Test 3b Practice
Supplemental Instruction
Iowa State University / Leader: / Sara
Course: / Chem177
Instructor: / Kingston
Date: / Monday, October 27

1)Given:

H2O2(g) H2 (g)+ O2 (g)∆H = -509 kJ

2H2O(g)  2H2 (g)+ O2(g)∆H = -763 kJ

H2O(g)  H2O(l)∆H = 233 kJ

What is the ∆H of the reaction:

O2 (g)+ 2 H2O (l) 2H2O2(g)∆H =

2)If an electron moves from n=6 to n=3 what wavelength of light is emitted? What kind of light is given off?

3)2H3PO4 + 3Ba  3H2 + Ba3(PO4)2∆H= -435kJ

  1. If 9.00 mol of H3PO4 is reacted, what is the ∆H?

4)Which set of quantum numbers is possible?

  1. n= 4l= 4ml= -3ms= +1/2
  2. n= 3l= 0ml= +1ms= +1/2
  3. n= 2l= 1ml= -1ms= -1/2
  4. n= 3l= -2ml= +2ms= -1/2

5)Which is not a quantum number?

  1. Magnetic quantum number
  2. Electric quantum number
  3. Azimuthal quantum number
  4. Principal quantum number

6)If you have the electron configuration 1s22s22p63s23p64s23d104p6, What charge need to be added to Se atom to make the electron configuration valid?

  1. -2
  2. -1
  3. 0
  4. +1
  5. +2

7)What is the electron configuration for Copper?

8)If you dissolve 4.3 grams of KCl (0.058 moles) in 98 mL of water, and the temperature changes from 21.4 to 26.6 degrees C.Is the reaction endothermic or exothermic?

9)100.00 mL of 1.00 M HCl (aq) is combined with 100.00 mL of 1.00 M Sr(OH)2 in a coffee cup calorimeter. Both solutions are initially at 21.1oC, after the reaction they are at 27.8oC.you can assume density and specific heat of water for the solutions. The reaction that occurs is: 2HCl(aq) + Sr(OH)2(aq) 2H2O(l) + SrCl2(aq)

  1. Determine the limiting reagent of the reaction?
  1. Calculate ΔH for the reaction in kJ per mole of limiting reagent
  1. Using your ΔH from part b find the ΔH for the net ionic reaction:

H+(aq) + OH-(aq)H2O(l)

10) Which of the following equations has a ΔHrxn that is equal to the ΔHfor of the product?

  1. 3H2(g) + N2(g)  2NH3(g)
  2. 6C(s) + 6H2(g) + 3O2(g)  C6H12O6(s)
  3. CH2(g) + H2(g)  CH4(g)
  4. 2H+(g) + 1/2O2(g)  H2O(l)

11)What is the total number of orbitals containing electrons in a nitrogen atom?

  1. 3b. 4c. 5d. 6

12)The Orbital sketched is found in the fifth shell. Which orbital is shown?

  1. 5pb. 5dc. 5fd. 4f