a mixture of gases a2 a 2 and b2 b 2 are introduced to a slender metal cylinder that has one end closed and the other fitted with a piston that makes a gas-tight seal so that the gases are a closed system. the cylinder is submerged in a large beaker of water whose temperature is 25∘c ∘ c , and a spark is used to trigger a reaction in the cylinder. at the completion of the reaction, the piston has moved downward, and the temperature of the water bath has increased to 28∘c ∘ c . if we define the system as the gases inside the cylinder, which of the following best describes the signs of q q , w w , and δe δ e for this reaction?