A student dissolves ethanol (C2H5OH) in distilled water. In another container, he dissolves CaCl2, in distilled water. Will either of the solutions conduct electricity? If so which one? Plz Help!

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)

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?