C2.1 Keywords

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  1. Activation energy (3) - C2:3
    • The energy required to start a chemical reaction.
  2. Rate (3) - C2:3
    • The speed at which a chemical reaction proceeds.
  3. Concentration (3) - C2:3
    • the amount of a substance per defined space. (often measured as mol/dm3 or g/dm3)
  4. Chemical reaction (2) - C2:2
    • A process that leads to the chemical transformation of one set of chemical substances to another.
  5. Pressure (2) - C2:2
    • The force applied perpendicular to the surface of an object per unit area over which that force is distributed.
  6. Endothermic (1) - C2:1
    • A chemical reaction takes in energy from the surroundings.
  7. Exothermic (1) - C2:1
    • A chemical reaction that transfers energy to the surroundings.
  8. Reversible (1) - C2:1
    • A chemical reaction where the reactants form products that, in turn, react together to give the reactants back.
  9. Surface area (1) - C2:1
    • A measure of the total area that the surface of the object occupies.
  10. Enzyme (1) - C2:1
    • A protein manufactured by a cell, that acts as a biological catalyst.
  11. Catalyst (1) - C2:1
    • A substance that speeds up the rate of a chemical reaction, but is not consumed. Works by lowering the activation energy.
  12. Collision (1) - C2:1
    • An event in which two or more bodies exert forces on each other for a relatively short time.
  13. Frequency (1) - C2:1
    • The number of occurrences of a repeating event per unit of time.
  14. Dynamic Equilibrium (1) - C2:1
    • The point at which both forward and backward reactions are taking place at the same rate. The concentrations of the reactants and products are constant, but are not necessarily equal.
  15. Le Chatelier (1) - C2:1
    • The scientist who developed the theory used to predict the effect of changing conditions upon a chemical equilibrium.
  16. Product (1) - C2:1
    • The species formed from chemical reactions.
  17. Reactant (1) - C2:1
    • The starting materials in a chemical reaction.