At least how many elements are needed to create a compound

The clouds are grey and ground is wet. a quantitative b qualitative

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?