How Much How Fast & How Far E.2 Rate of Chemical Change (id: 44489ca10)

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

[单选题]

For an iodine clock reaction, the following experimental data was collected with respect to one of the reactants, the iodide ion,$I^-$

Trial	Concentration of $I^-$($mol dm^{-3}$)	Rate of reaction ($s^{-1}$)
1	0.2	0.40
2	0.1	0.19
3	0.3	0.61

What is the most likely order of the reaction with respect to iodide $I^-$?

A. 0.5
B. 1
C. 1.5
D. 2


参考答案:  B


本题详细解析:
B

Using trials 1 and 2, as the concentration of $\mathrm{I}{\phantom{}}^{-}$$I^-$doubles, the rate also doubles. Rate and [$I^-$]are therefore, directly proportional with an order of 1.

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