In a chemical reaction occurring in an open beaker, the reactants have a mass of 10g and contain 1000j or energy. the products in the beaker contain a mass of 5g and 500j of energy. which best explains the difference in energy and mass as reactants are converted to products.

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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 !

In the experiment you asked to react hydrochloric acid and with sodium hydroxide. when measuring the volume of the reactants, which instrument would give the greatest precision.