In the following concentration cell, cu(s) | cu2+(aq, x m) || cu2+(aq), 1.0m) | cu(s)the vollowing absolute ecell values were measured for different concentrations of cu2+ (aq) (x): [x] m ecell va. 1.0*10^0 0.000b. 1.0*10^-1 0.0271c. 1.0*10^-2 0.0542d. 1.0*10^-3 0.0812e. 1.0*10^-4 0.1083a) using these data calculate the average temperature of these measurements. b) the same cell was then used to measure a cell voltage of ecell = 0.0677v for an unknown concentration of cu2+ (aq) in solution at this temperature. from an appropriate plot, determine this unknown concentration

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

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.)

What are the two largest greenhouse gases