Is PCl3 ionic or covalent?

Explain that newton first law, second law and third law of motion?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Water undergoes a large change in density at 0 ∘ c as it freezes to form ice. calculate the percent change in density that occurs when liquid water freezes to ice at 0 ∘ c given that