CHM 210 Chemistry 1 Kansas State University Lab Exam 1 Review Guide 25 questions 50 points Fall 2014 3 November 2014 7 30 8 45 pm The exam is at 7 30 pm on Monday 3 November 2014 in the same room where you take your lecture exams The exam consists of 25 multiple choice questions worth two points each It covers lab safety and Labs 1 6 The same general rules and calculator rules from the lecture exams apply to the lab exam The front page of the exam includes a periodic table and the following equations and constants density mass volume A log T A RC 1 ppm 1 mg L c Ephoton h c 2 9979 108 m s h 6 626 10 34 J s 1 mole 6 022 1023 particles E R 1 2 n 1 RH 2 1788 10 18 J 1 2 n 2 H 1 nm 10 9 m For each lab study its introduction in the lab manual pre and post lab questions and calculations questions and analysis related to the data collected The key is to truly understand what you did and why you did it You should actively work problems as you study not just passively look at problems you worked before Lab 0 Check in and Safety G know and follow lab safety rules in the lab manual in the safety contract or explained by your TA Lab 1 Measurement and Density G know basic metric or SI units and the meaning of the common prefixes such as milli attached to them G determine the correct number of significant figures for the answer of any calculation G understand density calculations concepts and units solve for any unknown variable G measure the density of liquids and of regularly shaped and irregularly shaped solids G use a graph and or the equation of its best fit line to find an unknown y from a given x or vice versa G calculate an object s percent composition based on densities such as the Cu and Zn in a penny G given density mass and some dimensions of an object calculate its other dimension e g thickness of Al foil Lab 2 Light and Atomic Spectra G know the electromagnetic spectrum and its relationship to energy particularly in the visible region G understand calculations and concepts relating the speed of light frequency and wavelength G given frequency or wavelength calculate the energy of a single photon or the energy of a mole of photons G understand concepts related to atomic spectra G calculate the energy change for electrons in an H atom changing energy levels n2 n1 G determine electron configurations of atoms and ions including transition metals d block elements Lab 3 Spectrophotometry G know the relationship between absorbance and transmission of light in a spectrophotometer G understand the relationship between the color absorbed and the color transmitted e g using a color wheel G know how a colored sample s concentration affects transmission and absorbance of light passing through it G make a spectrophotometer calibration curve with knowns and use it to find an unknown s concentration G calculate the absorbance A of a sample from measured transmission T data for that sample G use Beer s law A RC to relate experimental measurements or calculate an unknown value G choose the optimum wavelength or color of light to analyze a particular sample Lab 4 Empirical Formula of Copper Chloride G calculate the percent composition of a compound from mass data or from the compound s chemical formula G determine an empirical formula using lab data such as data from the copper chloride procedure G determine which reactant is limiting or excess using visible evidence observed during a reaction G understand how common experimental errors will affect the result of an empirical formula determination G understand how the amount of sample used will affect the result of an empirical formula determination Lab 5 is new for Fall 2014 You are not responsible for topics from the old Lab 5 that are on past lab exams such as water hardness titration with EDTA reading a buret Ca2 concentration and the efficiency of ion exchange columns Lab 5 Water Quality G prepare a calibration curve using spectrophotometer data for colored samples of known concentration G use a calibration curve or the equation of its best fit line to find the concentration of an unknown sample G know the relationship among the following concentration units ppm mg L and g mL G given the concentration of nitrate or phosphate measured in ppm convert it to molar concentration mol L G given molar concentration mol L of nitrate or phosphate convert it to the equivalent concentration in ppm G know reasons nitrate and phosphate are beneficial and harmful in the environment on land and in water If a past semester s Lab Exam 1 only covered Labs 1 5 you must look at Lab Exam 2 for sample questions from Lab 6 Lab 6 Molecular Geometry and Molecular Visualization G draw Lewis structures for given molecules and ions showing all bonds and lone pairs of electrons G understand when resonance structures are relevant and draw their Lewis structures G determine the central atom hybridization electron pair geometry and molecular geometry G determine the formal charge on any atom in a molecule G determine the polarity of individual bonds in a molecule and the resultant overall molecular polarity G know the typical bond angles for each molecular geometry know how lone pairs affect these angles