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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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 the difference between this value and your
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SUBMISSION INSTRUCTIONS: WHAT: Printed questionnaire with the answers written in a big yellow booklet. One page per number. Paginate each page accordingly. Use different inks to distinguish the bonds of electrons for numbers involving molecular structure. WHO: All students with Student Number ending in ODD number will answer Set A while students with Student Number ending in EVEN number will answer Set B. Indicate your Student Number and the Set you are answering in front of the yellow
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Biomolecules Polymers Chemistry in Everyday life 4 5 5 5 4 3 8 5 3 4 4 6 4 4 3 3 Total B. 70 Weightage to form of questions S.No. Form of Questions 1. 2. 3. 4. Long Anwer Type (LA) Short Answer (SAI) Short Answer (SAII) Very Short Answer (VSA) Total Marks for each question 5 3 2 1 No. of questions 3 9 10 08 Total Marks - 30 70 (1) 15 27 20 08 C. Scheme of Options 1. 2. D. There will be no overall option.
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The order of presentation is strongly recommended by the National Mathematics and Science Initiative (NMSI) UNIT 1 Foundations / Nomenclature / Stoichiometry (Summer Work and Introductory Review) these topics are all covered in College Prep and Honors Chem Chapter 1 Introduction: Matter and Measurement 1.1 The Study of Chemistry The Atomic and Molecular Perspective of Chemistry 1.2 Classifications of Matter States of Matter Pure Substances Elements Compounds Mixtures
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Part One (Flame Test): 1. Create and complete a data table for Part One of the lab. It should include the name of the element (or unknown) examined and the color of the observed flame Solution Name Color description 1 Barium Lime green 2 Calcium Red 3 Sodium Yellow 4 Rubidium Purple 5 6 Potassium Lithium Blue Pink Unknown 1 Sodium Yellow Unknown 2 Potassium Blue 2. Identify each unknown from Part One of the lab and briefly explain why you identified each unknown as you did. Unknown 1 was sodium
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Biochemistry and Technology 8.06 What specific topic did you choose to research and evaluate? (2 points) -I chose genetic engineering/recombinant DNA technology/transgenesis of biotechnology to research and evaluate because that interests me the most‚ personally. List the resources that you used in your research of your topic. (3 points) - I used sites such as‚ wikipedia.org‚ and slideshare.net. Describe‚ in a few paragraphs‚ the biotechnology that you researched. How is it currently
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LIT POETRY CLASHES AND COLLISIONS The Exam Structure You will answer two questions on poetry. The exam will last one hour and forty-five minutes and is worth 25% of your total GCSE. The exam is divided into two sections: Section A: Unseen Poetry • You will be presented with a poem you have not studied. • You read through the poem and answer the questions set. This section is worth 20 MARKS Section B: Anthology Poems • You will answer 1 question in 2 parts. • Each part is worth 15 MARKS • This section
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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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** to *.** (15 minutes) Writing time: *.** to *.** (1 hour 30 minutes) DATA BOOK Directions to students • A 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
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