What does the Arrhenius equation explain?
Correct answer: D. Temperature
- A. Pressure
- B. Concentration of a substance
- C. Volume
- D. Temperature
Explanation
Arrhenius' equation in thermodynamics is:k = Ae-Ea/RT wherek = rate constantA = pre-exponential factorEa = activation energyR = universal gas constantT = temperatureThis equation explains the dependence of the rate of reaction on temperature and does NOT explain anything about the pressure, volume, or concentration of the substance.Do not confuse this with the Arrhenius ionic theory which describes acids as substances that release hydrogen ions (H+) when dissolved in an aqueous solution. On the other hand, substances that release hydroxide ions (OH−) are bases.
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About Activation Energy and Activated Complex
Activation energy is the minimum energy reactant particles need to form the activated complex, or transition state, during a reaction. Energy profile diagrams show the forward and reverse activation energies, while catalysts provide an alternative pathway with lower activation energy without changing the reaction enthalpy.
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