A doctor orders a blood sample from a child to test for traces of lead in the blood. Which of the following concentration units would best meet this need?
O grams per liter
O molality
O percentage by mass
O parts per million

These traits describe either a chemical or a nuclear reaction. which statements describe a nuclear reaction? check all that apply. involves the loss, gain, or sharing of electrons may involve a change in total mass involve relatively low energy changes occur outside the nucleus involve very high-energy changes involve changes in nuclides when decay occurs