How many ox?
How many oxidation state(s) need to change for a chemical reaction to be a redox reaction?
2
Why is the following reaction a redox reaction?
Mg + Cl2 --> MgCl2
The oxidation state of both magnesium and chlorine both changed.
During a redox reaction between particle A and particle B, Particle A is reduced by gaining 5 electron. How many electrons did particle B lose?
B lost 5 electrons
What is the energy conversion in a voltaic cell?
chemical energy to electrical energy
What is the energy conversion in an electrolytic cell?
What is the oxidation number of hydrogen in LiH?
ox st = -1
An element's oxidation state changes from +2 to +4. Is it being oxidized or reduced?
oxidized
Given the following redox reaction,
Fe3+ + Zn --> Zn2+ + Fe
write the oxidation half reaction
Zn --> Zn2+ + 2 e-
What is one metal that will react spontaneously with Cs1+ in an voltaic cell?
Li...Rb...K
You have the following materials: Zn metal, Cu metal, 150mL of 0.1M Zn(NO3)2, 150mL of 0.1M Cu(NO3)2, wires, and a voltmeter.
If you want to build a electrolytic cell, what is one material you are missing?
a battery
What is the oxidation state of chlorine in KClO3 ?
ox st = +5
Sr+2 is reduced to Sr0. What is happening in terms of electrons?
Sr+2 gaines 2 electrons.
What type of half reaction is indicated by the following reaction?
Na+ + e– --> Na
reduction half reaction
In a voltaic cell, what sign is the anode?
anode is negative
Which metal is more active than Ni and less active than Zn?
Cr... Fe...Co
What is the oxidation state of nitrogen in HNO2 ?
ox st = +3
it is a reducing agent
Which of the following equation is balanced?
A) Fe3+ + Al --> Fe2+ + Al3+
B) Fe3+ + 3Al --> Fe2+ + 3Al3+
C) 3Fe3+ + Al --> 3Fe2+ + Al3+
D) 3Fe3+ + Al --> Fe2+ + 3Al3+
C) 3Fe3+ + Al --> 3Fe2+ + Al3+
In a voltaic cell, the oxidation occurs at the anode. Over time, what happens to the volume of the anode?
Which electrode in an electrolytic cell increases in mass?
the cathode
What is the oxidation state of phosphorus in PO43- ?
ox st = +5
what type of reaction is ALWAYS a redox reaction?
Single replacement
Given the following redox reaction,
Mn5+ + Zn --> Mn + Zn2+
what is the smallest coefficient for Manganese when this redox reaction is correctly balanced?
coefficient of 2
What is the purpose of a salt bridge in an voltaic cell?
It is a path for the flow of positive and negative ions to maintain neutrality in the cell.
A key is being coated with silver. What are the reduction and oxidation half reactions occurring in this electrolytic cell responsible for coating the key?
red: Ag+ + 1 e- --> Ag
ox: Ag --> Ag+ + 1 e-