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Welcome to CHEM 114!

Instructor: Professor Gerard S. Harbison. Office: Hamilton Hall 723, telephone 472-9346. Professor Harbison's office hours: Monday 2:00 p.m. - 4:00 p.m. or by appointment. Welcome to CHEM 114!. Teaching Assistant:. Mr. Marins’ office hours:. Grading: Midterms (x 4) 18%, Final 28%.

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Welcome to CHEM 114!

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  1. Instructor:Professor Gerard S. Harbison Office: Hamilton Hall 723, telephone 472-9346 Professor Harbison's office hours: Monday 2:00 p.m. - 4:00 p.m. or by appointment. Welcome to CHEM 114! Teaching Assistant:. Mr. Marins’ office hours: Grading: Midterms (x 4) 18%, Final 28%. Final at regularly scheduled time (Mon. May 5, 10:00 am - 12:00 noon) Partially cumulative (70% on last few weeks work, 30% on the rest of the semester) Extra credit for occasional unannounced reci. quizzes. Missed Exams: If there is a conflict between a recognized UNL student activity and an examination, I need to be informed about it by the end of the first week of the course. If you miss an examination for a medical reason, I need within a week of the exam a letter from a medical professional stating that owning to illness on the date in question, you were unable to take the exam. See me if for other reasons you think yourself unable to take the exam. Work-related conflicts are not acceptable excuses. CHEM 114 Lecture 1 1/13/2014

  2. Grading Web directory:http://setanta.unl.edu/CHEM114/ or Blackboard Powerpoints:http://setanta.unl.edu/CHEM114/notes or Blackboard Syllabus:http://setanta.unl.edu/CHEM114/syllabus.pdf or Blackboard Homework voluntary but highly recommended. It will be assigned each Friday. At least one question from each hour-exam will be taken, with some small alterations to keep you honest, from the homework. CHEM 114 Lecture 1 1/13/2014

  3. Welcome to CHEM 114 Text: General Chemistry: Principles and Modern Applications by Petrucci/Herring/Madura/Bissonnette, 10th edition. We will cover chapters 14-25, approximately one per week. Expectations: This is not an easy course. I make no apologies for that. Outside of reci, you need to set aside at least 5 hours a week for it. I expect you to pay active attention. This means not just listening, but thinking about what has been said. I expect you to read the assigned text in advance. I expect you to be able to answer questions on it in class. CHEM 114 Lecture 1 1/13/2014 I award extra credit for particularly good questions in lecture,and intelligent answers when I call on you. Attendance and active participation in recitation is also expected

  4. Welcome to CHEM 114: schedule CHEM 114 Lecture 1 1/13/2014 Grading: Letter grades will be assigned as follows. This page is on the World Wide Web at http://setanta.unl.edu/CHEM471/syllabus.html.

  5. Introduction: basic units The Système International (SI) is a system of units based on the meter, kilogram and second. http://physics.nist.gov/cuu/Units/index.html SI units are the only units we will use in this course. The second is the duration of 9192631770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. The meter is the length of the path traveled by light in vacuum during a time interval of 1/299792458 of a second. The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. CHEM 114 Lecture 1 1/13/2014 http://www.foxnews.com/science/2013/01/07/kilogram-has-gained-weight/

  6. Introduction: more basic units The ampere is the constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10–7 Newton per meter of length. The Kelvin, the unit of thermodynamic temperature, is the fraction 100/27316 of the thermodynamic temperature of the triple point of water (0.01 C) The mole is the amount of substance of a system that contains a number of particles equal to the number of atoms in exactly 0.012 kg of isotopically pure carbon 12. That number is Avogadro’s constant and is approximately (6.02214179 ± 0.00000030) x 1023 mol–1 CHEM 114 Lecture 1 1/13/2014 http://physics.nist.gov/cuu/Constants/index.html

  7. Introduction: derived units Acceleration has units of meters per second squared (m s–2) For example, the acceleration due to gravity at the earth’s surface is 9.8 m s–2 Force is derived from acceleration via Newton’s second law: f= ma. The SI unit of force is the Newton; 1 N = 1 kg m s–2 So the force exerted by an object of 1 kg in the earth’s gravitational field is 9.8 N; weight is a kind of force. A Newton isn’t much force; it’s the weight of a 102 g object (3 1/2 ounces). Pressure is force per unit area. Since the SI unit of area is m2, the SI unit of pressure, the Pascal; 1 Pa = 1 N m–2 = 1 kg m–1 s–2 CHEM 114 Lecture 1 1/13/2014 Because a meter squared is quite a large area, a Pascal is a very small unit of pressure. Because it’s so small, we often use two other units. 1 bar = 105 Pa 1 atm = 101325 Pa The SI units of volume are m3 This is a volume much larger than chemists or biochemists are used to dealing with, and so we tend to work in L or mL. 1000 L = 106 mL = 1 m3

  8. Introduction: unit conversions Example: The usual chemists’ units of density and molecular weight are g/mL and g/mol respectively. Convert these to SI units. Answer: 1 g/mL × 106 mL/m3 × 10–3 kg/g = 103 kg m–3 1 g/mol × 10–3 kg/g = 10–3 kg/mol = 10–3 kDa Example: The minimum central pressure recorded for Hurricane Dean was 906 mbar. Convert that to Pascals and Megapascals CHEM 114 Lecture 1 1/13/2014 Answer: 906 mbar × 10–3 bar/mbar × 105 Pa/bar = 90,600 Pa = 0.0906 MPa http://en.wikipedia.org/wiki/Hurricane_Dean

  9. Introduction: for Wednesday… Read chapter 14! CHEM 114 Lecture 1 1/13/2014

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