Mass number 107 and 61 neutrons

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

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride

Which type of intermolecular attractions holds ammonia molecules together with other ammonia molecules?