Fountains often used to cool enclosed courtyards of houses in hot and dry countries. How does a fountain help lower the temperature of a
courtyard? (Hint: evaporation requires energy)

The electromagnetic force acts between what

Calculate the ratio of h+ ions to oh– ions at a ph = 7. find the concentration of h+ ions to oh– ions listed in table b of your student guide. then divide the h+ concentration by the oh– concentration. record this calculated ratio in table a of your student guide. compare your approximated and calculated ratios of h+ ions to oh– ions at a ph = 7. are they the same? why or why not? record your comparison in table a. what is the concentration of h+ ions at a ph = 7? mol/l what is the concentration of oh– ions at a ph = 7? mol/l what is the ratio of h+ ions to oh– ions at a ph = 7? : 1

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