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Biology 7 Online
OpenStudy (anonymous):

Chemical reactions cause changes in: atoms molecules physical properties *u can have more than one option...

thomaster (thomaster):

This question belongs in the chemistry section. Atoms can't be changed in chemical reactions. Molecules however can change. The physical properties (like colour) can also be changed by chemical reactions.

OpenStudy (anonymous):

You can have more than 1 option.

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