Describe the preparation of: A/ 5.00L of 0.05 KMnOu from the solid reagent.

B/ 200 mL of 1% (W/v) aqueous Cuso4 from 0.365 M CuSo4 Solution.

C/ 1.50 L of o.215 M NaOH from the concentrated commercial reagent (5% NaOH (w/w) Sp. gr = 1-526)

D/ 1.5L of a solution that is 12.0 ppm in K+

Question 3(multiple choice worth 4 points) (04.04 lc) what does it mean when an element is reduced? it empties a valance shell, reducing its atomic radius. it gains electrons, reducing its overall charge. it increases electronegativity, reducing its ability to bond. it loses electrons, reducing its electron number.

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.

Which is an example of a reversible physical change?