Factors that affect Rate of Reaction

Scientific concepts, discoveries, or nature phenomena presented

• Prerequisites for chemical reactions

  • A chemical reaction requires enough energy to break bonds holding particles (reactant molecules) together.
  • The rate of reaction is the speed at which new particles/products form.

• Activation energy

  • Activation energy is the minimum energy required for reactant particles to react.
  • Analogy: striking a match provides friction/heat that supplies the activation energy needed to start the reaction.

• Factors that affect the rate of reaction (four factors)

  1. Temperature
     • Higher temperature → faster rate of reaction
     • Reason: particles move more quickly, causing more frequent collisions with greater energy.
  2. Concentration
     • Higher concentration of reactants → faster rate
     • Reason: reactant particles are closer together, leading to more frequent collisions.
  3. Surface area (for solid reactants)
     • Larger surface area → faster rate
     • Reason: more of the solid reactant is exposed, increasing opportunities for collisions/reactions.
     • Example: grinding a solid into a powder increases surface area and speeds reaction.
  4. Inhibitors or catalysts
     • Inhibitors: substances that slow down a reaction.
       • Three commonly cited types:
         • Corrosive inhibitor: decreases the rate of oxidation of metal.
         • Enzyme inhibitor: binds to an enzyme and reduces enzyme activity (chemistry/biology).
         • Reaction inhibitor: any substance that decreases the rate of a chemical reaction.
     • Catalysts: substances that speed up a reaction by lowering activation energy.
     • Example: enzymes in the body act as catalysts to speed up biochemical reactions.

List of researchers or sources featured

• None explicitly named in the subtitles (e.g., no specific scientists or published sources mentioned).