Supplemental Instruction
Iowa State University / Leader: / Nevin
Course: / Chem 177
Instructor: / Dr. Schewe-Miller
Date: / 10/19/2014
1) Which of the following are strong electrolyte(s)?
a) CH3COOH
b) NH3
c) KOH
d) CH3OH
e) HClO
f) NaOH
g) H2O
h) HCl
2) Which of the above are weak electrolyte(s)?
3) Which of the following are non-electrolyte(s)?
4) Now which are strong base(s)?
5) Strong acid(s)?
6) Speaking of which, what are the 7 strong acids?
7) Give an equation for one of the strong acids dissociating in water.
8) How do you know if compounds are soluble or not in water?
Write the complete ionic and net ionic equation for the following reaction. Label its spectator ions.
Copper II Hydroxide and Perchloric Acid
The following is a redox reaction. Which element is oxidized? Which is reduced? What is the oxidizing agent? What is the reducing agent?
P4s+10 HClOaq+6H2Ol→4H3PO4aq+10HClaq
Suppose you mix 70 mL of .80M solution of Lead (II) Nitrate with 30 mL of .20 M Sodium Sulfide. Write the balanced equation. State the limiting reagent(s). How much precipitate forms? What is the molarity of the products?
Which compound has the highest concentration of Potassium?
a)40 mL of 5M KCl
b)20 mL of 3M K2SO4
c)80 mL of 2M KNO3
d) 25 mL of 2M K3PO4
How would you prepare 175.0 mL of .150 M AgNO3 with pure AgNO3
How many grams of solute are in .250 L of .175 M KBr?
How many milliliters of .120 M HCl are needed to completely neutralize 50.0 mL of .101 M Ba(OH)_2 solution?
If 34 J of work is done on the system, but 50 J of heat is absorbed from the system, What is the change in internal energy ∆E? Is this an endothermic or exothermic process?
True or False:
Change in enthalpy for water from liquid to gas is positive.
Change in enthalpy from gas to liquid is endothermic.
If you reverse a reaction, the change in enthalpy stays the same (it is based off magnitude only)
In a bomb calorimeter, we need to take into account the mass of the substance.
If a piston is being pushed down, work is loss in the system.
If heat is given by surroundings, the heat exchange with respect to system is exothermic.
Which of the following is NOT a state function?
a) Volume
b) Work
c) Enthalpy
d) Energy
How do you find change in enthalpy In terms of change in energy, pressure, and change in volume?
A coffee-cup calorimeter contains 150.0g of water at 25.1 degrees C. A 121.0g block of copper metal is heated to 100.4 degrees C. The specific heat of Cu is .385 J/g * K. The Cu is added to the calorimeter, and after a time the contents of the cup reach constant 30.1 degrees C. Determine the amount of heat, in J, lost by the copper block and the amount of heat gained by the water.
1.150 g of sucrose goes through combustion in a bomb calorimeter. If the temperature rose from 23.42°Cto 27.64°C and the heat capacity of the calorimeter is 4.90 kJ/°C, then determine the heat of combustion of sucrose in kJ.
Calculate ΔH for the standard enthalpy of formation of B2H6(g)
Using the following data:
a) 4 B(s) + 3 O2(g) ---> 2 B2O3(s) / ΔH° = -2509.1 kJb) 2 H2(g) + O2(g) ---> 2 H2O(l) / ΔH° = -571.7 kJ
c) B2H6(g) + 3 O2(g) ----> B2O3(s) + 3 H2O(l) / ΔH° = -2147.5 kJ
How would you find the enthalpy of formation for B2H6(g) assuming we didn’t use hess’ law but had the ΔH° of each of the reactants and products?
Write the equation corresponding to the standard enthalpy of formation for NH3(g)
What is the relationship of frequency and wavelength?
Which electromagnetic radiation is fastest?
a) X-ray
b) Radio frequency
c) Beta rays
d) None of the above
An argon ion laser emits light at 789 nm. What is the frequency of the radiation? How much energy is emitted from 2 photons of this light.
Which one-step transition of energy always absorbs the most energy
a) n=2 to n=1
b) n=1 to n=2
c) n=100 to n=101
d) n=2 to n=3
Calculate the energy released or absorbed when an electron in hydrogen atom goes from n=2 to n=4. Is this energy absorbed or released?
Describe Heisenberg’s Uncertainty principle. (Can be as simple as one sentence)
When the principle quantum number is 2, what are the possible ml and l quantum numbers?
Which of the following is an impossible orbital combination?
1p, 4s, 5f, 2d