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Rate of Reaction quiz

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Terms in this set (15)

  • What is chemical kinetics?
    Chemical kinetics is the study of reaction rates, focusing on how fast reactants convert into products over time.
  • What does the term 'rate' refer to in chemical reactions?
    Rate refers to the speed at which reactants are converted into products in a chemical reaction.
  • How can reaction rates be observed?
    Reaction rates can be observed by monitoring changes in the concentrations of reactants and products over time.
  • What is the difference between a reaction that goes to completion and one that reaches equilibrium?
    A reaction that goes to completion uses up almost all reactants to form products, while a reaction at equilibrium has both reactants and products present in constant amounts.
  • What does a single arrow in a chemical equation indicate?
    A single arrow indicates the reaction goes to completion, converting all reactants to products.
  • What do double arrows in a chemical equation represent?
    Double arrows represent a reaction at equilibrium, where both forward and reverse reactions occur.
  • Why does increasing concentration speed up a reaction?
    Increasing concentration raises the number of molecules, leading to more frequent collisions and a higher chance of reaction.
  • What two conditions must be met for molecules to react during a collision?
    Molecules must collide with sufficient energy and in the correct orientation to react.
  • How does surface area affect reaction rate?
    Greater surface area increases the frequency of collisions, speeding up the reaction.
  • Why do linear molecules react faster than cyclic or branched ones?
    Linear molecules have more surface area available for collisions, leading to a faster reaction rate.
  • How does temperature influence the rate of a chemical reaction?
    Increasing temperature raises molecular energy and collision frequency, which accelerates the reaction rate.
  • What is the role of a catalyst in a chemical reaction?
    A catalyst increases the reaction rate by lowering the activation energy required for the reaction to proceed.
  • What is the activation energy in a chemical reaction?
    Activation energy is the minimum energy needed for reactants to reach the transition state and form products.
  • How does a catalyst change the reaction pathway?
    A catalyst provides an alternative pathway with a lower activation energy, making it easier for reactants to become products.
  • List the four main factors that can increase the rate of a chemical reaction.
    The four main factors are increasing concentration, increasing surface area, increasing temperature, and adding a catalyst.