Christina Hang Vanessa Hang Seng Xiong Period 5 December 14‚ 2012 Molecular Mass by Freezing Point Depression Objective: Determine the molecular mass of an unknown substance by finding the change in freezing point of a solvent when the unknown substance is dissolved in it. Qualitative Data: Trials BHT (g) Cetyl –Alcohol (g) Unknown substance (g) Melting Temperature 1 0.48 g 0 0 69.3 2 0.46 g 0.09 g 0 66.9 3 0.49 g 0 0.11 g 53.7 Analysis: 1.) Determine ___ for the solution of cetyl
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NOT FOR ELECTRONIC STUDENT ACCESS ONLY FOR CLASSROOM USE!! Unit 9: Stoichiometry Practice 1. Differentiate between the significance of the coefficients in a balanced chemical equation and the significance of the subscripts in a chemical formula. · Coefficients show the correct proportions of atoms and molecules in a chemical reaction. They are normal sized numbers placed at the beginning of the chemical formulas in a chemical reaction during the process of balancing. They tell how many of an entire
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Angela Pierre Chem 112 Lab Due: 03/05/2015 Lab Report 14 Questions 1. Part A.3. Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high‚ too low‚ or unaffected? Explain. -The freezing point will be higher because the loss of solvent means that the molarity of solute is too high. The melting point will be lower than expected. 5. Part B.2. The solute dissociates slightly in the
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Problem Statement: Chem-Med Company is positioned strongly in its industry to achieve high growth and earn large profits in the future‚ but it is in need of financing. To secure this financing‚ Chem-Med must address concerns of potential financers and investors regarding liquidity‚ efficiency‚ cash flow‚ and the need for funding despite apparent growth. In addition‚ Chem-Med’s primary competitor‚ Pharmacia‚ is out-competing the company and stealing valuable market share and sales volume with lower
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Philippine Science High School-Central Luzon Campus (S.Y. 2014-2015) CHEMISTRY 1 QTR 3 POST-LAB REP 1 Alessandria Maeve M. Ocampo | 9-Samat | January 5‚ 2015 RESULTS AND DISCUSSION Solubility is the ability or property of a certain solute to dissolve in a particular solvent. [1] Miscibility‚ on the other hand‚ is the ability or property of substances to mix in all proportions or thoroughly. This term is usually used in the mixing of liquid substances. [2] In the experiment‚ the students observed
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Identifying a Salt by Creating its Heating Curve Introduction: Solubility is a substance’s ability to be dissolved in a liquid‚ usually water‚ and some substances are more soluble than others. A solution can be saturated‚ unsaturated or supersaturated. Temperature plays a large role in the solubility of substances. For example‚ on table G of the Chemistry reference tables it shows that 10g of KClO3 will dissolve in 100g of water at about 25°C‚ but at about 48°C‚ 20g will dissolve. The higher the
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MoonChem Case The vice-president of Moon Chem‚ a manufacturer of speciality chemicals would like to conduct a study on the policy of providing consignment inventory to its customers in the Midwest region. The aim of this study is to analyze different options for distribution available in the Peoria region and to conclude with the optimal distribution policy. Successful results following this study would allow the company to introduce the consignment inventory strategy nationwide. A careful study
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question and answer book is provided with this data book. Students are NOT permitted to bring mobile phones and/or any other unauthorised electronic devices into the examination room. © VICTORIAN CURRICULUM AND ASSESSMENT AUTHORITY 2012 2012 CHEM DATA BOOK 2 Table of contents page 1. Periodic table of the elements 3 2. The electrochemical series 4 3. Physical constants 5 4. SI prefixes‚ their symbols and values 5 5. 1H 6.
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Enthalpy changes can be calculated using average bond enthalpy data. i) The enthalpy change to convert methane into gaseous atoms is shown below. [pic] Calculate the average bond enthalpy of a C—H bond in methane. [1] ii) Use the data in the table below and your answer to (a)(i) to calculate the enthalpy change for [pic] [3] [pic] b) The standard enthalpy of formation of 1‚2-dibromoethane‚ CH2BrCH2Br‚ is – 37.8 kJmol-1. Suggest the main reason for
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Worked solutions to student book questions Chapter 2 Analysis by mass Q1. a b Why was the soup sample in Worked Example 2.1 heated to 110°C? Why was it necessary to weigh the sample four times? A1. a b The soup was heated above 100°C to evaporate water from the sample. By repeatedly heating the sample until the mass remained unchanged‚ the analyst could be sure that all the water had been removed. Q2. Some laboratories use microwave ovens in place of conventional ovens to
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