The ion MnO−4 is often used to analyze for the Fe2+ content of an aqueous solution by using the (unbalanced) reaction MnO−4 +Fe2+ → Fe3+ + Mn2+ in aci

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)

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Element before carbon on the periodic table