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Catalyst quiz

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  • What is a catalyst in a chemical reaction?
    A catalyst is a substance that increases the rate of a reaction by lowering the activation energy without being consumed in the process.
  • How does a catalyst affect the activation energy of a reaction?
    A catalyst lowers the activation energy required for the reaction to proceed.
  • Does a catalyst get used up during a chemical reaction?
    No, a catalyst is not consumed during the reaction and can be used repeatedly.
  • What does the energy diagram of a catalyzed reaction show compared to an uncatalyzed reaction?
    The energy diagram shows a lower energy barrier (activation energy) for the catalyzed reaction compared to the uncatalyzed one.
  • What is represented by the difference between the reactant line and the transition state in an energy diagram?
    The difference represents the activation energy of the reaction.
  • How does the height of the activation energy barrier relate to reaction speed?
    A higher activation energy means a slower reaction, while a lower activation energy means a faster reaction.
  • What happens to the activation energy when a catalyst is added to a reaction?
    The activation energy decreases when a catalyst is added.
  • Why do reactants convert to products more easily in a catalyzed reaction?
    Because the activation energy is lower, making it easier for reactants to overcome the energy barrier.
  • What does the red curve typically represent in an energy diagram comparing catalyzed and uncatalyzed reactions?
    The red curve represents the uncatalyzed reaction with higher activation energy.
  • What does the blue curve represent in the energy diagram discussed?
    The blue curve represents the catalyzed reaction with lower activation energy.
  • What is the transition state in a chemical reaction energy diagram?
    The transition state is the highest energy point between reactants and products on the energy diagram.
  • How does a catalyst influence the time it takes for reactants to become products?
    A catalyst decreases the time needed by lowering the activation energy, allowing reactants to convert to products more quickly.
  • What is the overall change in energy of a chemical reaction shown in an energy diagram?
    It is the difference between the energy of the reactants and the products.
  • Does the catalyst change the overall energy change (ΔE) of the reaction?
    No, the catalyst does not change the overall energy change; it only lowers the activation energy.
  • Why is understanding catalysts important in chemistry?
    Understanding catalysts is crucial because they make reactions faster and more efficient by lowering activation energy.