WorksheetsElectrochem
Total questions: 15
Worksheet time: 16mins
in a redox reaction, the species that loses electrons
is called the cathode
gains mass at the electrode
is oxidized
decreases in oxidation number
As an element is oxidized, its oxidation number
decreases as electrons are lost
increases as electrons are lost
decreases as electrons are gained
increases as electrons are gained
. Mg + PbCl2 → MgCl2 + Pb
Which statement correctly describes the oxidation and reduction that occur?
Mg is oxidized and Pb+2 is reduced
Mg is reduced and Cl- is oxidized
Mg is oxidized and Cl- is reduced
Mg is reduced and Pb+2 is oxidized
What is oxidation number of Cr in Cr2O72-?
-2
+6
+2
+12
What is the oxidation number of nitrogen in N2?
-3
+4
0
-1
What are the coefficients when the equation is balanced?
1 + 1 + 1 --> 2 + 1 + 3
1 + 2 + 1 --> 2 + 2 + 3
2 + 2 + 2 --> 4 + 2 + 3
1 + 1 + 1 --> 1 + 1 + 1
Cu∣Cu2+∥Fe2+,Fe3+∣Pt In this cell
Copper ion is the oxidizing agent
Fe3+ is the oxidizing agent
Copper is the oxidizing agent
Fe2+ is the oxidizing agent
Which type of electrochemical cell is used as a battery?
voltaic
electrolytic
What is reduction?
It is the gain of electrons.
It is the creation of electrons.
It is the loss of electrons.
It is the destruction of electrons.
Galvanic cells convert
mechanical energy in to electrical energy
electrical energy in to chemical energy
potential energy in to electrical energy
chemical energy in to electrical energy
Pb + 2Ag+ → Pb+2 + 2Ag
The chemical species being reduced is
Ag
Pb+2
Pb
Ag+
Which of the following is the balanced half -reaction for the oxidation of Cu to Cu+2?
Cu --> Cu+2
Cu --> Cu+2 + 2 e-
Cu + 2 e- --> Cu+2
Cu - 2e- --> Cu+2
State one functions of salt bridge
to maintain the movement of electron
to separate two electrolyte
to allowing electron to flow and complete the circuit
to maintain the electrical neutrality of the cell
What is a half-reaction?
It is a reaction at equilibrium where half of the substances are reactants and half of the substances are products.
It shows EITHER the reduction component or the oxidation component of a redox reaction.
It is the reaction that occurs when the switch of a galvanic cell is open.
It shows BOTH the reduction and oxidation components of a redox reaction.
HIDE ANSWER
For the cell reaction
Z n + Cu2+..................> Zn2+ +Cu
cell representation is
Zn/Zn2+ // Cu2+/Cu
Cu/Zn2+ //Zn/ Cu2+
Cu2+/Cu //Zn/Zn2+
Cu2+/Zn/ // Zn2+/Cu
