Lab Name: Molar Mass by Freezing Point Depression Researcher: Isabella Cuenco Lab Start Date: November 9‚ 2012 Lab Completion Date: November 9‚ 2012 Table of Contents SECTION NAME I. Introduction II. Procedure III. Data IV. Analysis V. Conclusion PAGE NUMBER I. INTRODUCTION Purpose: The purpose of the lab is to find the molar mass of an unknown substance by measuring the freezing point depression of a solution of the unknown
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Nick Boyea Billy Lee 3/9/11 Molar Mass by Freezing Point Depression Overview The purpose of this lab is to measure the freezing point depression of a solution of an unknown substance and BHT to determine the molar mass of the unknown substance. Summary of Lab Procedure If not already completed‚ crush a small amount of BHT and pack it into a capillary tube. Use a small rubber band to clamp the capillary tube to the thermometer‚ and fasten the thermometer to a ring stand. Fill a Thiele tube
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Introduction Mosquito coils are widely used as mosquito repellent. The major active ingredients of most mosquito coils are pyrethrins‚ accounting for about 0.3 – 0.4% of the coil mass. When a Mosquito coil is burnt‚ the insecticides evaporate (pyrethrin‚ PAH‚ aldehyde etc.) with smoke‚ which prevent the mosquito from entering the room and harm those already in the room. The remaining components of mosquito coils include organic fillers‚ binders‚ dyes and other additives capable of burning well without
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Lab #3: Ion Exchange Chromatography Objective The purpose of this experiment was to separate proteins on the basis of their net charge at a particular pH. In cation exchange chromatography positively charged molecules are attracted to a negatively charged column. Conversely‚ in anion exchange chromatography‚ negatively charged molecules are attracted to a positively charged column. Experimental results could be monitored in a predictable way by controlling running pH‚ salt concentration‚ and by
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Common Core of Skills and Knowledge for the Children’s Workforce Children’s Workforce Development Council Association of Chief Police Officers Contents Introduction 4 1 Effective communication and engagement with children‚ young people‚ their families and carers 6 2 Child and young person development 10 3 Safeguarding and promoting the welfare of the child 13 4 Supporting transitions 16 5 Multi-agency working 18 6 Sharing information 21 7
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How is molar mass calculated and why is it useful? You have to multiply the atomic weight of each element by the number of atoms that it contains in a compound. Molar mass is useful because its used to change a measurement of mass to an amount of a substance such as the number of particles. 2.Define a mole in chemistry and give 3 examples equivalent units that are used in chemical calculations. A mole measures the amount of a substance. Three examples that are equivalent to a mole is molar mass‚
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Investigation - Solution Colour and Ion Concentration Aim: To investigate whether solution colour can be used to reliably determine the concentration of coloured ions in a solution. Hypothesis: the concentration of permanganate ions in the solution is inversely proportional to the percentage transmission of light through the solution. Dependent variable: concentration of permanganate ions. Independent variable: percentage transmission of light through the solution. Equipment: 20 ml
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very different than the Ksp using activities. The average Ksp using molarity only was 2.26 x 10-4 and the average Ksp using activity turned out to be 2.31 x 10-5. The actual Ksp however‚ is 3.14 x 10-5. A percent error of 26.6 % was calculated. Introduction Experimental In this experiment‚ a saturated calcium sulfate was already made and ready to use. 25.00 mL of this solution was then mixed with 10 mL of an ammonia buffer and 1 drop of eriochrome black 1 indicator. We then filled our burette
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physical properties such as solubility and boiling points. It includes an introduction to more complicated naturally-occurring esters like animal and vegetable fats and oils. What are esters? Esters are derived from carboxylic acids. A carboxylic acid contains the -COOH group‚ and in an ester the hydrogen in this group is replaced by a hydrocarbon group of some kind. This could be an alkyl group like methyl or ethyl‚ or one containing a benzene ring like phenyl. A common ester - ethyl ethanoate
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Student’s Name __________Lisa __________ Date of Experiment _08/03/2013__________ Date Report Submitted ______08/05/2013___________ Title: Identification of Metallic Ions Purpose: To perform and observe the flame tests of some alkali and alkaline earth metal ions. Understanding Light Introduction: Electrons from an atom can absorb energy and become excited to move from the stable “ground state” energy level to a higher energy level. Imagine one of the electrons “jumping”
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