Practice Quiz

Praxis II General Science

Category - Major Ideas

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In many reactions, there is something called an activation energy. Which of the following statements best describes the concept of activation energy?
  1. An energy state that must be reached before a reaction can begin.
  2. The amount of energy produced by the reaction.
  3. The amount of energy required to split apart a molecule in the reaction.
  4. The energy state of the products in the reaction.
  5. The combined energy total of the reactants and the products.
Explanation
Answer: A - The activation energy is an energy state that must be reached before the reaction can begin. Many substances are inherently unreactive. However, if heated or otherwise given energy, the excitation of the electrons in the reactants will reach a higher energy state and allow for a reaction to occur.
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