14. Chemical reactions can occur when molecules collide. What happens when molecules collide but no chemical reaction takes place?
A. Atoms in the molecules are rearranged.
B The molecules change their shape.
C. The molecules bounce off each other.
D. The pressure in the container increases.

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Explanation:

The more molecules present, the more collisions will happen.

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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.