Muscles convert chemical energy into
a) light energy.
b) nuclear energy.
c) mechanical energy.
d) electromagnetic energy.

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The answer here would be C, mechanical energy.

Explanation:

Muscles convert chemical energy into mechanical energy. Mechanical energy is associated with the motion and position of an object, and the muscles use the energy to move.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.