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

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