CHEM 1215 Comprehensive Final Exam Review Problems

 

1.      What volume will 72.0 g of ethanol occupy if the density of ethanol is 0.790 g/mL?

 

2.      What is the mass of 25.0 mL of ethanol if its density is 0.790 g/mL?

 

3.      Convert 0.125 km to mm using dimensional analysis.

 

4.      Write the formulas for the following compounds:

a.   sodium phosphate

b.   aluminum carbonate

c.   calcium bromide

d.   carbon monoxide

e.   iron (III) oxide

f.    potassium sulfate

g.   copper (II) nitrate

h.   sulfur trioxide

i.    copper (II) hydroxide

j.    dinitrogen tetroxide

 

5.      Balance the following equation.

C3H6  +        O2     à       CO2  +             H2O

 

6.      Given the following equation:    N2  +  3 H2  à  2 NH3

a.   How many moles of hydrogen are needed to react completely with 0.25 moles of nitrogen?

b.   How many grams of ammonia can be produced using 1.5 moles of hydrogen?

c.   How many grams of ammonia can be produced using 15.0 g of nitrogen?

 

7.      What is the molarity of a solution prepared by dissolving 25.0 g of sodium hydroxide in enough water to make 125 mL of solution?

 

8.      List the alkali metals.  List the halogens.

 

9.      Give the names and formulas for the 7 strong acids.

 

10.  What volume of 0.25 M potassium hydroxide is needed to completely neutralize 125 mL of 0.25 M sulfuric acid?

 

11.  Calculate the hydroxide ion concentration for a solution that contains 25.0 mL of 0.100 M sodium hydroxide and 15.0 mL of 0.200 M calcium hydroxide.

 

12.  What volume of 6.0 M HCl is needed to prepare 250.0 mL of 3.0 M HCl?

 

13.  For SO2, draw a valid Lewis structure, identify its electron domain geometry, molecular geometry, and the hybrid orbitals used by the sulfur atom.

 

14.  Name the four intermolecular forces.  Which intermolecular force is primarily responsible for the physical properties of the following:

 

a.      H2O

b.      CH4

c.      CH3OH

 

15.  Give an example of an ion-dipole interaction.

 

16.  Draw a reaction energy diagram for an endothermic reaction.  Label each of the following:  reactants, products, transition state, heat of reaction, activation energy.

 

17.  What physical states are in equilibrium at the boiling point?  The melting point?  The triple point?

 

18.  What is the oxidizing agent in the following reaction?

Cl2 (g)  +  2 I- (aq)  à 2Cl- (aq)  +  I2 (s)

 

19.  Given the following thermochemical equation, what is the enthalpy change associated with the formation of 1.5 g of KCl?

2KClO3 (s) à 2 KCl (s) + 3 O2 (g)  DH = -89.4 kJ

 

20.  What is the specific heat of a substance if 104.5 J of heat must be added to increase the temperature of 5.00 g of the substance from 21.2oC to 26.2oC?

 

21.  At equilibrium, the reaction N2(g) + 3H2(g)          2NH3(g) had the following concentrations:  [N2] = 0.0850 M, [H2] = 3.10 x 10-3 M, and [NH3] = 0.0310 M.  What is the value of Kc ?

22.  What are the [H+], [OH-], pH, and pOH for a 0.200 M HC7H5O2 solution? 

(Ka = 6.3 x 10-5)

 

23.  What is the pH of a 2.5 x 10-4 M Al(OH)3 solution?

 

24.  Predict the sign of DS for the sublimation of dry ice.

 

25.  DGo for the dissolution of BaSO4 is 56.8 kJ at 25oC.  Is the process spontaneous or non-spontaneous?  What are the equilibrium concentrations of Ba2+ and SO42-?

 

26.  Calculate DHo, DSo, and DGo for the following reaction.  Use the data in Appendix C.

6 Cl2 (g) + 2 Fe2O3 (s) à 4 FeCl3 (s) + 3 O2 (g)

 

27.  Write a balanced equation for the spontaneous reaction that occurs in a galvanic cell composed of Al/Al3+ and Zn/Zn2+ half cells.  Which metal will be the anode?  Write the reaction that occurs at the anode.  Calculate the standard cell potential for this cell.  Use the reduction potentials given in the appendix of your text.

 

28.  Write the formula for:  (a)  2-bromo-2-methylhexane;  (b)  3-ethyl-1-pentanol;  (c)  2-pentyne;  (d)  cis-2-butene.

 

29.  For each structure you drew in question 28, identify the electron domain geometry and hybrid orbitals for carbon number 3.

 

30.  Use the following equation and data:  2 NH3 (g) à  N2 (g)  + 3 H2 (g) to answer the questions below:

Time (min)

[NH3]

0.

1.20 x 10-1 M

60.

6.50 x 10-2 M

120.

1.10 x 10-2 M

 

  1. Calculate the rate of disappearance of ammonia between 60. and 120. minutes.
  2. Calculate the rate of appearance of hydrogen for that time interval.
  3. What is the concentration of nitrogen after 120. min?
  4. If the concentration of ammonia decreases at a rate of 0.25 M/hr, at what rate is hydrogen formed?

 

31.  The reaction  2 A + B à C + D is first order in A and second order in B.  If the concentration of B is cut in half, by what factor does the rate of the reaction change?