Electrochemistry
Which of the following species is most easily reduced?
Zn (s)
Ni (s)
Zn2+ (aq)
Ni2+ (aq)
4
State the type of reaction:
Ag (s) + Mg(NO3)2 (aq)--> Mg(s) + AgNO3 (aq)
single replacement or redox (accept either or both)
True or false: Adding more H+ ions to a solution increase the pH.
False
In a container carbon dioxide has a partial pressure of 0.7 atm, while hydrogen gas has a partial pressure of 1.2 atm. Calculate the total pressure in the container
1.9 atm
State the type of reaction
C3H8 + 5O2 → 3CO2 + 4H2O
T/F: The reaction 2Al + 3Zn2+ → 2Al3+ + 3Zn Ecell = +0.9V, is thermodynamically favorable.
T
How many bonds between oxygen molecules are present in the following reaction:
C3H8 + 5O2 → 3CO2 + 4H2O
5 double bonds (would accept 10)
In a titration, at what point is the pKa = pH?
HALF equivalence point
4L of gas with a pressure of 7 atm was compressed into 2L, calculate the new pressure.
14 atm
In a second order reaction, what is on the y-axis of the linear graph?
1/[A]
In the reaction Zn + Ni2+ → Zn2+ + Ni, Zn is the reducing agent.
true
Draw the Lewis structure of water, and state its VSPER geometry
bent
What is the role of a buffer in solution?
To prevent the pH from changing drastically in any direction
A 4.6 L container has a temperature of 600K with 3.5 moles of oxygen. Calculate the pressure in this container.
37.4 atm
For a reaction to be thermodynamically favorable, state the signs of S, H, and G
+, -, -
What is the oxidation state of cobalt in the compound Co2(SO4)3
+3
A solid strip polished magnesium ribbon is dropped into a silver nitrate solutions.
Write the balanced complete ionic equation for the reaction. Be sure to include phases!
Write the balanced net ionic equation for the reaction. Be sure to include phases!
Mg(s) + Ag+(aq) + NO3- (aq) --> Mg2+ (aq) + NO3- aq + Ag(s)
Ag+ +1e- --> Ag (s)
NH3 + H2O → NH4+ + OH-
a. Identify the Bronsted-lowry acid/base pair
b. Determine the pOH of this solution if the concentration of OH- is 8.2 x 10-5 M.
NH3 (base) + NH4+ (conj acid)
H2O (acid) + OH- (conj base)
4.09
A 350 mL tank at 323K contains a carbon monoxide gas that exerts a pressure of 3.5 atm. Determine the number of grams of carbon monoxide in this container
1.29 grams
Is NH3 is capable of H-Bonding with C2H6?
NO
Explain or show in pictures how a voltaic cell works. Be sure to show the electron path
Electrons flow from anode to cathode. There is a solid metal in aqueous solution at either end. The difference in potential causes electrons to move, reducing the metal at the cathode.
C2H6 + O2→ CO2 + H2O
a. Balance the reaction above
b. How many grams of carbon dioxide can be produced if you begin with 5.4 grams of oxygen.
2, 7, 4, 6
4.24 grams of CO2
The pKa of an acid is 8.26.
a. Calculate the Ka.
b. Calculate the Kb.
c. Calculate the pKb.
5.5 x 10-9
1.8 x 10-6
5.74
When do gases behave most ideally? EXPLAIN WHY!
Low pressure high temperature - IMF are negligible, and the size of the molecules become negligible compared to the space between them
What is the chemical formula for dry ice?
CO2