟᴇ ᴏғ ᴍᴀᴛᴛᴇʀ ᴡɪᴛʜᴏᴜᴛ ᴀ ᴄʜᴀɴɢᴇ ɪɴ ᴄᴏᴍᴘᴏsɪᴛɪᴏɴ.

Answer 2

Answer:

Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds.

Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.

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