# Register now to access 7 million high quality study materials (What's Course Hero?) Course Hero is the premier provider of high quality online educational resources. With millions of study documents, online tutors, digital flashcards and free courseware, Course Hero is helping students learn more efficiently and effectively. Whether you're interested in exploring new subjects or mastering key topics for your next exam, Course Hero has the tools you need to achieve your goals.

1 Page

### lab-7postlab

Course: CHEM 1310, Fall 2009
School: Georgia Tech
Rating:

Word Count: 340

#### Document Preview

Eichenblatt Sam Post Lab 7 A2 Jeff Culiver The goal of this experiment was to find the molecular weight of an unknown by measuring the change in freezing point when the substance is added into water. The change in temperature is related to the molecular weight by the equation DeltaT=Kw*m. Where Kw is a constant for water and m is molality which is moles/Kg of solvent. Using moles=mass/molecular weight we can...

Register Now

#### Unformatted Document Excerpt

Coursehero >> Georgia >> Georgia Tech >> CHEM 1310

Course Hero has millions of student submitted documents similar to the one
below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

Course Hero has millions of student submitted documents similar to the one below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.
Eichenblatt Sam Post Lab 7 A2 Jeff Culiver The goal of this experiment was to find the molecular weight of an unknown by measuring the change in freezing point when the substance is added into water. The change in temperature is related to the molecular weight by the equation DeltaT=Kw*m. Where Kw is a constant for water and m is molality which is moles/Kg of solvent. Using moles=mass/molecular weight we can substitute and have the final formula of: DeltaT=Kw((mass/molecular weight)/KgSolvent). Now there is a direct relationship between change in freezing point and molecular weight. The change in freezing point was not constant so we took the average of the two changes in temperatures. The calculations eventually ended up being closest to the molecular weight of Urea. Adding this substance to the water causes the freezing temperature to decrease. This is because of intermolecular interactions. Dipole-ionic interactions force the urea to disassociate in the water thus making the water harder to freeze The together. change in freezing point is directly related to the number of molality, and if there is a constant volume then the freezing point is related to number of moles. So the higher the ratio of moles to kg of solvent the greater the change in temperature. The change in freezing point was averaged to be 3.03 C. This correlated to the molecular weight of 32.74. This molecular weight is not close to any of the molecular weights listed in the table of possible unknowns. This is because for one of our trials our solution never froze, it only supercooled. This caused the change in temperature to be much higher than it actually was and forced the molecular weight to be much lower than the actual weight. Other errors could have been poorly calibrated equipment, poorly measured water or unknown weight, or human error in calculations. This experiment forced the student to understand the parts of the change in temperature equation and expanded his or her knowledge in freezing and boiling points
Find millions of documents on Course Hero - Study Guides, Lecture Notes, Reference Materials, Practice Exams and more. Course Hero has millions of course specific materials providing students with the best way to expand their education.

Below is a small sample set of documents:

Georgia Tech - CHEM - 1310
Quantum Mechanics- Window to Atomic Structure Sam Eichenblatt Having read the Georgia Institute of Technology Academic Honor code, I understand and accept my responsibility as a member of the Georgia Tech Community to uphold the Academic Honor Code at all
Georgia Tech - CHEM - 1310
Sam Eichenblatt A2 Discussion lab 8 The experiment that was preformed involved calculating the concentration of a solution using the absorbance of light. First the solutions were made with different levels of Fe3+ and SCN- then each solution was made and
Georgia Tech - CHEM - 1310
Sam Eichenblatt Chem 1310 A2 Lab 9 Topics 1) The strongest acid, with no surprise was the toilet bowl cleaner. The pH of this house hold item was a consistent 1 with every test taken. The strongest base was the ammonia. The two tests had pHs of 11 and 12.
Georgia Tech - CHEM - 1310
Sam Eichenblatt November 11th, 2009 Chem 1310 A2 Post lab discussion 10For the first part of the lab an unknown acid was titrated with a strong base to find the identity of the acid. The ph was recorded of the solution every .5 ml of base added. As expec
Georgia Tech - CHEM - 1310
Sam Eichenblatt Lab 11 Chem 1310 A2The first part of the experiment was, using the change in temperature when warm and room temperature water was added, calculating the Heat Capacity of the calorimeter. Using the equation q(hot water)=q(cold water)+q(cal
Georgia Tech - CHEM - 1310
Sam Eichenblatt Lab 11 Chem 1310 A2 Alexis WilsonPART A: CALCULATION OF THE HEAT CAPACITY OF THE CALORIMETER Trial 1: 20C 71C 45C 25, and 26 Trial 2: Average: 22C Standard Deviation: 85C 51C 29, and -34 8.37 36.06Initial Temperature Temperature of the H
Georgia Tech - PHYISCS - 2212
Bright yellow: original data; Pale yellow: calculated values (and units)Group Number: Awesome Names of lab group members: Last name Recorder Kovalenko Manager Eichenblatt Skeptic Clough Summarizer n/a Lab Section: PY205LFirst name Zoya Sam Daniel n/a Dat
Georgia Tech - PHYISCS - 2212
Fill in all colored fields. Bright yellow: original data; Pale yellow: calculated values (and graphs); Blue: cells to use for your graphGroup Number: N/A Lab Section: N07 Date: 2/18/2010Names of lab group members: Last name Recorder Kovalenko Manager Ei
Georgia Tech - PHYISCS - 2212
Fill in all colored fields. Bright yellow: original data; Pale yellow: calculated values (and graphs) Names of lab group members: Last name First name Lab Section: Date:Read the instructions before proceding. READ DATA ACCURATELY! A Data at two instants
Georgia Tech - PHYISCS - 2212
Fill in all colored fields. Bright yellow: original data; Pale yellow: calculated values (and graphs); Blue: cells to use for your graphGroup Number: Names of lab group members: Last name Clough Kovalenko Eichenblatt Lab Section: N07 Date: 4/1/2010First
Georgia Tech - COE - 2001
Georgia Tech - COE - 2001
NAME (print): GEORGIA INSTITUTE OF TECHNOLOGY School of Aerospace Engineering COE 2001 B QUIZ #2 (closed book exam)CraigF071. Cables AC and BC have a maximum allowable tension of 2600 N. Find the largest load, P, that can be applied, and determine the
Georgia Tech - COE - 2001
Georgia Tech - COE - 2001
Georgia Tech - COE - 2001
!!
Georgia Tech - COE - 2001
Georgia Tech - COE - 2001
NAME (print): GEORGIA INSTITUTE OF TECHNOLOGY School of Aerospace Engineering COE 2001 B QUIZ #3 (closed book exam)F8CraigF07B61. A truss is pinned at A and is attached by a frictionless cable to a pulley as shown. For the loading shown, determine
Georgia Tech - COE - 2001
Georgia Tech - COE - 2001
!!!
Georgia Tech - COE - 2001
COE 2001- STATICS AE2801 Special Topics Version 3NOTE: COE2001rox &amp; AE2801rox equal (3-0-3) credits Text: McGill &amp; King, Statics, 4th Ed., 2003Date 6/28 6/29 6/30 7/1 7/5 7/6 7/7 7/8 7/12 7/13 7/14 715 7/19 7/20 7/21 7/22 7/26 7/27 7/28 7/29 8/2 8/3 8/4
Georgia Tech - CHEM - 1310
Chapter 3 Stoichiometry 3.1 Atomic Masses 3.2 The Mole 3.3 Molar Mass 3.4 Percent Composition of Compounds 3.5 Determining the Formula of a Compound 3.6 Chemical Equations 3.7 Balancing Chemical Equations 3.8 Stoichiometric Calculations: Amounts of Reacta
Georgia Tech - CHEM - 1310
Chapter 4 Types of Chemical Reactions and Solution Stoichiometry 4.1 Water, the Liquid of Life 4.2 Aqueous Solutions: Strong and Weak Electrolytes 4.3 The Composition of Solutions 4.4 Types of Chemical Reactions 4.5 Precipitation Reactions 4.6 Describing
Georgia Tech - CHEM - 1310
Chapter 5 Quantum Mechanics and Atomic Theory5.1 Electromagnetic Radiation 5.2 The Nature of Matter 5.3 The Atomic Spectrum of Hydrogen 5.4 The Bohr Model 5.5 The Quantum Mechanical Description of the Atom 5.6 The Particle in a Box (skip) 5.7 The Wave Eq
Georgia Tech - CHEM - 1310
Chapter 6. Bonding6.1 Types of Chemical Bonds 6.2 Electronegativity 6.3 Bond Polarity and Dipole Moments 6.4 Ions: Electron Configurations and Sizes 6.5 Formation of Binary Ionic Compounds 6.6 Partial Ionic Character of Covalent Bonds 6.7 The Covalent Ch
Georgia Tech - CHEM - 1310
Chapter 8 GasesThe Gas Laws of Boyle, Charles and Avogadro The Ideal Gas Law Gas Stoichiometry Daltons Laws of Partial Pressure The Kinetic Molecular Theory of Gases Effusion and Diffusion Collisions of Gas Particles with the Container Walls Intermolecul
Georgia Tech - CHEM - 1310
Chapter 9 Liquids and Solids16.1 Intermolecular Forces 16.2 The Liquid State 16.3 An Introduction to Structures and Types of Solids 16.4 Structure and Bonding in Metals 16.5 Carbon and Silicon: Network Atomic Solids 16.6 Molecular Solids 16.7 Ionic Solid
Georgia Tech - CHEM - 1310
Chapter 10 Properties of Solutions17.1 Solution Composition 17.2 The Thermodynamics of Solution Formation (skip) 17.3 Factors Affecting Solubility 17.4 The Vapor Pressures of Solutions 17.5 Boiling-Point Elevation and Freezing-Point Depression 17.6 Osmot
Georgia Tech - CHEM - 1310
Chapter 11 Chemical Equilibrium 11.1 The Equilibrium Condition 11.2 The Equilibrium Constant 11.3 Equilibrium Expressions Involving Pressures 11.4 The Concept of Activity 11.5 Heterogeneous Equilibria 11.6 Applications of the Equilibrium Constant 11.7 Sol
Georgia Tech - CHEM - 1310
Chapter 12 Acids and Bases12.1 The Nature of Acids and Bases 12.2 Acid Strength 12.3 The pH Scale 12.4 Calculating the pH of Strong Acid Solutions 12.5 Calculating the pH of Weak Acid Solutions 12.6 Bases 12.7 Polyprotic Acids 12.8 Acid-Base Properties o
Georgia Tech - CHEM - 1310
Chapter 13 Applications of Aqueous Equilibria 13.1 Solutions of Acids or Bases Containing a Common Ion 13.2 Buffered Solutions 13.3 Exact Treatment of Buffered Solutions (skip) 13.4 Buffer Capacity 13.5 Titrations and pH Curves 13.6 Acid-Base Indicators 1
Georgia Tech - CHEM - 1310
Chapter 14 Heat, Work, Energy, Enthalpy1 The Nature of Energy 2 Enthalpy 3 Thermodynamics of Ideal Gases 4 Calorimetry 5 Hess's Law 6 Standard Enthalpies of Formation 7 Present Sources of Energy (skip) 8 New Energy Sources (skip)James Prescott Joule (18
Georgia Tech - CHEM - 1310
Chapter 15 - Spontaneity, Entropy, and Free Energy1 Spontaneous Processes 2 The Isothermal Expansion and Compression of an Ideal Gas 3 The Definition of Entropy 4 Entropy and Physical Changes 5 Entropy and the Second Law of Thermodynamics 6 The Effect of
Georgia Tech - CHEM - 1310
CHAPTER 161. 2.(pages 776-792)3.4.5.Oxidation and Reduction Galvanic Cells, Half Reactions (E anode &amp; Ecathode) Standard Reduction Potential (E ) Nernst Equation, and the dependence of Potential on Concentration Relationship between9/8/10 11REDOX
Georgia Tech - CHEM - 1310
Click to edit Master subtitle style9/8/10CHEMICAL KINETICS CHAPTER 17, Kinetics 11Kinetics vs Thermodynamics A: Reactants B: Transition state C: products E: Forward Activation Free Energy F: Reverse Activation Free EnergyKeKinClick to edit Master sub
Georgia Tech - CHEM - 1310
Freezing Point Depression to Determine Molar Mass 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 A B C Chem1310 Name
Georgia Tech - CHEM - 1310
Types of Chemical ReactionsExcel TemplateA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60BCDEFGHIJKLChem 1310 Exp. 06
Georgia Tech - CHEM - 1310
Georgia Institute of Technology School of Chemistry and Biochemistry CHEM 1310: General Chemistry Exam 1 23 September 2009Print Name:_Last Name_First NameTeaching Assistant _Section _&quot;Having read the Georgia Institute of Technology Academic Honor
Georgia Tech - CHEM - 1310
Chem.1310Spring2008FinalExamVERSIONBProfessorsWilliams/WhettenName_SectionNumber_There are 69 questions on this exam. It is closed note/book. One 8.5 x 11 handwritten crib sheet (two-sided) is permitted. Please turn off your cell phone. Use a #2 pencil
Georgia Tech - CHEM - 1310
Chem. 1310 Fall 2005Final Exam-whiteDecember 15, 2005Professor WilliamsName _ Section Number _ Please read the following before proceeding 1. On the Scantron card, you must bubble-in your GTid number. In the space provided, write your Name. Write the
Georgia Tech - CHEM - 1310
Georgia Institute of Technology CHEM 1310: Exam II October 21, 2009Select the best answer for each of the following problems. Each problem is worth 5 points with no partial credit.1. A solution is prepared by dissolving 49.3 g of KBr in enough water to
Georgia Tech - CHEM - 1310
CHEM 1310 A/B: General Chemistry Georgia Institute of Technology Exam 3, Chapters 13 - 15 November 18, 2009 Williams SectionLastName FirstNamePrintName:_ TeachingAssistant_Section_ &quot;HavingreadtheGeorgiaInstituteofTechnologyAcademicHonorcode,Iunderstan
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
QTPSXWVVPSPSR UCFBEHHHIBEBED G363655@9@22A85522554 2 7 24 736#&amp;#&amp;5&quot;%&quot;%0)021(5&quot;%&quot;%25&quot;%&quot;%4 2 7\$ '\$ '!! 8A7@C7@7@9 B34(1(1'0'035'0'0%3'0'06)
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Georgia Tech - CALC 2 - 1502
Name Teaching Assistant Math 1502 E Andrew11 February 2010 Hour Test 1Instructions: 1. Closed book. 2. Show your work and explain your answers and reasoning. 3. Calculators may be used, but are by no means necessary. Pay particular attention to instruct
Georgia Tech - CALC 2 - 1502
Name Teaching Assistant Math 1502 J Andrew11 February 2010 Hour Test 1Instructions: 1. Closed book. 2. Show your work and explain your answers and reasoning. 3. Calculators may be used, but are by no means necessary. Pay particular attention to instruct
Georgia Tech - CALC 2 - 1502
Name Teaching Assistant Math 1502 E Andrew18 March 2010 Test 2Instructions: 1. Closed book. 2. Show your work and explain your answers and reasoning. 3. Calculators may be used, but are by no means necessary. Pay particular attention to instruction 2. T