A chemist is using a solution of HNO3 that has a pH of 3.75.
What is the pOH of the solution?
What is [OH-] for the solution?
5.62
x 10^M
DONE
n = 7-11

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

Can someone me with questions 12 and 13 plz.

How have the greenhouse gasses increased from the year 2000 to 2018