In the following equation how many atoms are in the reactants? EHCI + Ca(OH)2 --> CaCl2 + 2H2O

2
3
5
9

Agas can holds 2.0 gal of gasoline. what is this quantity in cubic centimeters?

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

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?