Which of the following is an ozone-depleting substance?

chlorofluorocarbons

hydrofluorocarbons
polychlorinated biphenyls

According to le chatelier’s principle, a system in chemical equilibrium responds to stress by shifting the equilibrium in a direction that reduces the stress. normalizes the stress. increases the stress. changes the stress.

What does the symbol (–hfus) indicate in a phase change?

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds