Question

how to define chemical change. don't spam​

Answer 1

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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Answer 2

Answer:

ᴛʜᴇ ᴄʜᴀɴɢᴇ ɪɴ ᴡʜɪᴄʜ ɴᴇᴡ sᴜʙsᴛᴀɴᴄᴇs ᴀʀᴇ ғᴏʀᴍᴇᴅ