Chemistry 100                                                                                     Dunnivant

Exam 3                                                                                                Spring, 2004

 

Name (printed)  _____________________

 

Closed notes, closed book, closed Internet, closed neighbor!

 

I have neither given nor received aid on this exam.  __________________________

                                                                                                Signature

 

There are 105 points on this exam.  IÕll give you 5 and grade it on a 100 point basis.

 

Specific heat of ice = 2.1 J/g-K

Specific heat of water = 4.2 J/g-K

Specific heat of steam = 2.0 J/g-K

Heat of fusion of ice = 333 J/g

Heat of vaporization = 2260 J/g

 

q (heat) = specific heat * mass of water * change in temperature

 

PV = nRT

 

R = 0.08205 atm-L/mol-K

 

P1V1 = P2V2

 

V1/T1 = V2/T2

 

 

 

 

 

 

 

 

 

 

 


  1. (10 pts) Give a possible chemical formula for each of the following

 

Butane

 

 

 

 

Heptene

 

 

 

 

Pentyne

 

 

 

 

An aromatic hydrocarbon

 

 

 

An organic compound with an alcohol group

 

 

 

 

An organic compound with a ketone group

 

 

 

 

An organic compound with an ester group

 

 

 

 

An organic compound with an aldehyde group

 

 

 

An organic compound with an amine group

 

 

 

An organic compound with an ether group

 

  1. (5 pts) Name three common anions and three common cations in natural water.

 

 

 

 

 

 

 

 

 

  1. (10 pts) List three unique properties of water and explain one of them in detail.  How does the one you explain affect life or chemistry?  What is the fundamental basis of the unique property?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (10 pts) A 100.0 grams chunk of ice at –30oC is to be heated to 150oC steam.  How much heat is needed?  Express your answer in KJ.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (10 pts) a)List 5 goals of domestic wastewater treatment.

 

 

 

 

 

 

 

 

 

 

 

 

b)What is the purpose of the primary clarifier in a domestic wastewater treatment plant?

 

 

 

 

 

            c)What is the purpose of the biological contact unit in a domestic wastewater treatment plant?

 

 

 

 

 

 

 

 

  1. (5 pts) Explain bioconcentration (or biomagnification, or bioaccumulation) and list one pollutant that undergoes bioconcentration.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (5 pts) You are conducting an experiment where you are studying the effects of gas volume change with temperature.  You hold the moles and pressure constant in your system, but vary the temperature.  If you start with a 4.00 L system at 25oC, what will be the volume of the system if increase the temperature to 75oC?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (15 pts) You consume a 14.0 gallon tank of gasoline in your car.  What volume (in liters) of CO2 will you produce?  Assume that your gasoline has a chemical formula of C8H18.  Assume that there are 3.78 L/gallon, the density of the gasoline is 0.850 g/mL, 25oC, and 1.00 atm pressure.  There are 1000 mL per L.  Assume that all of the gasoline burns in your car.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (5 pts) Are we safe from ozone depletion today?  Explain your anwer.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  1. (5 pts) How do the following forms of electromagnetic radiation interact with matter?  (what do they do to molecules or chemical bonds?)

 

 

IR

 

 

 

 

 

Visible light

 

 

 

 

 

UV light

 

 

 

 

 

Microwaves

  1. (10 pts) Draw the Lewis dot structure for the following and illustrate with arrows how each molecule can vibrate in a way to cause global warming.

 

 

Carbon dioxide

 

 

 

 

 

 

Methane

 

 

 

 

 

Water

 

 

 

 

 

 

 

 

 

12.   (15 pts) You fly to Europe for the summer and are excited about having a great time.  To your disappointment you sat next to a coal energy lobbyist on the plane.  You take it onto yourself to convince this conservative-viewed person that global warming is real (as in harmful) and that he/she should change jobs.  YouÕve got 8 hours on the plane but much let time to give your answer here.  Your must use the computer to write your answer and you must draw (from memory) any rough figures that you need to defend your point of view.