I still think from those examples that it is giving you a range for the given types of transformations. I.e. the idea is this:
Physical changes (such as freezing a solid):
Energy Released 10-100 kJ/mol (or would that be 1-100 kj/mol?)
Chemical changes (such as combining two elements to form a compound):
Energy Released 100-1,000 kJ/mol
Nuclear changes (such as converting two hydrogen atoms into helium):
Energy Released 1,000,000-1,000,000,000 kJ/mol
You can see that physical changes are weaker than chemical changes which are both far weaker than nuclear changes. The individual reactions are not important to the concept, they are just specific examples of what each change would be (like what I placed in parenthesis above).
Hope this helped.