Le dioxyde de carbone rejeté par les poissons se dissout dans l'eau et se transforme en acide carbonique. Cette dissolution fait-elle baisser ou augmenter le pH de l'eau de l'aquarium? Pourquoi?

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

Calculate the number of molecules present in 0.750 mol of mgo.

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at