I dont know how to do this

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude

Energy defines the different "states" of matter. in no more than 3 sentences, describe the amount of kinetic energy that each of the 3 states of matter possesses and relate that to the atom/molecular motion of each "state".