Definition

1. Noun:
   • A catalytic effect: "Contact action" refers to the acceleration of a chemical reaction caused by the presence of a substance that itself remains chemically unchanged at the end of the reaction. This is a specific, technical term for catalysis.

Usage

• The term "contact action" is used in specialized scientific contexts, particularly in chemistry and chemical engineering, to describe the phenomenon of catalysis.
• It is a formal and somewhat dated synonym for "catalysis." In modern scientific writing, "catalysis" is the more common term.

Examples of Usage

• Noun:
  • The industrial process relies on the contact action of a metal surface to synthesize ammonia efficiently.
  • Early chemists studied the contact action of platinum on hydrogen peroxide decomposition.

Advanced Usage

• "to exhibit contact action": to function as a catalyst.
  • The enzyme was found to exhibit contact action, speeding up the reaction without being consumed.

Variants and Related Words

• Catalysis (n): The modern and more frequently used term for the process of increasing the rate of a chemical reaction by a catalyst.
  • Heterogeneous catalysis is a major field of study.
• Catalyst (n): The substance that causes the contact action or catalysis.
  • The catalyst provided the necessary contact action for the polymerization.
• Catalytic (adj): Relating to or causing contact action/catalysis.
  • The material's catalytic properties were exceptional.

Synonyms

• Catalysis: The acceleration of a chemical reaction by a catalyst.
• Catalytic action: Another phrase meaning the action of a catalyst.

Notes on Meaning

• "Contact action" is a historical term that emphasizes the idea of the catalyst being in physical "contact" with the reactants. Its meaning is identical to "catalysis." It is rarely used in contemporary scientific literature, having been largely replaced by the term "catalysis."

Noun

1. acceleration of a chemical reaction induced the presence of material that is chemically unchanged at the end of the reaction
   • of the top 50 commodity chemicals, 30 are created directly by catalysis and another 6 are made from raw materials that are catalytically produced