Would it be easier or more difficult (compared to zinc) to recover silver from solution?

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

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?