Which element is non-metallic and a gas at room temperature? a. Nitrogen (N)
(E) Silicon (Si)
b. Potassium (K)
d. Sodium (Na)

Notrogen(N)

Explanation:

Plz mark me as brilliant

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

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.