Which statement describes magnetic field lines at the north and south pole of a bar magnet?

a. field lines begin near the magnet's south pole and extend toward its north pole
b. field lines begin near both the magnet's north and south poles and meet in the middle
c. field lines begin near the center of the magnet and extend toward the north and south poles
d. field lines begin near the megnet's north pole and extend toward it's south pole

What is the difference between skimming and absorbing methods of the oil removal

Challenge question: this question is worth 6 points. as you saw in problem 9 we can have species bound to a central metal ion. these species are called ligands. in the past we have assumed all the d orbitals in some species are degenerate; however, they often are not. sometimes the ligands bound to a central metal cation can split the d orbitals. that is, some of the d orbitals will be at a lower energy state than others. ligands that have the ability to cause this splitting are called strong field ligands, cnâ’ is an example of these. if this splitting in the d orbitals is great enough electrons will fill low lying orbitals, pairing with other electrons in a given orbital, before filling higher energy orbitals. in question 7 we had fe2+, furthermore we found that there were a certain number (non-zero) of unpaired electrons. consider now fe(cn)6 4â’: here we also have fe2+, but in this case all the electrons are paired, yielding a diamagnetic species. how can you explain this?

What is the chemical name of the compound k2so4?