Is the equation C2H4 —> 2C + 2H2 + 52.3 exothermic or endothermic?

100mg magnesium reacts with 20ml of 1.0m hcl

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)

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?