Which type of reaction is mg + s → mgs?

a. polymerization
b. synthesis
c. replacement
d. decomposition

i think it's synthesis, but idk

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

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.