IB HL CHEM - Arrhenius Equation

What is A. Click all that apply

• Collision factor

• Frequency of collisions

• Arrhenius factor

• Pre-exponential factor

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NGSS.HS-PS1-5

What are the units of temperature in the Arrhenius equation ?

• Celsius

• Fahrenheit

• Centigrade

• Kelvin

Increasing the temperature by 10 degrees increases the rate by approximately what factor ?

• 10

• 1

• 2

• 3

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NGSS.HS-PS1-5

• +38.8 kJ mol^-1

• +38.8 J mol^-1 K^-1

• + 562 J mol^-1

• + 562 J mol^-1 K^-1

Answer explanation

B uses the incorrect units for activation energy, as does D.

C has divided the gradient by R (as has D)

A is the only possible answer.

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NGSS.HS-PS1-5

What can be deduced from the position of the activation energy on a Maxwell-Boltzmann distribution curve?

• Number of particles in the rate determining step

• Number of successful collisions per second

• Order of reaction

• Proportion of particles with sufficient energy to react

What does the Arrhenius Equation primarily describe?

• The change in reaction rate with temperature

• The proportion of molecules with energy equal to activation energy

• The energy required to start a reaction

• The effect of catalysts on reaction rate

Tags

NGSS.HS-PS1-5

• 5.80 s^-1

• 0.580 s^-1

• 850 s^-1

• 8.50 s^-1

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NGSS.HS-PS1-5

Arrhenius equation is

• k = Ae^Ea/RT

• k = Ae^-Ea/RT

• k = Ae^RT/Ea

• k = Ae^-RT/Ea

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NGSS.HS-PS1-5

Temperature Dependence of Rate Constants: Identify the incorrect statement among the following

• According to the Arrhenius equation, a plot of ln(k) versus 1/T (where T is the temperature in Kelvin) yields a straight line with a slope of -Ea/R.

• The Arrhenius equation predicts that the rate constant (k) decreases as the temperature increases, showcasing the temperature's impact on reaction speed.

• Activation energy (Ea) and the gas constant (R) are factors in the Arrhenius equation that determine the temperature dependence of the rate constant.

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NGSS.HS-PS1-5

Activation Energy and the Arrhenius Equation: Identify the incorrect statement among the following

• The Arrhenius equation shows that the rate of a reaction increases exponentially with an increase in temperature due to a decrease in activation energy.

• Activation energy is the minimum energy that reacting molecules must possess for a reaction to occur, as described by the Arrhenius equation.

• The Arrhenius equation illustrates the inverse relationship between activation energy and the rate constant, demonstrating how lower activation energies result in higher reaction rates.

Tags

NGSS.HS-PS1-5