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22 January, 21:46

Which of these never changes during a chemical change?

a. the arranhement of the atoms

b. the total number of molecules

c. the total number of atoms

d. the color of the reactants

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Answers (1)
  1. 22 January, 21:53
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    B is not correct because new molecules are formed so numbers can change. D isn't correct because the color often changes, for example metallic iron and clear oxygen form red rust. The arrangement of the atoms changes, too so a isn't correct. C is cotrect
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