If the enthalpy change for a chemical reaction is positive, is the reaction exothermic or endothermic? Explain your answer.

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal