redox

• Who is the presenter of the OCR Redux revision video?

  Chris Harris
• What is the main purpose of the OCR Redux revision video?

  To provide an overview of the content required for Redux
• Where can students purchase the PowerPoints used in the video?

  Through a link in the description box
• What acronym is used to remember the concepts of oxidation and reduction?

  OIL RIG
• What does OIL RIG stand for?

  Oxidation is Loss, Reduction is Gain
• What happens to electrons during oxidation?

  Electrons are lost
• What happens to electrons during reduction?

  Electrons are gained
• In the reaction where calcium burns in oxygen, what is the oxidation process?

  Calcium forms Ca²⁺ by losing two electrons
• In the reaction where oxygen is involved, what is the reduction process?

  Oxygen gains electrons to form O^2-
• What is a reducing agent?

  A substance that loses electrons and is oxidized
• What is an oxidizing agent?

  A substance that gains electrons and is reduced
• What is the oxidation state of uncombined elements?

  Zero
• What is the oxidation state of ions?

  It is the same as the charge of the ion
• What is the oxidation state of Group 1 elements?

  Plus one
• What is the oxidation state of Group 2 elements?

  Plus two
• What is the oxidation state of aluminum?

  Plus three
• What is the oxidation state of hydrogen in hydrides?

  Minus one
• What is the oxidation state of chlorine in KCl?

  Minus one
• What is the oxidation state of chlorine when bonded with fluorine or oxygen?

  It can hold a positive value
• What is the oxidation state of fluorine?

  Minus one
• What is the oxidation state of oxygen in most compounds?

  Minus two
• What is the oxidation state of oxygen in peroxides?

  Minus one
• What is the oxidation state of oxygen in OF₂?

  Plus two
• What is the oxidation state of nitrogen in NH₃?

  Minus three
• What is the oxidation state of sulfur in H₂S?

  Minus two
• What is the oxidation state of oxygen in O₂?

  Zero
• What is the oxidation state of oxygen in H₂O₂?

  Minus one
• What is the oxidation state of sulfur in H₂SO₄?

  Plus six
• What is the oxidation state of iron in Fe₂O₃?

  Plus three
• What is the oxidation state of iron in FeO?

  Plus two
• What is the oxidation state of vanadium in V₂O₅?

  Plus five
• What is the oxidation state of vanadium in V₂O₄?

  Plus four
• What is the systematic name of ClO₂^-?

  Chlorate
• What is the oxidation state of chlorine in ClO₂^-?

  Plus three
• What is the difference between oxidation and reduction in terms of oxidation numbers?

  Oxidation is an increase, reduction is a decrease
• In the reaction 2Na + Cl₂ → 2NaCl, what happens to sodium?

  Sodium is oxidized from 0 to +1
• In the reaction 2Na + Cl₂ → 2NaCl, what happens to chlorine?

  Chlorine is reduced from 0 to -1
• What is produced when metals react with acids?

  A salt and hydrogen gas
• In the reaction of calcium with hydrochloric acid, what happens to calcium?

  Calcium is oxidized from 0 to +2
• In the reaction of sodium with sulfuric acid, what happens to sodium?

  Sodium is oxidized from 0 to +1