PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION
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PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION PHYSICAL PROCESS q EQUATIONS DECISION MAP IS THERE A PHASE CHANGE ? NO RECOGNIZE HINTS 1)A ∆T. 1) 2 TEMPERATURES GIVEN 2) ONE TEMP GIVEN AND ONE ASKED FOR. 2)HEATING 3)COOLING 4)HEAT EVOLVED 5)HEAT ABSORBED 6)HOW MANY J OR kJ need to cause a certain ∆T. Use Q = mC∆T. ∆T = T 2 – T 1 IS THE SAMPLE AT THE FREEZING POINT NO YE S RECOGNIZE HINTS 1)NO ∆T. 2)FREEZING 3)MELTING 4)SOLID TO LIQUID, LIQUID TO SOLID 5)AT 0.0 C (WATER) 6)CONSTANT TEMP 7)AT FREEZING YES Q = mHf. Hf = HEAT OF FUSION TABLE B
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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 Presentation
Transcript of PHYSICAL PROCESS HEAT EXCHANGE (q) CALCULATION
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
