How Much How Fast & How Far E.2 Rate of Chemical Change (id: 66132b1c6)

本题目来源于试卷: How Much How Fast & How Far E.2 Rate of Chemical Change，类别为 IB化学

[问答题]
A student adds excess zinxc;)9 d qtibi/h8p;4,e xgpg gc pelle220 z nycov69hx e(iyrts to0.100$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.
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