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CHM103 Class Notes Week 2 (8/29-9/2)

by: askcch

CHM103 Class Notes Week 2 (8/29-9/2) 103

Marketplace > University of Miami > Chemistry > 103 > CHM103 Class Notes Week 2 8 29 9 2
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About this Document

These notes cover Chapter 1, section 1.6 - 1.10
Chemistry for Life Sciences I (Lecture)
Elliot Atlas
Class Notes
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This 2 page Class Notes was uploaded by askcch on Friday September 9, 2016. The Class Notes belongs to 103 at University of Miami taught by Elliot Atlas in Fall 2016. Since its upload, it has received 6 views. For similar materials see Chemistry for Life Sciences I (Lecture) in Chemistry at University of Miami.


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Date Created: 09/09/16
  CHM103     lass   Notes   Week   2   8/29­9/2)   ________________________________________________________________________________  From     revious    ections   ­ 1.1­1.5  ­ Definition  and examples  of matter, physical  and  chemical  properties/change  ­ Chemical    lements  and symbols,   chemical   eactions  ________________________________________________________________________________  Chapter   1:   atter  and   Measurements   ­ 1.6  Physical  Quantities:   Units  and  Scientific  Notation  ­ The    ysteme   International   d’ Unites   SI)  ­ Mass        ilograms  (kg)  ­ Length  →     eters (m)  ­ Volume      cubic    eters  (m^3)  ­ Temperature   →  kelvins  (K)  ­ Time   →  seconds   (s)  ­ Electric  Current   →    mpere   (A)  ­ Substance   Amount   →  mole  (mol)  ­ Speed      m/s  ­ Density   →    /cm^3      ­ Scientific   Notation  ­ 7650       .65    10^3  ­ 0.00215   = 2.15  x  10^­3  ­ 1.7    easuring   Mass,   Length,   and   Volume  ­ Mass:  a  measure   of the  amount   of  matter   in an  object  ­ Weight:   a measure   of  the  gravitational   force  that  the  earth   or other   large   body  exerts   on    n object  ­ Length:   the  SI unit  meter   is way  too   big for  usual   lab  measurements  ­ Volume:   the  amount   of space   occupied   by  an  object  ­ 1.8    easurement   and  Significant    igures  ­ Every   set  of measurements   has  a  degree  of  uncertainty   to it,thus   significant  figures     re   pplied  ­ Accuracy:   how  close   to  observed   value   is to the  “true”   value  ­ Precision:   the  reproducibility   of values;   does   it produce  the  same   value   every  time?  ­ Two    ypes   of   rrors  for  measurements:   ­ Random   error:  randomly  too   high/low  ­ Systematic     rror: consistently   too  high/low   ­ 1.034  →   4 sig. fig.  0.0738   →   3 sig. fig.  7.360   →  4  sig. fig   7600   →  2  sig. fig.  ­ 1.9  Rounding   off Numbers  ­ Rule   1: During   multiplication  or  division,   the  answer  can’t   have   more  sig.  fig. than  the  original  numbers   (the  one   that has   the  least  sig.  fig.)  ­ Rule   2: During   +/­,the  answer   can’t  have   more   digits  after  the  decimal   point  than  the  original  numbers   (the  one   that has   the  least  sig.  fig.)  ­ 1.10   Problem  Solving:   Unit  Conversions   and   Estimating   Answers  ­ Factor­label   method  ­ Starting  Quantity  x  Conversion   Factor   =  Equivalent  Quantity  ­ Conversion   factors     re   umerically  equal  to      ­ e.g.  26.22mi   x (1km/0.6214mi)       2.20km  ­ e.g.  1yard/s   →   (x)mi/h?  ­ x    ≈ 2mi/h 


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