A scientist produces zinc iodine. This is the method used: 1.weight 0.500 g of iodine 2.dissolve the iodine in ethanol
3.add the excess of zinc
4. stir the mixture until there's no further change
5. filter the excess zinc
6. evaporate off the ethanol
explain why the scientist adds excess zinc rather then excess iodine

How much would the freezing point of water decrease if 4 mol of sugar were added to 1 kg of water(k=1.86 c/mol/kg for water and i=1 for sugar

Convert the temperature of dry ice, –77 ∞c, into degrees fahrenheit and kelvin.

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 !