For each of the scenarios, identify the order with respect to the reactant, A. A⟶products The half‑life of A increases as the initial concentration of A decreases. order: A three‑fold increase in the initial concentration of A leads to a nine‑fold increase in the initial rate. order: A three‑fold increase in the initial concentration of A leads to a 1.73‑fold increase in the initial rate. order: The time required for [A] to decrease from [A]0 to [A]0/2 is equal to the time required for [A] to decrease from [A]0/2 to [A]0/4. order: The rate of decrease of [A] is a constant. order:

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.

Explain why pure hydrogen cyanide does not conduct electricity, but become a conductor when it is dissolved in water? (at room temp, pure hcn exists as a volatile liquid)

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %