Which diagram models the particle spacing when a solid changes to a gas?

D.

Explanation:

On the diagram, we see a full box and all the circles (particles) are touching each other.

Gases are the opposite, a diagram of gas would be particles very far from each other and not many in a diagram

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.