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Redox Reactions quiz

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  • What does the term 'redox' stand for in chemistry?
    'Redox' is short for oxidation-reduction, referring to reactions involving the transfer of electrons between molecules.
  • What is oxidation in a redox reaction?
    Oxidation is the process of losing one or more negatively charged electrons.
  • What is reduction in a redox reaction?
    Reduction is the process of gaining one or more negatively charged electrons.
  • Why do oxidation and reduction reactions always occur simultaneously?
    Because when one molecule loses electrons (oxidation), another must gain those electrons (reduction).
  • What mnemonic helps remember the difference between oxidation and reduction?
    'Leo the lion goes ger' helps remember that Losing Electrons is Oxidation and Gaining Electrons is Reduction.
  • What is the charge effect when a molecule gains electrons?
    Its overall charge is reduced because it gains negatively charged electrons.
  • What role do electron carriers play in biological redox reactions?
    Electron carriers transport electrons during processes like cellular respiration, acting like 'electron taxi cabs.'
  • What are the oxidized forms of NADH and FADH2?
    NAD+ and FAD are the oxidized forms, meaning they have lost electrons.
  • How many electrons can NADH and FADH2 carry?
    Both NADH and FADH2 can carry a maximum of 2 electrons.
  • What happens to NAD+ when it picks up electrons and a hydrogen ion?
    It becomes NADH, the full 'taxicab' version carrying 2 electrons and a hydrogen ion.
  • What is the difference between NADH and NADPH?
    NADPH contains a phosphate group and is used mainly in biosynthetic reactions to build molecules and cell structures.
  • What is the function of NADPH in the cell?
    NADPH transports electrons for biosynthetic reactions, helping build molecules and cell structures.
  • How does FAD become FADH2?
    FAD picks up 2 electrons and 2 hydrogen ions to become FADH2, the full electron carrier.
  • What is the 'empty' form of NADPH called?
    The empty form is NADP+, which has no electrons.
  • Where do NADH and FADH2 deliver their electrons during cellular respiration?
    They deliver their electrons to the electron transport chain, the final stage of cellular respiration.