Achunk of limestone, which is calcium carbonate, reacts with acid. how might you increase the rate of this reaction?

remove any catalyst?
crush the limestone?
decrease the temperature?
add water to the acid?

Crush the limestone... it would give more area for the acid to react

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.