Using relative e values determine which of the following reactions are electrically possible. mg(s) + br2(l) ——> mgbr2 this equation shows that mg is : oxidized or reduced? this equation shows that br2 is : oxidized or reduced? can this redox reaction take place?

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest