IB Chemistry HL 2.2.9 Hl Rate Equations Questions

Use real HL exam questions to infer reaction orders from concentration changes and write or test the complete rate equation.

Exam points

Infer the order with respect to each reactant from concentration-change experiments before constructing the complete rate equation.
Write the complete rate equation using the rate constant and experimentally supported concentration powers.
Use a stated mechanism or concentration data to test, explain or quantitatively apply the rate equation, including predicted rate changes.

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Study 2.2.9 (HL)—Rate equations conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

[Maximum number: 2]

Organic compounds have many industrial applications.

(a)

1-Bromobutane reacts with aqueous sodium hydroxide, NaOH(aq), to form butan-1-ol.

[ 2 ]

(i)

Deduce the rate equation for this reaction.

[ 1 ]

$\text { «rate }=» k\left[\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}\right]\left[\mathrm{OH}^{-}\right] \vee$

«rate => $k\left[\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{Br}\right]$ if $S_{N} 1$ named in (d)(l).

Marking guidance:

Accept NaOH for $\mathrm{OH}^{-}$

(ii)

Predict, giving a reason, the quantitative effect of doubling the concentration of NaOH(aq) on the reaction rate. Assume that all other conditions remain unchanged.

[ 1 ]

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IB Chemistry HL 2.2.9 Hl Rate Equations Questions question 1

Question (a)

Question (i)

Question (ii)