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18 Problems for Exam 3 - Principles of Chemistry I | CHEM 1211, Exams of Chemistry

Material Type: Exam; Class: Principles of Chemistry I; Subject: Chemistry; University: Clayton State University; Term: Summer 2004;

Typology: Exams

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Uploaded on 08/04/2009

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Name:_____________________________________________________
CHEMISTRY 1211
SUMMER 2004
EXAM #3
This exam is eighteen questions long. Please read through all of the questions first and
ask about anything you do not understand. You will have one hour and 15 minutes to
complete this exam. Exams will be picked up at the end of the class period. No late
exams will be accepted!
You are allowed to use a calculator. If you do not have a calculator, setting up the
problem correctly will gain you some points but you will not receive full credit for any
question you do not answer completely.
Included in this exam is a periodic table, which should be stapled to the back of the exam.
CHEATING IS NOT ALLOWED. ANYONE CAUGHT CHEATING WILL RECEIVE
A ZERO ON THIS EXAM.
The exam is worth a total of 100 points. Each question is labeled with its exact point
value. Be sure to answer all of the questions on the exam.
Good Luck!
GIVEN INFORMATION
Water Vapor Pressure
25ºC 23.80 mmHg
30ºC 31.82 mm Hg Equations
c= E = h
STP = 1 atm and 273 K =h/mv
Plank’s Constant
Speed of light h = 6.626x10-34 J s
c = 2.998 x108 m/s
Ideal Gas Law Constant Rydberg Constant
R = 0.0821 L atm / mol K R = 1.097x107 m-1
Conversion Factors Rydberg Equation
1 atm = 760 torr = 760 mmHg
)
11
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1
2
2
2
1
nn
R
1 J = 1 kg m2/ s2
1
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Name:_____________________________________________________ CHEMISTRY 1211 SUMMER 2004 EXAM # This exam is eighteen questions long. Please read through all of the questions first and ask about anything you do not understand. You will have one hour and 15 minutes to complete this exam. Exams will be picked up at the end of the class period. No late exams will be accepted! You are allowed to use a calculator. If you do not have a calculator, setting up the problem correctly will gain you some points but you will not receive full credit for any question you do not answer completely. Included in this exam is a periodic table, which should be stapled to the back of the exam. CHEATING IS NOT ALLOWED. ANYONE CAUGHT CHEATING WILL RECEIVE A ZERO ON THIS EXAM. The exam is worth a total of 100 points. Each question is labeled with its exact point value. Be sure to answer all of the questions on the exam. Good Luck! GIVEN INFORMATION Water Vapor Pressure 25ºC 23.80 mmHg 30ºC 31.82 mm Hg Equations c= E = h  STP = 1 atm and 273 K =h/mv Plank’s Constant Speed of light h = 6.626x10-34^ J s c = 2.998 x10^8 m/s Ideal Gas Law Constant Rydberg Constant R = 0.0821 L atm / mol K R = 1.097x10^7 m- Conversion Factors Rydberg Equation 1 atm = 760 torr = 760 mmHg )

2 2 2 n 1 n

 R 

1 J = 1 kg m^2 / s^2

  1. The amount of gas that occupies 60.82 L at 31ºC and 367 torr is ____________ mole. (5 points)
  2. The volume of fluorine gas required to react with 2.67 g of calcium bromide to form calcium fluoride and bromine gas at 41C and 4.31 atm is ________________mL. Be sure to write and balance an equation. (5 points)
  3. CO (5.0 g) and CO 2 (5.0 g) were placed in a 750 mL container at 50C. The total pressure in the container was _____________ atm.

6.A gas is considered “ideal” if _________________. a. It is not compressible b. One mole of it occupies exactly 1 liter at standard temperature and pressure c. It can be shown to occupy zero volume at 0º C d. Its behavior is described by the ideal- gas equation e. One mole of it in a one liter container exerts a pressure of exactly 1 atm at room temperature. (3 points)

  1. According to the kinetic molecular theory molecules of different gases at the same temperature always have the same _______________. a. Molecular mass b. Pressure c. Average kinetic energy d. Volume e. Average density (3 points)
  2. Arrange the following gases in order of increasing average molecular speed (from slowest to fastest) at 25C. Cl 2 O 2 F 2 N 2 (5 points)
  3. One of the spectral lines in the emission spectrum of sodium has a wavelength of 655. nm. What is the frequency of the line? How much energy does one MOLE of these photons contain?
  1. Calculate the wavelength in nanometers of the line in the Balmer series that results from the transition from n=4 to n=2. (28 points)
  2. List all four of the quantum numbers for each electron in the nitrogen atom. (correct form 1,0,0,+1/2) oxygen has 7 electrons n l ml ms (6 points)
  3. Draw a picture of each of the three p orbitals. Be sure to draw and label the axis.