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Heating & Cooling Graphs

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Presentation on theme: "Heating & Cooling Graphs"— Presentation transcript:

1 Heating & Cooling Graphs
Result by plotting temperature data as heat is added to a substance

2 A typical heating graph will have up to 5 lines. What are they?
Tempera t u r e Heat being added  A B C D E

3 A- solid (being heated) B- S  L (as heat is added)
Tempera t u r e Heat being added  A B C D E A solid (being heated) B- S  L (as heat is added) C- liquid (being heated) D- L  G (as heat is added) E- gas (being heated) T1 - melting point T2 - boiling point

4 Which lines represent-
Tempera t u r e Heat being added  A B C D E Which lines represent- phase changes Single phases B is melting D is boiling A is ice being warmed up C is liquid being warmed up E is gas being warmed up True or False: As a substance is heated the temperature will always increase.

5 T1 T2 Tempera t u r e Heat being added  A B C D E True or False: As a substance is heated the temperature will always increase. F When there are 2 phases in equilibrium (melting, boiling or subliming) The temperature remains constant until all molecules are in one phase or state.

6 Molecular Perspective

7 Consider water. What are the values of T1 and T2?
Tempera t u r e Heat being added  A B C D E 273 K and 373 K or 0o C and 100oC

8 Consider water. How would you label line C? Line E?
Tempera t u r e Heat being added  A B C D E C. Liquid water being heated from 0oC to 100oC E. Water vapor being heated from 100oC to higher temp.

9 Phase Diagrams Plot Pressure vs Temperature and show the phase (solid, liquid or gas) of the substance.

10 Phase Diagrams P T

11 Lines - two phases present Areas – single phase present

12 Lines - two phases present Areas – single phase present

13 Lines - two phases present Areas – single phase present
(S  L) L S ( L  G ) G ? Lines - two phases present Areas – single phase present

14 Triple Point – all three phases (S, L & G) in equilibrium.
Critical Point (S  L) x L S ( L  G ) x G ? Triple Point – all three phases (S, L & G) in equilibrium. Critical Point- Substance cannot be liquified if it is above the critical temperature.

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