Brainliesttt !me : )

why is the reaction between potassium (k) and chlorine (cl) considered an oxidation-reduction reaction?

k(s) + cl2(g) → 2kcl(s)

chlorine reduces in size when it reacts with potassium.
chlorine takes electrons from potassium in the reaction.
potassium reduces in strength when it bonds with chlorine.
potassium takes chlorine's place in the reaction.

Esign techniques and materials that reduce the negative environmental impact of a structure are referred to as

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc

Lab reagent, hypothesis test. a reference solution used as a lab reagent is purported to have a concentration of 5 mg/dl. six samples are taken from this solution and the following concentrations are recorded: (5.32, 4.88, 5.10, 4.73, 5.15, 4.75) mg/dl. these six measurements are assumed to be an srs of all possible measurements from solution. they are also assumed to have a standard deviation of 0.2, a normal distributin, and a mean concentration equal to the true concentration of the solution. carry out a significance test to determine whether these six measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dl.