Use Hess’s Law and solve for the enthalpy change of the following rxn: 12 P(s) + 10 Fe2O3 (s) -> 3 P4O10 (s) + 20 Fe (s)

2 C2H6 (l) + 7 O2 (g) -> 4 CO2 (g) + 6H2O (g)

Which process transfers heat from inside earth to its surface? convection currents in mantle pulling away of tectonic plates drawing in of tectonic plates convection currents in crust

What is a difference between a mixture of elements and a mixture of compounds

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 !