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Density, Mass, Volume Notes

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Page 1: Density,)Mass,)Volume)Notes) - Science with Ms. A - …sciencewithmsa.weebly.com/uploads/1/2/7/7/12776894/...Density)Notes)ConDnued) • Density)is)made)up)of)two)measurements) 1

Density,  Mass,  Volume  Notes  

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Review-­‐Just  Read  

•  Ma#er:    anything  that  has  mass  and  takes  up  space  (volume)  

•  Everything  in  the  universe  is  made  of  maCer  •  Made  of  Dny  parDcles  called  atoms  

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Physical  ProperDes  

All  forms  of  maCer  have  chemical  and    physical    properDes.    

Physical  Property  is  anything  that  can  be  observed  without  changing  the  idenDty  of  the  substance.    Examples  are  melDng  point,  boiling  point,  freezing  point,  color,  odor,  hardness  and  density.  

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Density  

•  Density:    A  measure  of  how  much  mass  is  contained  in  a  given  volume.    Density  is  a  physical  property.    

•  Density=  Mass  

         -­‐-­‐-­‐-­‐-­‐-­‐-­‐-­‐-­‐-­‐  

         Volume  

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Density  is  IMPORTANT  

•  Physical  property  that  can  be  used  to  idenDfy  a  substance.  

•  FloaDng,  objects  float  if  LESS  dense  than  the  liquid  it  is  placed  in  

Discussion:    Is  a  life  preserver  more  dense  than  your  body?    

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Density  Notes  ConDnued  

•  Density  is  made  up  of  two  measurements  1.  Mass  2.  Volume  

•  Units  are:    –  Solid  object:  grams  per  cubic  cenDmeter  (g/cm3)  OR  –  Liquid:  grams  per  milliliter  (g/mL).    

•  1  cm3  =  1  mL  

•  Water’s  density  is  1  g/mL  (or  1  g/cm3)  

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Think  about  it…  

•  Which  is  more  dense:    Salt  water  or  fresh  water?    

•  Talk  with  your  elbow  buddy  and  come  up  with  an  explanaDon  

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CalculaDng  Density  Show  your  work  

•  (1)What  is  the  density  of  a  wood  block  with  a  volume  of  100  cm3  and  a  mass  of  25  g?  

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Rule  1:  If  you  pack  more  mass  into  the  same  volume,  it’s  more  dense  

•  How  does  this  relate  to  you?  –  Think  about  packing  your  suitcase  for  vacaDon  full  of  clothes.  You  are  able  to  close  it  easily  but  you  go  shopping  while  on  vacaDon  and  you  have  to  stuff  everything  into  your  suitcase.  It  sDll  closes,  but  it  is  heavier.    •  Did  the  mass  change?  Talk  to  your  table    

–  YES  •  Did  the  volume  change?    

–  NO  •  Is  it  more  or  less  dense?  

– More  dense  

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Rule  #2:  If  you  pack  the  same  mass  into  a  smaller  volume,  it’s  more  dense  •  How  does  this  relate  to  you?  – Think  of  a  styrofoam  cup.  You  jump  on  the  cup  unDl  it’s  crushed  a  bit.    •  Did  the  volume  change?  

–  Yes,  it’s  squished  and  it’s  smaller  now  

•  Did  the  mass  change?  –  No,  it  would  sDll  weight  the  same  

•  Is  it  more  or  less  dense?  –  It  is  more  dense  

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Rule  #3:  Just  because  something  has  more  mass  does  not  mean  it’s  more  

dense  

•  Scenario:  I  have  a  bag  of  sytrofoam  packing  chips  and  I  have  a  paper  clip.    – Which  is  more  dense?  

•  The  paper  clip  – How  could  you  tell  if  some  substance  was  denser  than  another  substance?    •  Depends  on  how  much  mass  is  packed  into  a  volume  

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Measuring  Mass  

•  Mass  is  usually  measured  with  a  balance.    •  Quick  Facts  about  Mass  – Mass  is  the  measure  of  the  amount  of  “stuff  in  something”    

– Your  mass  will  not  change  even  if  you  went  to  outer  space  

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Measuring  Weight  

•  Weight  is  measured  using  a  weight  scale.    •  Weight  is  interrelated  with  mass.  The  weight  of  mass  (or  maCer)  is  the  fore  that  the  earth  pulls  on  the  mass  (or  maCer)  – Quick  Facts  about  Weight  

•  Your  weight  will  change  based  on  the  gravitaDonal  pull.  For  example,  your  weight  will  change  if  you  go  to  the  moon  because  gravity  is  different  then  on  Earth.    

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PracDce  

A  cube  has  a  mass  of  2.8g  and  occupies  a  volume  of  3.67mL.    Would  this  object  float  or  sink  in  water?  

•  This  object  would  _______________  in  water  because  its  density  is  _____________  than  water  whose  density  is  ______________.  

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More  PracDce  

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More  pracDce  


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