Name: Patrick Morefield Date: December 06, 2006 Lab Partner: Gabriel Rodriguez Unknown No. : 941 Report Sheet Colligative Properties: Freezing-Point Depression and Molar Mass |1. |Volume of cyclohexane |10..1mL | |2. |Mass of empty insulated test tube and spin bar |345.47g | | |Mass of stir bar, tube and cyclohexane |353.10g | | |Mass of cyclohexane |7.63g | |3. |Mass of insulated test tube, spin bar, cyclohexane and |353.25g | | |unknown | | |4.
Lab 4 – Energy Sources and Alternative Energy Experiment 1: The Effects of Coal Mining |Table 1: pH of Water Samples | |Water Sample |Initial pH |Final pH (24-48 hours) | |Pyrite |5 |6 | |Activated Carbon |6 |7 | |Water |5 |5 | POST LAB QUESTIONS 1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water? a. Pyrite hypothesis = Pyrite will contaminate the water source making it more acidic. b. Coal hypothesis = Coal will contaminate the water source making it more acidic.
It was discovered that the mean life was 362 days and the sample standard deviation was 10 days. The research department decided to conduct the test at the 0.05 level of significance whether the modification actually increased the life of the AAA battery. What was their decision rule? A. Reject the null hypothesis if computed z is 1.96 or greater.
pyridinium hydrobromide perbromide type of stationary phase column length column temperature rate flow of the carrier gas List the 4 general factors that affect the separation obtained on a gas chromatograph What specific technique is used to collect/isolate your purified unknown compound at the end of the recrystallization experiment? suction filtration 14 of 22 4/16/12 9:15 PM StudyBlue Flashcard Printing of Lab Final 2211L UGA
A student calculated the theoretical yield of barium sulfate in a double replacement reaction experiment to be 1.35 g. When she filtered, dried and weighted her solid (precipitate), however, her yield was only 1.29 g. Calculate the student’s percent yield. 3. Before going to lab, a student reads in his lab manual that the percent yield for a difficult reaction to be studied was likely to be only 40% of the theoretical yield. The student’s pre-lab stoichiometric calculations predict that the theoretical yield should be 12.5 grams. What is the student’s actual yield likely to be?
If the reaction is not spontaneous under standard conditions at 298K, at what temperature (if any) would the reaction become spontaneous? a) 2 PbS (s) + 3 O2 (g) → 2 PbO (s) + 2SO2 (g) ; ΔH° = -844 kJ; ΔS°= -165 J/K b) 2 POCl3 (g) → 2 PCl3 (g) + O2 (g) ; ΔH° = 572 kJ; ΔS°= 179 J/K 5. Consider the reaction H2 (g) + F2 (g) → 2 HF (g). a) Using data in your Appendix B, calculate ΔG° at 25°C b) Calculate ΔG at 298K if the reaction mixture consists of 8.0 bar of H2, 4.5 bar of F2 and 0.36 bar of HF. 6.
Ideal Gas Behavior Instructor: Nieves Montano Chem 151, Section 002G Date Work Performed: February 12, 2014 Date Report Submitted: February 20, 2014 Abstract: This paper reports a lab experiment done on the ideal gas law to determine differences in gas based upon their “R” constant difference to 0.082057. A total of seven gases were tested, which included, Ethanol, Hexane, Cyclohexane, Pentane, Ethyl Acetate, Butane and Acetone. These gases were each heated and then condensed to liquid gas to find specific values and determined Ethanol as the gas closest to ideal behavior in this experiment. Introduction: The Ideal Gas Law demonstrates the relationship of the properties of gases. This relationship is specific to the gases that are considered “ideal”.
Ocean County College Department of Chemistry Ionic Reactions Submitted by XXXX Date Submitted: July 11, 2014 Date Performed: July 9, 2014 Lab Section: Chem-180 DL Course Instructor: L. Stage Purpose The purpose of this experiment is to: -write balanced equations -study ionic reactions -write net ionic reactions Procedure -In the 96-well plate -place 2 drops of cobalt (II) nitrate into seven of the A wells -place 2 drops of copper (II) nitrate into seven of the B wells -place 2 drops of iron (III) nitrate into seven of the C wells -place 2 drops of the barium nitrate into seven of the D wells -place 2 drops of nickel (II) nitrate into seven of the E wells -The next drops go in the numbered columns -place 2 drops of sodium phosphate into five vertical wells under 1 -place 2 drops of sodium iodide into five vertical wells under 2 -place 2 drops of sodium sulfate into five vertical wells under 3 -place 2 drops of sodium chloride into five vertical wells under 4 -place 2 drops of sodium bicarbonate into five vertical wells under 5 -place 2 drops of sodium carbonate into five vertical wells under 6 -place 2 drops of sodium hydroxide into five vertical wells under 7 -After I was done with the exercise, I cleaned up and put away my LabPaq. Observations and Results le | Negative Ions (Anions) | Positive Ions (Cations) | Solubility of Compounds | All negative ions are _____ with | Alkali ions | Soluble | All negative ions are _____ with | Hydrogen | Soluble | All negative ions are ______ with | Ammonium Ions | Soluble | Nitrate NO3 - ions are _________ with | All positive ions | soluble | Acetate CH3COO- ions are ______ with | All positive ions | soluble | Chloride, Cl- Bromide Br- Iodide I- | AG+, PB ^2-, HG2^2+, CU+All other positive ions are | Insolublesoluble | Sulfate SO4 2- |
Sadman Binzaman Experiment 1: Methods for the determination of density Wednesday, September 7th, 2011 11:30 AM – 2:50 PM Post Lab Questions 1. How would you determine the density of gas? Density is measured by dividing the mass of the substance by the volume of the substance. First measure the mass of the empty container and then measure the mass of the container with the gas inside. The difference between the two measurements should give you the mass of the gas alone.
45 minutes IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI N05/4/PHYSI/SPM/ENG/TZ0/XX+ 88056504 PHYSICS STANDARD LEVEL PAPER 1 Thursday 17 November 2005 (afternoon) INSTRUCTIONS TO CANDIDATES • Do not open this examination paper until instructed to do so. • Answer all the questions. • For each question, choose the answer you consider to be the best and indicate your choice on the answer sheet provided. 8805-6504 18 pages –2– 1. N05/4/PHYSI/SPM/ENG/TZ0/XX+ The mass of an atom of the isotope strontium-92 (92Sr) is of the order of A.