Definitions
What is Oxidation?
What is a LOSS of electrons
What are the two metals in our Battery example in Module 16?
What is Copper (Cu) and Zinc (Zn)
What must occur for an equation to be a redox reaction?
Electrons must move from one species (the reducing agent) to another (the oxidizing agent), or one side of the equation to another.
Group 1A is always
+1, -1, 0
+1
What is reduction
What is a GAIN of electrons
What is the purpose of the salt bridge
What is an aqueous solution which allows ions to break apart and move independently
2Na (s) + Cl2 ---> 2NaCl (s)
Yes - Cl went from 0 to -1, indicating that Cl was reduced. At the same time, Na went from 0 to +1, indicating that Na was oxidized.
Group 2A is always:
+1, +2, -2
+2
What is an Anode?
The negative side of the batter. The source of the anions.
What direction are the electrons flowing?
NiO (s) + Cd (s) ---> CdO (s) = Ni (s)
Yes. This is a redox reaction because Ni went from +2 to 0, indicating that Ni was reduced. At the same time, C went from 0 to +2, indicating that Cd was oxidized
Halogens are usually:
-1, +1, 0
-1, but positive with oxygen
What is a Cathode?
The positive side of the battery - the source of the cations
What happens to ZN's electrode mass when the electrons stop flowing? Weigh less or weigh more?
What is weigh less
Mg(NO3)2 (aq) + 2NaOH (aq) ---> Mg(OH)2(s) + 2NaNo3 (aq)
In this reaction, Mg stayed at +2, O stayed at -2, and N stayed at +5, Na stayed at +1 and H stayed at +1. Thus, this is NOT a redox reaction
Halogens are in which column on the periodic table?
7A
What does aqueous mean?
What is means dissolved in water
What happens to the Cu electrode mass when the electrons stop flowing? Weigh more or weigh less?
What is weigh more
H2SO4(aq) + 2NH3(aq) --->2NH4+(aq) + SO42-(aq)
In this reaction, H stayed at +1, S stayed at +6, O stayed at -2, and N stayed at -3, Thus, this is NOT a redox reaction.
H, O, and F are called what?
Polyatomic ion, Monatomic ion, neutral compounds
Monatomic ion