define reactantants
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A reactant is a substance that is present at the start of a chemical reaction. The substance(s) to the right of the arrow are called products . A product is a substance that is present at the end of a chemical reaction.
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ᴀɴꜱᴡᴇʀ:-
ᴀ ꜱᴜʙꜱᴛᴀɴᴄᴇ ᴛʜᴀᴛ ɪꜱ ᴘʀᴇꜱᴇɴᴛ ᴀᴛ ᴛʜᴇ ꜱᴛᴀʀᴛ ᴏꜰ ᴀ ᴄʜᴇᴍɪᴄᴀʟ ʀᴇᴀᴄᴛɪᴏɴ.
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