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Calculate Oxidation Numbers quiz

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  • What is the oxidation number of an atom in its natural or standard state?
    The oxidation number is 0 for an atom in its natural or standard state.
  • What is the oxidation number of Group 1A elements when connected to another element?
    Group 1A elements have an oxidation number of +1 when connected to any other element.
  • What is the oxidation number of Group 2A elements in compounds?
    Group 2A elements have an oxidation number of +2 in compounds.
  • What is the oxidation number of fluorine in compounds?
    Fluorine has an oxidation number of -1 when connected to any other element.
  • How does hydrogen's oxidation number change depending on what it is bonded to?
    Hydrogen is +1 when bonded to nonmetals and -1 when bonded to metals or boron.
  • What is the typical oxidation number of oxygen in compounds (excluding peroxides and superoxides)?
    Oxygen usually has an oxidation number of -2 in compounds, unless it is in a peroxide or superoxide.
  • What is the oxidation number of oxygen in peroxides?
    In peroxides, oxygen has an oxidation number of -1.
  • What is the oxidation number of oxygen in superoxides?
    In superoxides, oxygen has an oxidation number of -1/2.
  • What is the oxidation number of Group 7A elements (Cl, Br, I) in compounds?
    Group 7A elements have an oxidation number of -1 unless they are connected to oxygen.
  • What is the oxidation number of a monoatomic ion?
    The oxidation number of a monoatomic ion is equal to its charge.
  • What are cations and anions?
    Cations are positive ions and anions are negative ions.
  • How do you calculate the oxidation number of a non-listed element in a compound?
    Treat the unknown element as 'x', use known oxidation numbers, distribute subscripts, and set up an equation equal to the compound's charge.
  • What are diatomic molecules and which elements form them naturally?
    Diatomic molecules are H2, N2, O2, F2, Cl2, Br2, and I2; these elements exist as pairs in their natural state.
  • In nature, how does phosphorus and sulfur exist?
    Phosphorus exists as P4 and sulfur as S8 in their natural states.
  • Why do oxidation numbers not always correspond to real charges?
    Oxidation numbers are a bookkeeping tool and can differ from actual ionic charges, especially in compounds.