The top picture shows a bar magnet with the poles labeled N and S. The magnet was cut into two pieces-one short plece and one long plece. How
should the cut end of the short piece of magnet be labeled?
Circle the answer that best matches your thinking.
A. N
B. S
C. No label-it no longer has a N or s pole on the cut end.
Explain your thinking. What rule or reasoning did you use to
decide how to label the cut end of the short piece of magnet?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.