Classify as element, compound, or mixture: a. Lump of copper, Cu b. gravel, and sand
c. stick of margarine (water + oil) d. lump of sugar C12, H22, O11
e. an oil slick on water f. ozone, O3

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)

At stp, what is the volume of 1 mole of co2?

V1t2 = v2t1 is an expression of who’s law