oxidation states

• What are oxidation numbers also known as?

  Oxidation states
• What do oxidation numbers indicate in a compound?

  The degree of oxidation of atoms
• What is the oxidation number of uncombined elements?

  • Oxidation number is 0
• What is the oxidation number of atoms in molecules bonded to identical atoms?

  • Oxidation number is 0
• What is the oxidation number of a monatomic ion?

  Equal to its charge
• What is the sum of oxidation numbers in a molecular ion?

  Equals the overall charge
• What is the sum of oxidation numbers in a neutral compound?

  Equals zero
• What is the usual oxidation number of combined oxygen?

  -2
• What is the oxidation number of oxygen in peroxides?

  -1
• What is the oxidation number of oxygen in OF2?

  +2
• What is the usual oxidation number of combined hydrogen?

  +1
• What is the oxidation number of hydrogen in metal hydrides?

  -1
• How is the negative oxidation number assigned in compounds with two non-metals?

  • Given to the more electronegative element
• What oxidation number does fluorine always have?

  -1
• How do you determine the oxidation number of carbon in H2CO3?

  By calculating total oxidation numbers
• What are the steps to determine the oxidation number of carbon in H2CO3?

  1. Assign known oxidation numbers for H and O
  2. Calculate total oxidation number from O
  3. Calculate total oxidation number from H
  4. Set up equation for total oxidation number
• What is the oxidation number of carbon in H2CO3?

  +4
• How do you determine the oxidation number of chromium in K2Cr2O7?

  By calculating total oxidation numbers
• What are the steps to determine the oxidation number of chromium in K2Cr2O7?

  1. Assign known oxidation numbers for K and O
  2. Calculate total oxidation number from K
  3. Calculate total oxidation number from O
  4. Set up equation for total oxidation number
• What is the oxidation number of chromium in K2Cr2O7?

  +6
• How are variable oxidation numbers indicated in element names?

  • Using Roman numerals after the element's name
• What does iron(II) signify?

  Iron with an oxidation number of +2
• What does iron(III) signify?

  Iron with an oxidation number of +3
• What do '-ate' compounds contain?

  • Oxygen plus another element
• How are variable oxidation numbers indicated in '-ate' compounds?

  • Using Roman numerals after the compound's name
• What is the oxidation number of sulfur in sulfate(VI)?

  • +6
• What is the oxidation number of sulfur in sulfate(IV)?

  • +4
• What is the oxidation number of nitrogen in nitrate(III)?

  • +3