What can be used in the absence of enthalpies of formation to calculate approximate enthalpy changes?

In salt water solution, the salt is the blank

Scientist think that animals with remarkably similar embryo development probably shared a common ancestor

Examine the false statement. compounds are the smallest unit of an element that occur most commonly in nature. select the rewording of the statement that is true. a: atoms are the smallest unit of an element that commonly occur in nature. b: molecules are the smallest unit of an element or compound that commonly occur in nature. c: molecules are the smallest unit of a compound that occur on the periodic table. d: compounds are the smallest unit of an element that occur on the periodic table