Chemistry 1451, UCA Desrochers

Chemistry 1451, College Chemistry II training show

Patrick Desrochers Spring 2008
Lecture: (Laney 104) MWF 10:00 – 10:50 am Lab: (Laney 206): Th 10:50 am – 1:30 pm or 2:40 – 5:30 pm

Office hours (drop-in times): M 3 – 4 pm, W 1 -3 pm, Th 9:30 – 10:30 am, F 9 - 10 am For other times, contact me to check availability.

Daily Board Lists	lecture aids	goggle styles
Spring 2008 Syllabus	Chem I Review Quiz	Motivation
Laboratory download and prelab advice	ACS Student Affiliates Chem Tutoring	grade calculation example
PRS Clicker registration, grading	Undergrad. Studies Tutoring	Lab Practical Exam

(.pdf format, download Adobe Reader for free to read pdf files) Graphing assignment linked here due Wed January 16 in lecture.

Recent Chem 1451 exams (Fall 2000) (.pdf format)

Spring 2008 final exam review sheet

These exams are best used as practice exams. After studying for the exam, allow 50 min (2 h for the Final) and work the exam using only a pencil/pen, calculator, and a periodic table. You may check your answers with me after you have completed the practice exam. This service only works if you plan ahead, several days prior to your actual exam.

Review From
Chem 1450

YOU MUST HAVE EARNED A C OR BETTER IN CHEM 1450 TO TAKE THIS COURSE.
More importantly, a thorough understanding of the following

Chem 1450 topics is critical to your success in this course:

Review

Quiz Topics

ion and compound formulas (Ch 2,3) thermodynamics (Ch 8)

stoichiometry (Ch 3,4) periodic properties (Ch 5,6)

molarity (Ch 3) molecular structure and intermolecular forces (Ch 7)
net ionic equations (Ch 4)

Chapters and problems refer to Chemistry, 4^th Ed. by McMurry and Fay.

Study for the Chem I review quiz to be given Tues July 10 by working the following end-of-chapter questions:
See me during office time well in advance of this date with any questions about this review material.
            Ch 2: 78-80,83-87                                           Ch 6: 48
            Ch 3: 11,12,64,68,69,80, 88,90                       Ch 7: 9-13,75-77
            Ch 4: 4,82,86,89                                             Ch 8: 13,15,16,20
            Ch 5: 82-86
The formulas and charges of major polyatomic ions must be memorized. These are listed in Tab. 2.3 p 61.

Laboratory Handout Downloads and Prelab Advice
Most handouts linked below are in .pdf format and are readable using Adobe Reader. This standard plugin is free over the internet.
You should print and read these well in advance of the scheduled lab activity.

Experiment	Prelab Advice, downloads available
Graphing assignment	I will introduce this activity during lab, but you will complete it outside of class. See me during office time for help.
PROP 515	As written. Electronic graphs are encouraged, but you can do these by hand if you wish.
ANAL 360	4. See that the reaction indicates 1:1 mole ratio between the colored complex and glucose. Electronic graph preferred for this one including a best fit line with y = mx + b reported. In general, remember that [ ] à moles à grams. The prelab ultimately is looking for grams, but this is obtained using concentration and volume (and this gives moles). Remember too the dilution idea (Sec. 3.8). Each of the five standards is a diluted version of the original stock glucose for which information is given. For example: soln 1 is made by diluting 5.00 mL of the stock to 100.00 mL. The dilution equation indicates the way that the dluted concentration may be calculated. M_stockV_stock = M_diluteV_dilute
THER 512	4(b). K_sp TlCl = [Tl⁺][Cl^-], plug in the appropriate values from part (a). Bring this handout to lab.
KINE 504	Prelab hints: Question 2. As you can see from the [ ] vs time data this requires a graphical determination of reaction order approach. This can be done easily on a computer spreadsheet. (d) Rate law = rate expression = rate equation, three ways of saying the same thing. Question 3. These data look like rate vs [ ] data, requiring the relative rates method to determine the reaction order. Print this figure showing the structure of crystal violet and a related dye, malachite green.
EQUL 404	Print this outline table for use in lab (it may work best if printed in landscape mode) Q3. In each case, one of four things is happening * Product is being added directly * or product is being removed (via reaction with something that is being added) * or reactant is being added directly * or reactant is being removed (via reaction with something that is being added) The color change anticipated is either more yellow or more orange as a result of the equilibrium shifting in response to one of the four stresses listed about. Q3 (6) Is an example of something being removed as a result of the added reagent. Because NaOH is a base, it reacts with _______ in the equilibrium, effectively removing it. The net ionic equation they want is just the reaction of NaOH with _______ in the equilibrium.
EQUL 343	Read this carefully and bring it to lab Hints on some prelab questions Q1. We have already used Spec 20’s to record absorbances during the crystal violet kinetics experiment. Q3. Use equation 7. During lab we will measure Absorbance directly. The reason for all this A vs %T dates to older Spec 20’s that had analogue needle and not digital readouts as we have today. %T is a linear scale and easier to read if one has only a needle. However, A is directly proportional to concentration and the more desirable parameter to have for quantitative work. Q4. In both cases the concentrations are diluted from their original values. Remember that during dilutions moles in overall diluted sample = moles present in portion of concentrated sample that was diluted Or using molarities (M_diluted)(V_diluted) = (M_conc)(V_conc)
ANAL 902	Print this Laboratory investigation outline for ANAL 902 Also print this data table for use in lab. Q6 requires a density for the vinegar solution. Use a value of 1g/mL, close to the value of water.
EQUL 487	3. Two different things are going on here. At one point the idea is to measure an undiluted solution volume. At the other point, the key idea is to determine moles. Are moles of HT ^- affected by extra water? 4. Set up an ICE chart to organize this one. KHOx(s) = K⁺(aq) + HOx ^-(aq) Initial [K⁺]_initial 0 Change x x and x = [K⁺]_from_diss = [HOx ^-]_{sat. soln} --------------------------------------------------------------- Equil [K⁺]_initial+ x x x = [HOx ^-]_sat_{. soln} comes from the titration of this weak acid by NaOH.
Making Buffers	Entire experiment including prelab is linked here. For Q3 of the prelab use Tables 15.2 and 15.4 in the text.
Redox Balancing	Print this worksheet for use in lab There is no prelab to hand in. However, read the required sections mentioned on the handout, and complete as much of the handout as you can before coming to lab. We will complete the worksheet during lab, handing it in at the end of the period.
ELEC 450	Be certain to provide balanced reactions and half reactions when prompted to give reactions. 3. Consider the potentials for the oxidation of Ag and for the reduction of Al⁺³ to answer this question.