Heating Cooling Curve and PhaseDiagrams Heating C

Heating Cooling Curve and PhaseDiagrams Heating Cooling Curve and PhaseDiagrams A heating curve shows how the temperature of a substance changes as heat is added at a constant rate A heating cur

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Slide1Heating/Cooling Curve and PhaseDiagrams

Slide2Heating/Cooling Curve and PhaseDiagrams A  heating  curve shows  how  the temperature  of  a substance  changes as  heat  is  added  at  a constant  rate.       A  heating  curve shows  how  the temperature  of  a substance  changes as  heat  is  added  at  a constant  rate.

Slide3Heating/Cooling Curve and PhaseDiagrams The  heating  curve  at  right  shows  the temperature  change  in  a  sample  of iron  as  heat  is  added  at  a  constant rate.  The  sample  starts  out  as  a  solid and  ends  as  a  gas. The  heating  curve  at  right  shows  the temperature  change  in  a  sample  of iron  as  heat  is  added  at  a  constant rate.  The  sample  starts  out  as  a  solid and  ends  as  a  gas.     • Describe  the  phase  change  that occurred  between  points  B  and  C on  the  graph. • Describe  the  phase  change  that occurred  between  points  B  and  C on  the  graph.     Solution: Solution:         Between  points  B  and  C,  the sample  changed  from  solid  to liquid .         Between  points  B  and  C,  the sample  changed  from  solid  to liquid .

Slide4Heating/Cooling Curve and PhaseDiagrams 1.  In  the  heating  curve for  iron,  describe  the phase  change  that occurred  between points  D  and  E  on  the graph. 1.  In  the  heating  curve for  iron,  describe  the phase  change  that occurred  between points  D  and  E  on  the graph.

Slide5Heating Cooling Curve and PhaseDiagrams 2.  Explain  why  the temperature  stayed constant  between points  D  and  E. 2.  Explain  why  the temperature  stayed constant  between points  D  and  E.

Slide6Heating Cooling Curve and PhaseDiagrams 3.  What  is  the  melting temperature  of  iron? 3.  What  is  the  melting temperature  of  iron?

Slide7Heating Cooling Curve and PhaseDiagrams 4.  What  is  the  freezing temperature  of  iron? How  do  you  know? 4.  What  is  the  freezing temperature  of  iron? How  do  you  know?

Slide8Heating Cooling Curve and PhaseDiagrams 5.  What  is  the  boiling temperature  of  iron? 5.  What  is  the  boiling temperature  of  iron?

Slide9Heating Cooling Curve and PhaseDiagrams 6.  Compare  the  boiling temperatures  of  iron and  water  (water  boils at  100°C).  Which substance  has  stronger intermolecular  forces? How  do  you  know? 6.  Compare  the  boiling temperatures  of  iron and  water  (water  boils at  100°C).  Which substance  has  stronger intermolecular  forces? How  do  you  know?

Slide10Heating Cooling Curve and PhaseDiagrams 7.  Between  which  two points  on  the  graph did  freezing  occur? 7.  Between  which  two points  on  the  graph did  freezing  occur?

Slide11Heating Cooling Curve and PhaseDiagrams 8.  What  is  the  freezing temperature  of  stearic acid?  What  is  its melting  temperature? 8.  What  is  the  freezing temperature  of  stearic acid?  What  is  its melting  temperature?

Slide12Heating Cooling Curve and PhaseDiagrams 9.  Compare  the  melting temperature  of  stearic acid  with  the  melting temperature  of  water. Which  substance  has stronger intermolecular  forces? How  do  you  know? 9.  Compare  the  melting temperature  of  stearic acid  with  the  melting temperature  of  water. Which  substance  has stronger intermolecular  forces? How  do  you  know?

Slide13Heating Cooling Curve and PhaseDiagrams 10.  Can  a  substance  be cooled  to  a temperature  below  its freezing  point?  Use evidence  from  any  of the  graphs  in  this  skill sheet  to  defend  your answer. 10.  Can  a  substance  be cooled  to  a temperature  below  its freezing  point?  Use evidence  from  any  of the  graphs  in  this  skill sheet  to  defend  your answer.

Slide14Heating Cooling Curve and PhaseDiagrams States  of  matter  are States  of  matter  are • Solid • Solid • Liquid • Liquid • gas • gas Phase  diagrams Phase  diagrams • pressure-temperature diagrams • pressure-temperature diagrams

Slide15Heating Cooling Curve and PhaseDiagrams Triple points mark conditions at which three different phases can coexist. For example, the water phase diagram has a triple point corresponding to the single temperature and pressure at which solid, liquid, and gaseous water can coexist in a stable equilibrium

Slide16Heating Cooling Curve and PhaseDiagrams 1.  At  what  temperature and  pressure  does  H 2 O exist  as  a  solid,  liquid and  a  gas? 1.  At  what  temperature and  pressure  does  H 2 O exist  as  a  solid,  liquid and  a  gas?

Slide17Heating Cooling Curve and PhaseDiagrams 2.  At  100°C  and  a pressure  above  1.0 atmosphere,  H 2 O  exists in  which  phase  of matter? 2.  At  100°C  and  a pressure  above  1.0 atmosphere,  H 2 O  exists in  which  phase  of matter?

Slide18Heating Cooling Curve and PhaseDiagrams 3.  At  100°C  and  a pressure  below  1.0 atmosphere,  H 2 O  exists in  which  phase  of matter? 3.  At  100°C  and  a pressure  below  1.0 atmosphere,  H 2 O  exists in  which  phase  of matter?