Answer:
Logs in a fire is an example of something burning, also changing its state of form. I think thats chemical change; going from wood to ashes. And charged batteries means they haven't been used yet or they were just charged, resulting in physical change.
Explanation:
I just learned this in science.
I hope this helps!
Answer:
the mass number decreases by 4 and the atomic number decreases by 2
POH = -log[OH-] and pH + pOH = 14
So, all you have to do is take the negative log of 2.3*10^-5 and then subtract that number from 14 to find the pH