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Answer:

Presence or Absence of a Catalyst

Catalysts are substances that increase reaction rate by lowering the activation energy needed for the reaction to occur. A catalyst is not destroyed or changed during a reaction, so it can be used again.

Explanation:

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The activation energy that is been required in a reaction will decreased when there is presence of Catalyst.

  • Catalysis can be regarded as a  process involving the increase in the rate of a chemical reaction through addition of catalyst.

  • This catalyst usually speed the reaction up by lowering the activation energy of the system.

We can conclude that example of a catalyst is Nikel, used in hydrogenation.

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https://brainly.com/question/12558986?referrer=searchResults

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