I NEED HELP PLEASE, THANKS :)
Describe each of the following compounds with as many of these words as apply: atom, molecule, pure substance, homogeneous mixture, heterogeneous mixture, element, solution.

-Table salt (sodium chloride or NaCl)
-Blue Cheese salad dressing
-Iron (Fe)

Which best describes how johannes kepler developed his laws of planetary motion

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

Need what is special about water as a compound? how does water regulate climate? what drives water evaporation?   why is the water vapor fresh water when it rises from the ocean? why might freshwater in the form of snow take longer to enter the water cycle again than liquid precipitation?   what is an aquifer? what role do people play in the water cycle? plz just answer as many as you can ! thx if you !