7. Suppose a student who took CHM 11500 last semester told you that the molar absorptivity of Fe(phen)3 2 is equal to 1.1 x 104 . Describe why you would still need to construct a calibration plot in order to determine the concentration of Fe2 in an unknown solution.

7is b8 is d9 is c10 is a11 is d

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Hope the image of the frequency formula