Which of the following correctly represents two ions and the ionic compound that would form? A. Pb4 + , O2- , Pb2O4 B. Sc3+ , S2- , Sc2S3 C. Ba2 + , O2- , BaO2 D. Ca2- , F- , Ca2F

Which of the following describes something an engineer would probably do first when developing new technology meant to reduce ocean pollution? o a. evaluate the benefits and challenges of using certain chemicals to purify water. o b. research new scientific findings in regard to ocean cleanup. o c. identify the need to reduce ocean pollution. o d. research what has been done in the past to clean up oceanic oil residue.

What is the most useful equation for electric power?

Consider a hydrogen atom in the ground state. what is the energy of its electron? =e= jj now consider an excited‑state hydrogen atom. what is the energy of the electron in the =5n=5 level? =e5= j