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Which of the following is not a factor that affects the rate of a reaction? A - Scottish Highers Chemistry - Question 22 - 2019
Question 22
Which of the following is not a factor that affects the rate of a reaction? A. Activation energy B. Kinetic energies of reactant molecules C. Concentration of reacta... show full transcript
Worked Solution & Example Answer:Which of the following is not a factor that affects the rate of a reaction? A - Scottish Highers Chemistry - Question 22 - 2019
Step 1
Identify the non-factor
Answer
To determine which option does not affect the rate of a reaction, we need to analyze each choice:
- A. Activation energy: This is a critical factor as it determines the energy threshold that reactants must overcome for the reaction to occur.
- B. Kinetic energies of reactant molecules: The kinetic energy influences the frequency and energy of collisions between reactants, affecting the reaction rate.
- C. Concentration of reactants: Increased concentration typically leads to a higher reaction rate due to more frequent collisions.
- D. Enthalpy change of reaction: This indicates the heat change during a reaction but does not directly influence how quickly reactants convert to products.
Therefore, the correct answer is D. Enthalpy change of reaction, as it is not a direct factor affecting the rate of the reaction.