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Spontaneous vs Nonspontaneous Reactions quiz

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  • What does spontaneity in a chemical reaction determine?
    Spontaneity determines whether a reaction or process can occur naturally under certain conditions without continuous external energy.
  • What is a spontaneous reaction?
    A spontaneous reaction is a natural process that does not require a constant outside energy source and favors the formation of products at equilibrium.
  • What is a non-spontaneous reaction?
    A non-spontaneous reaction is an unnatural process that requires a constant outside energy source and does not favor the formation of products at equilibrium.
  • Does spontaneity indicate how fast a reaction occurs?
    No, spontaneity does not determine the speed of a reaction; it only indicates if the reaction can occur naturally.
  • What is the difference between thermodynamics and kinetics in chemistry?
    Thermodynamics deals with whether a reaction can occur (spontaneity), while kinetics deals with the speed of the reaction.
  • Give an example of a spontaneous reaction involving carbon.
    The conversion of diamond to graphite is a spontaneous reaction, though it occurs very slowly over millions of years.
  • Why is the conversion of graphite to diamond considered non-spontaneous?
    It is non-spontaneous because it requires significant energy input, such as heat and pressure, and does not occur naturally.
  • What is required for a non-spontaneous reaction to occur?
    A non-spontaneous reaction requires a constant flow of external energy to proceed.
  • Is photosynthesis a spontaneous or non-spontaneous reaction, and why?
    Photosynthesis is non-spontaneous because it requires sunlight as an external energy source to convert CO2 and water into glucose.
  • Is cellular respiration spontaneous or non-spontaneous?
    Cellular respiration is spontaneous because it naturally converts glucose and oxygen into CO2 and water without needing external energy.
  • If a reaction is spontaneous in one direction, what can be said about the reverse reaction?
    If a reaction is spontaneous in one direction, the reverse reaction is non-spontaneous.
  • Can a spontaneous reaction be slow? Give an example.
    Yes, a spontaneous reaction can be slow; for example, the conversion of diamond to graphite takes millions of years.
  • What happens to the formation of products at equilibrium in a spontaneous reaction?
    A spontaneous reaction favors the formation of products at equilibrium.
  • What happens to the formation of products at equilibrium in a non-spontaneous reaction?
    A non-spontaneous reaction does not favor the formation of products at equilibrium and tends to remain as reactants.
  • Why are diamonds considered precious in terms of spontaneity?
    Diamonds are precious because their formation from graphite is non-spontaneous and requires extreme conditions, making them rare.