What do elements in the first two columns of the periodic table have in common?
a.) they have two valence electrons
b.) they tend to lose electrons to gain stability
c.) they react strongly with the alkali metals
d.) they do not react with halogens

If a reaction has g of -136kj at 110°c, will it be spontaneous at this temperature (110°c)? yes or no

What is the formula for calcium iodide

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.