Calculations
1 Faraday in the form of charge and mol of electrons
What is 96,500 and the charge of 1 mol of electrons?
The way to safely observe smells produced in a reaction #safetyfirst
What is wafting?
The cathode and anode equations that occur when molten calcium chloride undergoes electrolysis
What is the cathode: Ca2+(l) + 2e- -> Ca(s)
What is the anode: 2Cl-(l) -> Cl2(g) + 2e-
The charge and reaction that occurs at the anode in an electrolytic cell.
What is positive and oxidation?
What is the absence of water?
The charge of 3 mol of electrons
What is 289,500C?
Q = 3 x 96,500
Factors affecting what is produced in an electrolytic cell
(3 points)
What is the concentration of the electrolyte, temperature, and pressure?
The full equation of the electrolysis of aqueous sodium bromide
What is
2Br-(aq) + H2O(l) -> H2(g) + 2OH-(aq) +Br2(l)
The source of electrons to the cell
What is an external power supply?
The characteristic of an aqueous electrolyte and what is needed to consider when using it.
What is an electrolyte with water that can react because it is a stronger reactant and/or oxidant?
The calculations used to find Q
What is Q = I x t
Charge = current (amps) x time (seconds)
What is Q = n(e-) x F
Charge = mol of electrons x 96,500
The pH change during the electrolysis of aqueous CuSO₄
What is a decrease in pH (acidic)?
Ms. Nichol's favorite half equation and why
What is the hydrogen peroxide equation?
Bc she has big oxygen tanks in her backyard and "always needs more hydrogen peroxide"
A non-reacting electrode and example of one
What is an inert electrode?
eg. Platinum or graphite
Purpose of an electrolyte
What is an electricity conducting liquid to allow movement of electrons
What is 0.0933mol
Q = 20 x 15 x 60 = 18,000C
n(e-) = 18,000/96,500 = 0.187mol
n(Cu) = 1/2 x 0.187 = 0.0933mol
Visible observations of the electrolysis of molten FeI2
(3 points)
What is the formation of Iron and Iodine crystals?
What is a loss of color in the solution?
The location of the following reaction
Cd(s) ⇌ Cd2+(aq) + 2e–
when reacting with aqueous iron (II)
What is the cathode?
Faraday's first name.
Who is Michael?
Electrolyte most commonly used in commercial electrolytic cells
What is an aqueous solution?
The mass of oxygen gas produced when a dilute solution of nickel(II) sulfate undergoes electrolysis for 3 hours 25 minutes using a current of 0.40A
What is 0.41g?
Q = 0.4 x 12,300 = 4920C
n(e-) = 4920/96,500 = 0.05098mol
n(O2) = 0.05098 x 1/4 = 0.0127mol
m(O2) = 0.0127 x 32 = 0.41g
(5 points)
What is H2(g), OH-(aq), H+(aq), O2(g), Cl2(g)
The cathode and anode equations that occur in the electrolysis of H2SO4(aq) when oxygen gas is supplied to the cell.
What is the cathode:O2(g) + 4H+(aq) + 4e– → 2H2O(l)
What is the anode: 2H2O(l)→O2(g) + 4H+(aq) + 4e-
The electrode in the cell where electroplating occurs and a common example used for commercial purposes.
What is the cathode and copper plating of pots and pans?
The disadvantages of using a molten electrolyte
What is lots of power and money needed on a commercial level?