Which of the following processes is exothermic?
a. the reaction associated with dh°f for an ionic compound the ionization of a lithium atom.
b. the sublimation of dry ice (co2(s))
c. the breaking of a cl-cl bond
d. all of the above processes are exothermic

What does a numerical subscript following an element in a chemical formula mean?

How many atoms or molecules are there in a mole of a substance?

Which question could be best answered using the process of scientific inquiry? do different plates have different rock compositions? why did it take so long to develop the theory of plate tectonics? what are different cultural myths caused by plate tectonics? do plates move intentionally to cause volcanic eruptions?