The Following Data Were Obtained in a Kinetics Study of the Hypothetical

question 20

Multiple Choice

The following data were obtained in a kinetics study of the hypothetical reaction A + B + C ? products. $$\begin{array} { l l l l } { [ \mathrm { A } ] _ { 0 } ( M ) } & { [ \mathrm { B } ] _ { 0 } ( M ) } & { [ \mathrm { C } ] _ { 0 } ( M ) } & \underline { \text { Initial Rate } } \left(10 ^ { - 3 } \underline { M / \mathrm { s } ) } \right. \\0.4 & 0.4 & 0.2 & 160 \\0.2 & 0.4 & 0.4 & 80 \\0.6 & 0.1 & 0.2 & 15 \\0.2 & 0.1 & 0.2 & 5 \\0.2 & 0.2 & 0.4 & 20\end{array}$$
Using the initial-rate method, what is the order of the reaction with respect to A?

• A) zero-order
• B) first-order
• C) second-order
• D) third-order
• E) impossible to tell from the data given

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Definitions:

Chemical Reactions

Processes in which substances interact to form new products, involving changes in molecular structure and energy.

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