physical process heat exchange (q) calculation
DESCRIPTION
PHYSICAL PROCESS q EQUATIONS DECISION MAP. PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION. Q = m Hf . 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 - PowerPoint PPT PresentationTRANSCRIPT
PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION
PHYSICAL PROCESS q EQUATIONS DECISION MAP
IS THERE A PHASE CHANGE ?
NO
RECOGNIZE HINTS1)A ∆T.
1) 2 TEMPERATURES GIVEN
2) ONE TEMP GIVEN AND ONE ASKED FOR.
2)HEATING3)COOLING4)HEAT EVOLVED5)HEAT ABSORBED6)HOW MANY J OR kJ need to cause a certain ∆T.
Use
Q = mC∆T.∆T = T2 – T1
IS THE SAMPLE AT THE FREEZING POINT
NO
YES
RECOGNIZE HINTS1)NO ∆T.2)FREEZING3)MELTING4)SOLID TO LIQUID, LIQUID TO SOLID5)AT 0.0 C (WATER)6)CONSTANT TEMP7)AT FREEZING
YES
Q = mHf.Hf = HEAT OF FUSION TABLE B
RECOGNIZE HINTS1)NO ∆T.2)CONDENSATION3)EVAPORATION4)LIQUID TO GAS, GAS TO LIQUID5)AT 100 C (WATER)6)CONSTANT TEMP7)AT BOILING POINT
Q = mHV
HV = HEAT OF VAPORIZATION TABLE B