Day 2new Chem 105 f2010 compat (1)

Day 2new Chem 105 f2010 compat (1) - Chem Chem 105 105 If...

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Unformatted text preview: Chem Chem 105 105 If you have questions before or after class, please address them to the Peer Mentors. Learning Communities Hydrogen, Helium, Sodium, Magnesium please sit in rows 1&2 1 Turn to a neighbor Turn to a neighbor you don’t know you don’t know and introduce and introduce yourself.. yourself “I have designed ChemTutor to have provide pre-lecture instruction so that you can arrive at lecture already familiar with some of the basics… You should take careful notes as you complete each ChemTutor exercise. We will not be going back over this material in class and you will need the notes to study for the exams.” the from Syllabus John D. Lamb, BYU Educational thought for the day: For a disciple of Jesus Christ, academic scholarship is a form of worship. (Neal Maxwell) 2 John D. Lamb, BYU Practice Sheet 1 Practice Do BLC part before tomorrow (including a part you do on paper + a part in MasteringChemistry) Do DLC part on paper in Learning Community with practice partner—bring some blank paper. John D. Lamb, BYU BLC’s and DLC’s Do this problem Do on a separate paper to turn in paper 4 This example problem This is just to help you— is don’t turn in John D. Lamb, BYU Remember: to get full points on written BLC’s and DLC’s and • turn them in on time • show your work CLEARLY in step-by-step fashion (when multiple steps to get to the answer) 5 Helpful news: I have extended the deadline for the MasteringChemistry portion of the BLC Practice Sheet due tomorrow until 11:59 pm on Monday. Note: the written portion is still due tomorrow in LC. 6 John D. Lamb, BYU No confusion!!! confusion!!! You don’t print out and turn in the MasteringChemistry portion of the BLC assignment. 7 Mastering Chemistry Mastering Chemistry Score 100 80 60 40 20 0 0 8 20 40 60 Final Grade (%) 80 100 John D. Lamb, BYU Setting your IClicker Setting frequency frequency • Hold ON/OFF button until blue Hold Power light flashes Power • Hit “C” twice • “Vote Status” should turn green • Do this every day as soon as you Do take your seat. take • Today: fun & practice (no points) 9 John D. Lamb, BYU An O atom or ion always differs An from an F atom or ion in: from a) The number of neutrons in the nucleus b) The number of electrons c) The number of protons in the nucleus d) Both a & b e) Both b & c 10 John D. Lamb, BYU What is your major area? a) Chemistry b) other science major in PhysMathSci or Biol c) engineering d) nursing e) major in other colleges 11 John D. Lamb, BYU What year are you in school (not What by credits but by # of years actually attending college)? attending a) freshman b) sophomore c) junior d) senior 12 John D. Lamb, BYU Did you read the syllabus? a) carefully b) skimmed c) nope 13 John D. Lamb, BYU Eating an elephant… Vocabulary Concepts Problem-solving skills 14 John D. Lamb, BYU From your 1 ChemTutor st Vocabulary (words and symbols): atom, proton, neutron, electron, nucleus, element, atomic number, atomic mass, isotope, mass number, ion, cation, anion, mole, atomic weight, periodic table, atomic symbol Would making flash cards help? 15 John D. Lamb, BYU From your 1 ChemTutor st Concepts: atomic structure chemical behavior depends on atomic number relating weights to numbers of atoms reading the periodic table 16 John D. Lamb, BYU From your 2 ChemTutor nd Vocabulary (words and symbols): significant figures, significant digits, precision, accuracy, exact numbers, measured numbers, uncertainty, scientific notation 17 John D. Lamb, BYU From your 2 ChemTutor nd Concepts: 18 correct # of sig figs proper use of “0” rules for counting sig figs reading the periodic table John D. Lamb, BYU From your 2 ChemTutor nd Problem Solving: counting sig figs writing numbers in scientific notation using sig figs in calculations (x&/ versus +&-) rounding 19 John D. Lamb, BYU What is the combined What weight of 1 mol of H atoms plus 1 mol of Li atoms? plus (a) (b) (c) (d) 20 7.94894 g 7.948 g 7.949 g 8g John D. Lamb, BYU Precision & Reproducibility Expressed partly in significant digits (e.g., 456) Shows HOW MUCH ± uncertainty E.g., 456 ± 2 We understand there is some ___________ in this digit. Common error: show too many significant digits 21 John D. Lamb, BYU How “significant” are significant figures? Chem 105: Chem more qualitative qualitative 22 Chem 106,7: Chem more quantitative quantitative Carry lots till you get to the answer— then round to correct sig fig’s (±1 sig fig in this class) John D. Lamb, BYU Accuracy ChemTutor talks mostly about precision (reproducibility when a measurement is (reproducibility repeated in the same lab by the same method) method) How do we decide if accurate? Repeat measurement by different method Repeat and/or by different people/lab. and/or 23 John D. Lamb, BYU The mole Useful in relating weights to numbers AW doesn’t represent a AW particular atom— weight of a lot of atoms; or in other units (not discussed here) of a hypothetical “average” atom “average” 24 John D. Lamb, BYU M&Ms and AW’s • M&M’s: Plain 5 g, peanut 7 g. M&M’s: • 100 candies • If all the same, easy—but what if some plain, If some peanut? • Ave? Depends on how many of each. Let’s say Ave? ave is 6.5 g. Which more abundant? • like AW—but can you pull out a 6.5 g M&M? 25 John D. Lamb, BYU The mole: 6.022 x 10 6.022 The 23 26 …or blades of grass John D. Lamb, BYU Chew on this: Convert 0.0065 to Convert scientific notation scientific -3 6.5 x 10 27 John D. Lamb, BYU Working with powers of 10 review next week when we do math review—schedule TBA by email 28 John D. Lamb, BYU Warm-Up Quiz—Example Warm-Up 29 No books or notes No collaboration (unless told otherwise) You can change your answer any number of times Correct answer = 2 points Incorrect answer = 1 point Max 8 points each day (min 5 questions) Totals normalized to 1.5/day at semester end highest 30 scores/40 count John D. Lamb, BYU How many moles of sodium (Na) atoms How are found in 46 g of sodium? are a) b) c) d) 30 1 x 103 5.0 0.05 2.0 Significant digits? John D. Lamb, BYU 31 John D. Lamb, BYU Learn by expressing opportunity to discuss with neighbor Don’t “zone out” ―get involved! LEARN! 32 John D. Lamb, BYU I have a balloon containing 1/6 mol He. have How many He atoms are in the balloon? a) b) c) d) 33 1023 4,000,000 0.01 1 x 1021 John D. Lamb, BYU Which weighs more… more… …a pound of lithium (Li) or a pound of lead (Pb)? Which contains more atoms? 34 2 samples with samples equal # of atoms equal • lead (Pb) • carbon (C) • Why the difference? (neighbors) What is the advantage of a What Li battery over a Pb battery? battery? 35 John D. Lamb, BYU • Don’t be afraid to ask questions. • very limited time for questions in very lecture lecture 36 John D. Lamb, BYU Models Our modern model of matter “quantized” Atoms: He and Au 37 John D. Lamb, BYU 38 John D. Lamb, BYU Be aware… -that the Angstrom is a unit of distance and amu a unit of mass -but we won’t use them in calculations on a test. What is wrong with this diagram from the text? 39 John D. Lamb, BYU My wedding ring contains ~33 g of gold My (Au)? How many gold atoms are in the ring? ring? a) b) c) d) 40 33 1/6 6.0 x 1023 1023 John D. Lamb, BYU Did you realize?... 41 These lecture PowerPoints are posted on Blackboard. also BLC Practice Sheet problems & answers Also detailed Practice Sheet keys (the day after they are due)—for macro-exam prep John D. Lamb, BYU Finito! Extra Handouts (Syllabus, Calendar, BLC’s)—please take. 42 John D. Lamb, BYU ...
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