Physical change does not produce a nee substance true or false

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True

TruePhysical change – A change in the size, shape, color, or state of matter of a substance. No new substance is produced.

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.