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. Q = mHV HV = HEAT OF VAPORIZATION TABLE B 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