when there is no change in the chemical composition of the substance(which change
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ɪɴ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴄʜᴀɴɢᴇ, ᴛʜᴇ ᴍᴏʟᴇᴄᴜʟᴇs ɪɴ ᴛʜᴇ ʀᴇᴀᴄᴛᴀɴᴛs ɪɴᴛᴇʀᴀᴄᴛ ᴛᴏ ғᴏʀᴍ ɴᴇᴡ sᴜʙsᴛᴀɴᴄᴇs. ɪɴ ᴀ ᴘʜʏsɪᴄᴀʟ ᴄʜᴀɴɢᴇ, ʟɪᴋᴇ ᴀ sᴛᴀᴛᴇ ᴄʜᴀɴɢᴇ ᴏʀ ᴅɪssᴏʟᴠɪɴɢ, ɴᴏ ɴᴇᴡ sᴜʙsᴛᴀɴᴄᴇ ɪs ғᴏʀᴍᴇᴅ. ᴇxᴘʟᴀɪɴ ᴛʜᴀᴛ ᴀɴᴏᴛʜᴇʀ ᴡᴀʏ ᴛᴏ sᴀʏ ᴛʜᴀᴛ ɴᴏ ᴀᴛᴏᴍs ᴀʀᴇ ᴄʀᴇᴀᴛᴇᴅ ᴏʀ ᴅᴇsᴛʀᴏʏᴇᴅ ɪɴ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴ ɪs ᴛᴏ sᴀʏ, “ᴍᴀss ɪs ᴄᴏɴsᴇʀᴠᴇᴅ.”
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change in which a substance changes its physical properties like appearance, texture, colour, odour, melting points, boiling points, density, solubility, polarity etc... are called physical changes.
Physical properties can be observed or measured without changing the composition of matter. They are used to observe and describe matter.
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