Redox Flashcards
(33 cards)
What is the oxidation number of an element in its elemental form?
0
True or False: The oxidation number of oxygen in most compounds is -2.
True
What is the oxidation number of hydrogen when bonded to nonmetals?
+1
What is the oxidation number of hydrogen when bonded to metals?
-1
What is the oxidation number of alkali metals in compounds?
+1
What is the oxidation number of alkaline earth metals in compounds?
+2
Fill in the blank: The sum of the oxidation numbers in a neutral compound is _____.
0
Fill in the blank: The sum of the oxidation numbers in a polyatomic ion equals the ion’s _____.
charge
What is the oxidation number of fluorine in compounds?
-1
Which rule states that the oxidation number of a free ion is equal to its charge?
The free ion rule
True or False: In redox reactions, the substance that is oxidized loses electrons.
True
What is the term for a substance that gains electrons in a redox reaction?
Reducing agent
What is the term for a substance that loses electrons in a redox reaction?
Oxidizing agent
What is the first step in balancing a redox reaction?
Identify the oxidation and reduction half-reactions.
True or False: In redox reactions, oxidation numbers must change.
True
Fill in the blank: The half-reaction method involves separating the oxidation and reduction processes into _____.
half-reactions
What is the oxidation number of carbon in CO2?
+4
What is the oxidation number of sulfur in H2SO4?
+6
True or False: The oxidation state of an atom can be a fraction.
False
What is the oxidation number of nitrogen in NH3?
-3
Fill in the blank: In a redox reaction, the oxidizing agent is reduced and the reducing agent is _____.
oxidized
What does the term ‘redox’ stand for?
Reduction and oxidation
True or False: The oxidation number of chlorine is always -1.
False
What is the oxidation number of phosphorus in H3PO4?
+5
