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Basic Concepts quiz

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  • What does 'LEO the lion goes GER' stand for in redox reactions?
    'LEO' stands for 'Lose Electrons = Oxidation' and 'GER' stands for 'Gain Electrons = Reduction.'
  • In the reaction between lithium and chlorine, which element is oxidized and which is reduced?
    Lithium is oxidized (loses electrons) and chlorine is reduced (gains electrons).
  • What is the oxidation number of lithium in its elemental form and as an ion?
    In its elemental form, lithium's oxidation number is 0; as an ion, it is +1.
  • What role does the reducing agent play in a redox reaction?
    The reducing agent is the species that is oxidized and donates electrons to another species.
  • How is electrical charge (Q) calculated in terms of moles of electrons?
    Electrical charge Q is calculated as Q = n × Faraday's constant, where n is the number of moles of electrons.
  • What are the units for electrical charge, and what symbol is used to represent it?
    Electrical charge is measured in coulombs (C) and is represented by the symbol Q or q.
  • How is electrical current (I) defined and what are its units?
    Current (I) is defined as charge per unit time (I = Q/t) and is measured in amperes (A), where 1 ampere = 1 coulomb/second.
  • What is Faraday's constant and how is it derived?
    Faraday's constant is approximately 9.647 × 10^4 C/mol e⁻, derived from the charge of one electron multiplied by Avogadro's number.
  • What is the formula relating work, voltage, and charge?
    Work (W) is calculated as W = voltage (E) × charge (Q).
  • How does Ohm's Law relate current, voltage, and resistance?
    Ohm's Law states that current (I) equals voltage (V) divided by resistance (R): I = V/R.
  • What are the units for electrical power and how is power calculated?
    Power is measured in watts (W) and can be calculated as power = voltage × current or power = work/time.
  • What is the relationship between Gibbs free energy and electrical potential in redox reactions?
    Gibbs free energy change (ΔG) is related to electrical potential by ΔG = -n × Faraday's constant × voltage.
  • What is the first step in balancing a redox reaction in an acidic solution?
    The first step is to separate the overall reaction into two half-reactions.
  • How are hydrogen atoms balanced in acidic and basic solutions during redox balancing?
    In acidic solutions, H⁺ ions are added to balance hydrogen; in basic solutions, OH⁻ ions are added to neutralize excess H⁺.
  • Why must the number of electrons lost and gained be equal when balancing redox reactions?
    The number of electrons must be equal to ensure charge conservation and that the overall reaction is balanced.