concept terms
What is oxidation and reduction
Oxidation is when the charge goes up and gets more positive. Reduction is when the charge goes down and becomes more negative.
What is a redox reactions?
When two reactants react in a way that causes the atom(s) or (ions) in one reactant to gain electrons by the other reactant losing those electrons.
What is a half reaction?
The oxidation or reduction portion of a redox reaction.
What is the difference between an electrochemical cell and a electrolytic cell? (where their energy comes from)
An electrochemical cell has its own power source and an electrolytic cell does not.
which of these elements is the least actively oxidized Pb, Fe, Ti, SR based on table J?
Pb is the least actively oxidized
What is an oxidation number/state?
The charge an atom has or appears to have in a reaction.
When is a reaction not redox?
When there is no change/ no gain or loss of electrons
If the reaction is oxidation which side of the reaction do the electrons go on and if it were reduction what side would the electrons be on?
If it were oxidation the electrons would be on the product side and if it were reduction they would be on the reactant side.
What does the anode and cathode determine and what occurs in each of them?
They determine direction that electrons or ions will flow in a cell. Oxidation occurs in the anode and reduction occurs in the cathode.
Higher up metals are more easily what?
oxidized
what is the oxidation number of a FREE element?
The oxidation number of a FREE element will always be zero
Fe(s) + O2(g) -> Fe2O3(g)
Is this reaction redox?
Yes it is redox
What should all half reactions be?
They should be balenced
What does a salt bridge do?
It allows the flow of ions and it maintains neutrality.
Based on Table J, which non-metal is most likely to be reduced?
F2
What does Rig and Oil stand for?
Reduction is gain and Oxidation is loss
Mg + O2 → MgO
Is is this a redox reaction?
Yes it is
Sb3+ → Sb5+ + 2e-
What is happening in this half reaction?
Sb3 is losing 2 electrons to become Sb5
How is voltaic and electrolytic cell energy converted?
Voltaic- chemical to electrical
Electrolytic- electrical to chemical
Based on Table J, which of these species in a reaction is most easily reduced? K, Ca, Ag, Co
Ag
When does hydrogen's oxidation state become -1
In medal hydrides
4HCl + MnO2 → MnCl2 + 2H2O + Cl2
Is this a redox reaction? Why or why not?
It is a redox reaction because there is a free element on the product side but not the reactant side so you can tell that there was a change. or Because Mn goes from +4 to +2 and Cl goes from -1 to 0.
What is the half reaction equation for C0 when it GAINS 4 electrons?
C0 + 4e- → C4-
Which way do electrons flow in a cell?
from the anode to the cathode
Which metal based on Table J, will react spontaneously with Mg2+?
Co(s) 2) Cr(s) 3) Cs(s) 4) Cu(s)
Cs will react with Mg