Which substance can be broken down by chemical means?
1) magnesium
2) manganese
3) mercury
4) methanol

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27 drag each label to the correct location on the image. a particular exosolar system has five planets in total: a, b, c, d, and e. the table lists the orbital periods of these planets in days. planet orbital period (days) a 600 b 80 c 1,000 d 500 e 100 move each planet to its orbit in the system.

Is hydrogen gas a reactant or product