A student places a strip of zinc metal into a sealed
CHEMISTRY · Single correct · AP · Chemistry · Chemical Reactions · Chemical Reactions
Problem
A student places a strip of zinc metal into a sealed, colorless hydrochloric acid solution contained in a flask connected to an empty balloon. The system remains closed for the entire experiment. Which observation would NOT be expected if a chemical reaction occurs under these conditions?
(a) The balloon partially inflates over several minutes.
(b) The temperature of the solution increases slightly as the reaction proceeds.
(c) The total mass of the sealed apparatus decreases by 0.50g after the reaction appears complete.
(d) The pH of the solution gradually increases during the experiment.