Which of these chemical equations does not describe a redox reaction?
3NO2(g) + H2O(1) ► 2HNO3(aq) + NO(g)
->
2KNO3(s) → 2KNO2(s) + O2(8)
2LiOH(aq) + H2SO4(aq) → Li2SO4(aq) + 2H2O(1)
2Na(s) + 2H2O(1) ► 2NaOH(aq) + H2(8)
O2KBr(aq) + Cl2(8) ► 2KCl(aq) + Brz(1)

Which statement is best described as a atom

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 !

What is a number added in front of a formula in order to balance the equation