Finding Activation Energy (AQA A-Level Chemistry): Quizzes

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Finding Activation Energy
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What is activation energy (EaE_a)?

Min. energy for reaction to occur

What does the Arrhenius constant (AA) represent?

Frequency of collisions with proper orient.

What is the value of the gas constant (RR)?

8.31 J K1^{-1} mol1^{-1}

What is plotted on the y-axis to find EaE_a graphically?

lnk\ln k

What is plotted on the x-axis in Arrhenius graphical analysis?

1T\frac{1}{T}

What does the gradient equal in an lnk\ln k vs 1T\frac{1}{T} plot?

EaR-\frac{E_a}{R}

What is the formula to calculate EaE_a from the gradient?

Ea=gradient×RE_a = -\text{gradient} \times R

If the gradient is -5000, what is EaE_a in kJ mol1^{-1}?

41.55 kJ mol1^{-1}

What does a higher EaE_a indicate about reaction rate?

Slower reaction

What does a lower EaE_a suggest about a reaction?

Faster reaction

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