Which half-reaction correctly describes an oxidation?
ca(s) + 2e" __ca2+ (aq)
br2 + 2e —_2br"
na+ (aq) —> na(s)+e
cr(s)—> cr3+ (aq) + 3e

What is the composition, in atom percent, of an alloy that consists of 4.5 wt% pb and 95.5 wt% sn? the atomic weights for pb and sn are 207.19 g/mol and 118.71 g/mol, respectively.(a) 2.6 at% pb and 97.4 at% sn(b) 7.6 at% pb and 92.4 at% sn(c)97.4 at% pb and 2.6 at% sn(d) 92.4 at% pb and 7.6 at% sn

50 pts plz what is the physical state of matter of baking soda.

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining