Unit 4 Electrochemistry Flashcards
Oxidation is:
a. losing electrons
b. gaining electrons
hint: LEONA
GERPC
Oxidation is losing electrons
Reduction is:
a. losing electrons
b. gaining electrons
hint: LEONA
GERPC
Reduction is losing electrons
F2 + 2e- –> 2F-
Is this oxidation or reduction?
hint: electrons are negative and F2 doesn’t have a charge
Reduction (electrons being added)
Ag –> Ag+ + 1e-
Is this oxidation or reduction?
Oxidation (electrons being lost)
Oxidation state: is the charge on the element
Hint: elemental form is 0, hydrogen is +1 if it is charged, oxygen is 2-
ex. What is the charge on N in N2O4?
O is 2-
2- times by 4 oxygens = -8
So overall charge for the N2 is +8
+8 divided by 2 = +4 for each nitrogen
What is the oxidation state of Br in HBr?
Hint: elemental form is 0, hydrogen is +1 if it is charged, oxygen is 2-
in HBr, H is +1 so Br is -1
What is the oxidation state of S8?
Hint: elemental form is 0, hydrogen is +1 if it is charged, oxygen is 2-
S8 is the elemental form of sulphur, so the oxidation state is 0
What are the 9 elements that are not singular in their elemental form?
H2, N2, O2, F2, Cl2, Br2, I2, P4, S8
A “redox” reaction has a reduction and an oxidation:
a. true
b. false
true, “redox” is short for reduction-oxidation
An oxidizing agent:
a. is oxidized
b. is reduced
hint: OAR
OAR: oxidizing agent is reduced
b. reduced
A reducing agent:
a. is oxidized
b. is reduced
hint: RAO
RAO: reducing agent is oxidized
a. is oxidized
What is disproportionation?
a. nothing is oxidized or reduced
b. the same substance is oxidized and reduced
b. the same substance is oxidized and reduced
Is oxidation state always the same as the ion charge (in top right corner) for an element?
no, oxidation state depends on the compound and can even be a fraction
