Can you please help me

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

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.

The diagrams to the right show the distribution and arrangement of gas particles in two different containers. according to kinetic-molecular theory, which of the following statements is true? check all that apply. if the temperatures of both containers are equal, container a has greater pressure than container b. if the volume of container a decreased, its pressure would decrease. if the pressure in both containers is equal, container a has a lower temperature than container b.