How can atoms make up all of the substances around you?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?

In water, a strong acid will break down into its component parts. a. completely b. partly c. never in water, a weak base will break down into its component parts. a. completely b. partly c. never