derive the relation betweencoefficient of linear exapnasion superficial expansion and cubical exapnsion

Will you chech and finish these for me, because i am stumped with them.

Which accounts for an increase in the temperature of a gas that is kept a constant volume

According to valence bond theory, which orbitals overlap in the formation of the bond in hf according to valence bond theory, which orbitals overlap in the formation of the bond in hf 2s on h and 2p on f 1s on h and 2s on f 1s on h and 1p on f 1s on h and 2p on f 1s on h and 3p on f