[问答题]
A student adds excess zi
(gi4r+h;il:8 v0wf qdhf +vncnc pe
v;cv6 p n)7zv +t1bnjfllets to
0.100$mol dm^{-3}$$HNO_3$in a beaker. The student tracks the reaction's progress by monitoring the mixture's pH in the beaker over time. The data is collected and graphed. The results are shown below:
$Zn(s)$+$2HNO_3(aq)$→$Zn(NO_3)_2(aq)$+$H_2(g)$
2.1.The change of pH over time is related to the disappearance of the$HNO_3$.If the rate of disappearance of$HNO_3$ is determined to be$5.53\times 10^{-3}$$mol dm^{-3}s^{-1}$,what is the rate of appearance of $Zn^2$+$ions$?
2.
Propose an observation of a different substance in this chemical reaction that could be used to determine the rate of the reaction. Describe both the substance observed and the measurement taken.
3.1.On the energy profile diagram below, label lines$A$and$B$. Then, state if the reaction is endothermic or exothermic and justify your response.
2.
If the energy profile diagram above represents the reaction with a catalyst, sketch how the curve would change if the reaction proceeded without a catalyst.
