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B.Sc Chemistry Chemical Kinetics — practice questions

Explore 28 free Chemical Kinetics questions in B.Sc Chemistry Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Chemical Kinetics questions and exercises with answers

Showing questions 1–28 of 28.

For a first-order reaction, the half-life period $t_{1/2}$ is related to the rate constant $k$ as:Read the answer and worked solution →The units of the rate constant for a zero-order reaction are:Read the answer and worked solution →Rebuild the sample half life by half lifeRead the answer and worked solution →Order or molecularity?Read the answer and worked solution →True or false: order and molecularityRead the answer and worked solution →Read the order off the rate lawRead the answer and worked solution →Complete the definition of orderRead the answer and worked solution →True or false: where a rate law comes fromRead the answer and worked solution →Instantaneous rate or average rate?Read the answer and worked solution →Match each symbol in the Arrhenius equation to its meaningRead the answer and worked solution →Complete the definition of activation energyRead the answer and worked solution →Tap everything that raises the rate of a reactionRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →The Arrhenius equationRead the answer and worked solution →Order the steps: find the order of a reactionRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →True or false: what kinetics studiesRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Tap every factor the chapter says affects the rateRead the answer and worked solution →Complete the collision theory modificationRead the answer and worked solution →Which quantity is being described?Read the answer and worked solution →Assertion and reason: rates and constantsRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Order the energy story of a reactionRead the answer and worked solution →True or false: the Arrhenius pictureRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →

Worked practice questions

For a first-order reaction, the half-life period $t_{1/2}$ is related to the rate constant $k$ as:

  1. $t_{1/2} = \dfrac{2.303}{k}$
  2. $t_{1/2} = \dfrac{0.693}{k}$
  3. $t_{1/2} = \dfrac{[A]_0}{2k}$
  4. $t_{1/2} = \dfrac{1}{k[A]_0}$
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Correct answer: B. $t_{1/2} = \dfrac{0.693}{k}$

For a first-order reaction $k = \dfrac{2.303}{t}\log\dfrac{[A]_0}{[A]}$. Setting $[A] = [A]_0/2$ at $t = t_{1/2}$ gives $k t_{1/2} = \ln 2 = 0.693$, hence $t_{1/2} = 0.693/k$. Option B is the zero-order expression option C is the second-order one.

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The units of the rate constant for a zero-order reaction are:

  1. $\text{mol}\,L^{-1}\,s^{-1}$
  2. $L^2\,\text{mol}^{-2}\,s^{-1}$
  3. $L\,\text{mol}^{-1}\,s^{-1}$
  4. $s^{-1}$
Show answer and solution

Correct answer: A. $\text{mol}\,L^{-1}\,s^{-1}$

Units of $k$ for an $n$-th order reaction are $\text{mol}^{1-n}\,L^{n-1}\,s^{-1}$. Putting $n=0$ gives $\text{mol}\,L^{-1}\,s^{-1}$, which is the same as the unit of rate itself, since the rate of a zero-order reaction is independent of concentration.

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Rebuild the sample half life by half life

Read exercise and reference answers
Sequence
  1. Item
    12.5%
  2. Item
    25%
  3. Item
    50%
  4. Item
    100%
Instructions
Drag one share onto an equal share to undo a half life, until the whole sample is back.
_Source: Qallery verified question bank, BSc Chemistry, topic Chemical Kinetics_

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