PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION

1
PHYSICAL PROCESS q EQUATIONS DECISION MAP
PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION
Q mHf. Hf HEAT OF FUSION TABLE B

• RECOGNIZE HINTS
• A ?T.
• 2 TEMPERATURES GIVEN
• ONE TEMP GIVEN AND ONE ASKED FOR.
• HEATING
• COOLING
• HEAT EVOLVED
• HEAT ABSORBED
• HOW MANY J OR kJ need to cause a certain ?T.

NO
IS THERE A PHASE CHANGE ?

• RECOGNIZE HINTS
• NO ?T.
• FREEZING
• MELTING
• SOLID TO LIQUID, LIQUID TO SOLID
• AT 0.0 C (WATER)
• CONSTANT TEMP
• AT FREEZING

YES
YES
Use Q mC?T. ?T T2 T1
IS THE SAMPLE AT THE FREEZING POINT
NO
2

• RECOGNIZE HINTS
• NO ?T.
• CONDENSATION
• EVAPORATION
• LIQUID TO GAS, GAS TO LIQUID
• AT 100 C (WATER)
• CONSTANT TEMP
• AT BOILING POINT

Q mHV HV HEAT OF VAPORIZATION TABLE B