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# H CHEM 145

UW

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This 5 page Class Notes was uploaded by Carmela Kilback on Wednesday September 9, 2015. The Class Notes belongs to CHEM 145 at University of Washington taught by Staff in Fall. Since its upload, it has received 15 views. For similar materials see /class/192598/chem-145-university-of-washington in Chemistry at University of Washington.

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Date Created: 09/09/15

CHEMISTRY 145 PLACEMENT EXAM INFORMATION Entrance to Chemistry 145 honors general chemistry is by entry code only With two exceptions all students must take and pass the CHEM 145 placement exam Sample exam questions follow the listing of study materials The exam is given in The Of ce of Educational Assessment 440 Schrnitz Hall 5431170 at the following times on a space available basis M 0nday Tuesday Thursday 1 00 pm and 300 pm Wednesday and Friday 1030 am These testing times are effective June 14 October 8 2004 This exam may be taken twice different versions with a twoweek waiting period required for study and re ection Students may take up to 60 minutes to work the exam A periodic table and useful formulae will be provided Bring a nonprogrammable hand calculator that is one that does the usual mathematical operations plus log 1n exp and powers of 10 but has no permanent memory or programming capabilities Such calculators cost 1015 Exceptions Students with a 4 or 5 AP score may directly contact the chemistry advisers in 109 Bagley 1adviserschemwashingtonedu to register for CHEM 145 Such students will be given a review problem set to work before classes start Note that AP scores should be on le with the Of ce of Undergraduate Admissions before students may be registered for CHEM 145 Students may also present an unof cial copy of their AP scores to the chemistry advisers for veri cation of their score Similar rules apply to IE scores on the High Level chemistry exam with a 5 6 or 7 allowing immediate admission to Chem 145 Note that the Chemistry Faculty encourages all AP and IB students to enter the Honors program which runs for three full years rather than skipping ahead in the nonhonors sequence Students in the EEP and Academy Programs who plan to enter CHEM 145 will be given tentative admission subject to con rmation on successful completion of the July Academy ChernPrep course Prerequsites for Chemistry 145 Note that what is desired is familiarity with and a working knowledge of the following elementary parts of chemistry and associated mathematical concepts rather than a broad coverage of all topics in a full year of high school or AP chemistry These topics will NOT be reviewed in Chemistry 145 although they will be needed for solution of problems and to follow lecture materials starting on day one The Atom Atomic constituents electrons protons neutrons nuclei isotopes Atoms and atomic 77 rons The mole or gramatom Avogadro s Number atomic masses conversions from AMU to grams and Kg names of the atoms The Periodic Table Groups of elements periods periodicity the representative elements amp their natural states of occurrence in nature eg hydrogen oxygen nitrogen uorine all occur as diatomic gases at room temperature and pressure these being the elements through argon Lewis dot structures for atoms amp ions shell structure Molecules and Compounds Molecular formulae empirical formulae combining ratios by weight and number compositions molecular weights formula weights Lewis structures of simple molecules ionic and covalent multiple bonds and molecular ions names of simple compounds and common molecular ions eg uoride phosphate carbonate Chemical Reactions amp Stoichiomet Balanced chemical equations at the bulk and atomicmolecular levels weight and mole relations yields limiting reagents Measures of concentration in solution composition of solutions solution stoichiometry Examples of simple types of chemical reactions precipitations amp solubility rules simple acidbase neutralizations recognition of simple strong acids and strong bases oxidation reduction reactions assignment of oxidation numbers to individual elements in representative compounds Solids Liquids Gases and Phase Transitions Temperature coefficients thermal expansion densities Standard Boiling and Freezing points of pure substances The empirical ideal gas laws Charles s Law Boyle s Law the Avogadro Hypothesis The universal ideal gas equation of state PV nRT Mathematics and Problem Solving Familiarity with logarithms the exponential function scienti c notation signi cant gures unit conversions solution of coupled linear and quadratic equations extraction of information from graphs slopes and intercepts of straight lines tangents to curves are all assumed As calculus is a corequisite understanding of the notion of derivatives as tangents and integrals as areas under curves will be helpful Zumdahl appendices 12 and Oxtoby appendices ABC below both have substantive appendices covering the more elementary mathematical prerequisites Where to nd review help if needed A solid course in high school chemistry will normally cover the above materials Check your problem solving abilities by working the sample problems below If you took chemistry in the 11th grade and it s now a year later you will de nitely want to review the above topics These materials are also contained in any standard college level text such Zumdahl currently used in nonhonors general chemistry at the University of Washington Zumdahl Chemical Principles 4 11 Edition Houghton Mifflin Chapters 14 and Sections 15 of Chapter 5 This is a nice text for review or selfstudy as the text s organization is essentially in the order of topics above Note as Zumdahl is the general chemistry text at UW and many of the local Community Colleges that new and used copies are readily available Or A college text often used in AP chemistry courses Brown LeMay Bursten Chemistry the Central Science 9 11 Edition Prentice Hall Chapters 14 parts of Ch 7 and the elementary discussion of Lewis structures in Ch 8 Sections 15 and gases Chapter 10 Sections 16 The coverage here is ne but the topics are introduced in a rather different order Or At a more advanced level this material and more is contained in c Oxtoby Gillis Nachtrieb Principles of Modern Chemistry 5 11 Edition Thompson BrooksCole Chapters 13 Sections 14 of Chapter 4 for gases Sections 13 of Chapter 6 for solutions and typical chemical reactions OXtoby is the textbook for Chemistry 145 and discussion of the elementary topics listed above will not be eXplicitly covered in lecture although they will often appear in the conteXt of discussion of more advanced material and in assigned problems Note that the OXtoby coverage is above the level of the elementary prerequisites and that many other concepts and examples appear in the above chapters Sample chemistry problems note that on the actual exam questions will be multiple choice so the style and format will be somewhat different The sample problems below are intended to give a feel for coverage and level of dif culty to be expected 1 note that not all parts of this question require solution of prior parts a How many moles of 02gas are required for complete combustion of one mole of cyclopropane C3H5 to give C02gas and H20liq b What weight in grams of C02 would result c Draw Lewis structures for all four of the molecular species mentioned in part a d What is the bond order of 0 in C02 and in 02 e In an Oxygen de cient environment C0 gas rather than C02gas is produced If only one gram of 02 were available how many grams of C0 could be produced f What is the bond order of 0 in C0 gWhat would the volume of this COgas be at STP h How many molecules of C0 would be formed i What is the mass in grams of one ofthese molecules 2 a What minimal number of grams of NaCl would it take to precipitate all of the silver in 200mL of an 02M solution of AgN03 in water assuming the reaction goes to completion b Write a balanced net ionic equation for the above chemical reaction c If ltered and dried how many grams of wha precipitate could be isolated d Draw a Lewis diagram for the molecular ion N0339 How many equivalent resonance structures are there 3 Classify the following reactions as neutralizations oxidationreduction a PbN032 NaI 3 NaN03 PbI2 in water solution b H2804 NaOH 3 NaHSO4 H20 in water solution c Cgraphite solid 02gas 3 C02gas gt7 4 precipitations or d In the case of an neutralization identify the acid and base species in the case of an oxidationreduction reaction give the oxidation numbers of all elements in all of the reactant and product species and state which elements are oxidized and which reduced in the case of a precipitation write a balanced net ionic equation for the reaction and name the precipitate Sample Math Problems 1 The speed of light is 3 x 1010 cmsec in a vacuum What is this speed in furlongsfortnight One fortnight is 2 weeks and there are 8 furlongsmile A US or British statute mile is 5280 feet a foot contains 12 inches linch 254cm exactly 2 A lake of constant depth has a surface area of l kmz It contains 1016 kg of water i How deep is the lake The density ofwater may be taken to be 1 ii What mass of water kg would a lake of half the depth but four times the surface area contain 3 Determine all the roots ofthe cubic x3 7 2x2 7x 2 0 Hint x 71 is a factor 4 Below is a graph of actual distance from Seattle as measured along the roadway in km as a function of time in hours on a car trip from Seattle to Spokane which is 500 km from Seattle along the road taken The trip began at 9am Seattle time Following the graph are several questions usmnoe anm a Estimate the average speed in kmhour over the duration of the entire 6 hour trip b What do you think happened one hour into the trip c Estimate the instantaneous speed at 5 hours into the trip Was this above the likely speed limit 75mph d At what time interval in the trip to the nearest 15 minutes was the speed a maximum e At what point or interval between hours 25 and 5 hours was the speed a minimum f What were the occupants likely doing at 35 hours into the trip

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