Heat & Thermo Important Shtuff © 2015 D Taylor. Heat & Thermodynamics Or, “Let’s try to remember all that stuff we learned last year, K!”

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Presentation transcript:

Heat & Thermo Important Shtuff © 2015 D Taylor

Heat & Thermodynamics Or, “Let’s try to remember all that stuff we learned last year, K!”

Mini-LAB 100 Revs. MEASURE  T MEASURE  T. -Record on WhiteBd -Discuss

Basic LAWS 0 th Law 0 th Law – Two systems individually in thermal equilibrium with a 3 rd system are in equilibrium with each other. – Sorta like If A=B & B=C, then A=C

13-2: Thermal Expansion

13-4 Gas Laws Ideal Gas Laws – Boyle’s Law (1700) P 1 V 1 =P 2 V 2 – Charles’ Law V 1 /T 1 =V 2 /T 2 – Guy-Lusacs Law P 1 /T 1 =P 2 /T 2 Put them all together and…

Which means?

13-4: Kinetic Theory

Basic Stuff Kinetic Theory – Look on pg 452+ for pix & examples

U 13-4: Derivation of U

AP2 Ch14 Heat & Heat Transfer EZ PZ

14.2 Temperature Change and Heat Capacity Heat transfer : Fig 14-4

Calorimetry Since heat, Q, is a form of E… Q L = Q G  Q Total = 0 = mc  T So,

Calorimetry Q L = Q G Phase Change So,

14.4: Heat Transfer Methods

Ch15: Thermodynamics Or, “Let’s try to remember all that stuff we learned last year, K!”

Figure 15.3 WRONG!

Basic LAWS 1 st Law 1 st Law U f QW – Internal energy of a system changes from an initial value U i to a final value U f due to heat Q and work W:  U U f – U i Q + W  U = U f – U i = Q + W Q>0 0 when system gains heat & <0 when it loses heat. W>0 0 when work is done ON system & <0 when gas does work.

Q IN > 0 Q OUT < 0

W ON > 0 W BY < 0

Using the 1 st LAW 2500J of heat is added to a system, and 1800J of work is done on the system. Find change in internal energy of the system?

Using the 1 st LAW Work done on a system in one cycle?

– T of 3 mol is reduced from 540K to 350K by adding 5500J of heat to it. Find  U & W done by or on gas.

– T of 3 mol is reduced from 540K to 350K by adding 5500J of heat to it. Find  U & W done by or on gas. by or on gas?

Using the 1 st LAW Work done on or by a gas?

Basic LAWS 2 nd Law 2 nd Law – Heat flows from a substance at higher temp to a substance at lower temp and does NOT flow in the reverse direction. Ever.

Carnot (IDEAL) Engine

Basic LAWS 3rd Law 3rd Law – Absolute Zero is impossible to reach in a finite number of steps.