Heating Curves and Calculations

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Presentation transcript:

Heating Curves and Calculations Quiz tomorrow

Observe the heating curve below: What phase is substance B at 60oC? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C Solid (it’s below the melting point)

Observe the heating curve below: What is the melting point of substance A? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C 45oC

Observe the heating curve below: What is the boiling point of substance C? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C 160oC

Substance B (longest vaporization region) Observe the heating curve below: Which substance has the greatest DHVAP? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C Substance B (longest vaporization region)

Observe the heating curve below: Which substance has the lowest DHFUS? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C Substance C (shortest melting region)

A (gentle slope, heats up slowly) Observe the heating curve below: Which substance has the highest specific heat as a solid? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C A (gentle slope, heats up slowly)

C (drastic slope, heats up quickly) Observe the heating curve below: Which substance has the lowest specific heat as a vapor? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C C (drastic slope, heats up quickly)

None (it stays liquid the whole time) Observe the heating curve below: If substance A is heated from 52oC to 235oC, how many phase changes will it undergo? Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C None (it stays liquid the whole time)

Any temperature between 160 and 220 Observe the heating curve below: Guess a temperature where B is liquid but C is vapor Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C Any temperature between 160 and 220

Observe the heating curve below: Which will release more heat Observe the heating curve below: Which will release more heat? Condensing of 1 mole of A Freezing 1 mole of B Temp (oC) 250 220 160 90 65 45 Substance A Substance B Substance C Freezing 1 mole of B

Use these charts to answer the questions on the following slides.

How much heat is released when 2.00 moles of water freeze? -12.0 kJ of heat

How much heat is absorbed when 5.00 moles of ammonia vaporize? 117 kJ of heat

How much heat is absorbed when 15.0 grams of ethanol (C2H5OH) melts? 1.61 kJ of heat

How much heat is absorbed by 72 How much heat is absorbed by 72.08 grams of water that rises in temperature from 50.0oC up to 110.0oC Something around 179 kJ or 179,000 J Heating up liquid: 15079 J Vaporization: 162.8 kJ Heating up vapor: 1449 J