CHAPTER 1_FALL_2006

CHAPTER 1_FALL_2006 - INTRODUCTION AND CHAPTER 1: MATTER...

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INTRODUCTION AND CHAPTER 1:  MATTER – ITS PROPERTIES AND  MEASUREMENT Here’s the entire subject of the course … HOW DO WE DEFINE AND DESCRIBE THE  MATERIAL WORLD? THE POINT:    Chemists do this differently than other  people. States – solid, liquid, gas, gel, plasma … If it has mass and occupies space, we’ll deal with it. QUESTION:  This is a sand dune in the Sahara Desert.  What do you notice about it?     Why do you think that happens? 
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How do chemists describe matter? Elements     compounds     mixtures Pure substances vs. mixtures WHY DOES IT MATTER?  COMPOSITION   DETERMINES PROPERTIES Qualitative vs. quantitative
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PHYSICAL PROPERTIES ==== PHYSICAL CHANGES The point:       QUALITATIVE    vs.  QUANTITATIVE  properties Sugar white crystalline solid m pt. 185-186 o C water soluble 2 g in 1 mL water at  20 o C Salt white crystalline solid 801 o C water soluble 0.36 g in 1 mL  water at 20 o C Color Physical state Melting pt // freezing pt      boiling pt // liquefaction temp Are liquid water and steam and ice the same material?   How can you tell the difference between water and  ethanol?
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Water colorless liquid m pt       0 o C           b pt  100 o
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This note was uploaded on 02/26/2008 for the course CHEM 025 taught by Professor X during the Fall '06 term at Lehigh University .

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CHAPTER 1_FALL_2006 - INTRODUCTION AND CHAPTER 1: MATTER...

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