CHEMISTRY 107 General Chemistry for Engineering Students Chemistry & Engineering Big stuff (objects, etc.) Materials Molecules Atoms Protons, Neutrons, Electrons Tinier stuff (particle physics) Dr. Larry Brown Grew up in Toms River, NJ B.S. in Chemistry, Rensselaer, 1981 Ph.D. in Chemistry, Princeton, 1986 Spent a year in (West) Germany, 2 in Chicago At TAMU since Fall 1988 AFS Teaching Awards: College of Science, 1998 University, 2000 SLATE teaching award, Spring 2011 Named Presidential Professor for Teaching Excellence, 2013 Larry Brown Office: HELD 104B (enter through door marked 104) Office phone: 845-3755 Office Hours: MWF, ~10:15 11:15 AM (between classes) M, 1:00 2:30 PM T, 1:30 3:00 PM e-mail: lsbrown@tamu.edu course web page: http://chem107.chem.tamu.edu/brown CHEM 107 / CHEM 117 This is a 3-credit course, lecture only My 2 sections meet MWF in HELD 100: Section 501: 9:10 10:00 AM Section 502: 11:30 AM 12:20 PM Most of you should also be enrolled in CHEM 117, a 1-credit lab course CHEM 117 LABS DO NOT MEET THIS WEEK! Exams Roughly every 4 weeks Mark your calendars! February 9, March 7, April 13 Final exam: Sec. 501 Friday, May 4, 8:00 AM Sec. 502 Tuesday, May 1, 10:30 AM
Required textbook There might still be some 2 nd edition copies around, and those would be OK. ebook options are also available Clickers We will be using clickers in class, starting next week. iclicker 2/iClicker+ OR iclicker REEF app www.iclicker.com Should be available in local bookstores If you already have one, bring it this week for a trial run For 117 Lab You will also need safety goggles Labs DO NOT meet this week. Grade Calculations 3 Exams @ 100 pts. = 300 pts (55%) Final Exam @ 150 pts. = 150 pts (27%) Reinforcement module = 27.5 pts ( 5%) Clicker questions = 22.5 pts ( 4%) Homework = 50 pts ( 9%) Total = 550 pts (100%) Letter Grades Based on the following numerical scale, using % of total points earned: > 87 = A 75-86 = B 63-74 = C 51-62 = D < 51 = F Your grade depends only on YOUR scores, NOT on class averages, etc. Homework: LON-CAPA Electronic homework system You will have a set due most weeks Submit answers online to my server Instant feedback at any time of day or night Try, try again
Problem Set #1 is available now Due by Tuesday night, 1/23 Mainly simple exercises for basic skills, but some problems may require some thought. Please try to login to make sure the system recognizes you. Use your NetID for the username, and enter it in all lowercase. Use your NetID password, just like you use to login to Howdy or ecampus. Advice (which should help for all your classes) Don t get behind. Come to class, keep up with reading, homework, etc. Get to work NOW, not when things start to be due! If I seem to think you know more than you really do, then you need to work on that. Advice Think of the assigned problem sets as the minimum that you might need to do. Most of you may need to work additional problems to succeed. (You can use textbook or OWL for that.) Get help if you need it classmates, TA s, me, tutors, etc Atoms Atoms contain protons, neutrons, electrons Nucleus = protons & neutrons Electrons surround nucleus Protons: + charge Electrons: charge Neutrons: no charge Single Atom Images: Scanning Tunneling Microscope Atomic Theory of Matter Matter composed of atoms Atoms of a given element have identical chemical properties Different elements have different properties Atoms combine in whole number ratios Not created or destroyed in ordinary chemical reactions
Periodic Table Atomic Weights Symbol for element C 12.011 6 Atomic Number Atomic Weight Atoms have measurable masses. Atomic weight of an element is average mass of an atom of the element. (Why average?) Units: 1 amu = 1.66 x 10 27 kg Find mass of an average carbon atom in grams. (atomic weight = 12.011 amu) Mass of C atom Mass of C atom 12.011 amu x 1.6606 x10-27 kg amu x 1,000 g 1 kg = 1.9945 x10-23 g Isotope Mass (amu) Ga 68.92558 Ga: 68.92558 Ga: 70.92470 Ga:.723 Ga 70.92470 Gallium has 2 stable isotopes as shown above. Given atomic mass of Ga is.723, calculate the isotopic abundances
Ga: 68.92558 Ga: 70.92470 Ga:.723 MM = x m + x m = x m + (1 x ) m MM m = x m x m = x (m m ) x = (MM m ) / (m m ) = -1.2017 / -1.9991 = 0.6011 Physical properties: Density Properties & the Periodic Table