Which term is used to describe a molecule that has a partial positive charge at one end and a partial negative charge at the other end?

Ibeg i need 20. a reaction produces 4.93 l of oxygen, but was supposed to produce 1 mol of oxygen. what is the percent yield?

If you add 10ml of hot water to 10ml of cold water and the change in tempature 8°c calculate how much energy is gained by the cold water

1. list three scientific reasons cockroaches may fly.