Calculate the [OH–], pH, and pOH of each of the following solutions at 25°C. Identify each solution as neutral, acidic, or basic. 1) [H+] = 8.3 × 10^–16M
2) [H+] = 5.4 × 10^–5M

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Idon't know hope someone you