Which phrase describes a homogeneous catalyst?
a. present in many biological reactions
b. used to detoxify exhaust gas
c. exists in a different phase than the reactants
d. work best in high temperatures

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)

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Amixture with the same composition throughout is!