What is the angle between two of the phosphorus-chlorine bonds in the phosphorus tetrachloryl?

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Which characteristics can be used to differentiate star systems? check all that apply.