What is a property? Why are properties important? put it in comments please and thank you

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.

When can a hypothesis be elevated to the status of a theory? a) when it is validated by an experiment b) when data gathered from an experiment precisely fits predictions c) when it can be proved to be true d) when it meets the test of repeated experimentation