Which of the following is required for a reaction to occur? a. energy
b. collisions
c. activation energy
d. all of the above

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)

Label a-f based on the table using c for concentrated and d for dilute

What shape would a molecule with two bound groups and two lone pairs have?