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CHEM-C127 Exam 1 Information to Know

by: Kathryn Brinser

CHEM-C127 Exam 1 Information to Know Chemistry C127

Marketplace > Indiana University > Chemistry > Chemistry C127 > CHEM C127 Exam 1 Information to Know
Kathryn Brinser
GPA 4.0

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About this Document

Gives an overview of information we need to know for the first exam based on the lecture from 2/25/16. The information is experiment-specific.
Principles of Chemistry and Biochem I Lab
Dr. Norman Dean
Study Guide
chem-c127, chem c127, Chemistry, Chem, c127, Study Guide
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This 1 page Study Guide was uploaded by Kathryn Brinser on Sunday February 28, 2016. The Study Guide belongs to Chemistry C127 at Indiana University taught by Dr. Norman Dean in Fall 2016. Since its upload, it has received 159 views. For similar materials see Principles of Chemistry and Biochem I Lab in Chemistry at Indiana University.


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Date Created: 02/28/16
C127 Exam Information/Study Guide 2-28-16  Questions relatively evenly split between 4 experiments o Any kind of calculator allowed o Lab notebook allowed o 3x5 note card allowed o Sunday 2/28 7:15 Q/A review  Calorimetry o Be able to calculate specific heat capacities (J/g C) and/or calorimeter constants (J/ C) given the needed information o o Heat lost by a 100.0 C metal = heat gained by water AND the calorimeter  ???????????????????????? = −???? ???????????????????? − ???????????????????????????????????????????????? ????  ???? ???????????????????? ????Δ????1= −???? ????????????????????(4.184 ????℃) Δ???? 2 ???? ????????????Δ????2 o Know how systematic error affects calculated values, like specific heat capacities  Soap o Properties of micelles  Polar hydrophilic head, nonpolar hydrophobic tail  The shorter the carbon chain of the soap (the smaller a micelle), the poorer of a cleaning agent the soap will be; the larger the carbon chain of the soap (the larger a micelle), the better of a cleaning agent the soap will be  Shorter chains = smaller micelle = less room inside the micelle = not much room to trap nonpolar dirt/oil  Vice versa for longer chains  Allow nonpolar reactants to react in water o The reaction process of making soap  Reactions speed up with increased temperature, slow down with decreased temperature o Soaps vs. detergents  Soaps react with hard water, detergents do not  Both form micelles  Separation Anxiety o Know whether certain pairs of compounds can be separated based on chemical properties (ie. solubility) o Know definitions of extraction, distillation, fractional crystallization o Be able to determine how much of a substance will precipitate or remain dissolved in solution at different temperatures  Density and Data Analysis o No information given in lecture on this specific lab o Justified to throw out data if it is more than 2 standard deviations from the mean o Mean = ????1+???? 2???? 3⋯+???? ???? ???? (????1−???????????????? + ???? 2???????????????? +⋯+ ???? −???????????????? ) o Standard deviation = √ ????−1 ????????????????????????????????????????????????−????ℎ???????????????????????????????????? o % error = | ????ℎ???????????????????????????????????? |∙ 100 o In t-test, if ????-stat > ????-critical, the data sets can be considered different o Cannot identify systematic error unless the theoretical/true value is known o Accurate mass achieved with analytical balance o Accurate volume achieved with glassware based on what is best-suited  Volumetric pipets/flasks better than graduated cylinder; graduated cylinder better than beakers and Erlenmeyer flasks


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