Guys can anyone me with 4 & 5? ?

Which articulations allow for greatest range of motion?

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

Which of the following bonds would be most polar? a. c-i b. c-br c. c-cl d. c-f e. c-o