Nov_02

# Nov_02 - Chapter 12 Heat Work and Energy Coffee Types of...

This preview shows pages 1–8. Sign up to view the full content.

Chapter 12 Heat, Work, and Energy

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Coffee
Types of systems

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Heat and Temperature heat : an amount of energy transferred due to a temperature difference temperature : a reflection of the average kinetic energy in a system not the total energy q = C T C = heat capacity of system C depends on the the type and amount of substance(s) in the system
Heat Capacity - example How much heat is transferred when 50 g of water is cooled from 55 ºC to 53 º C ? [molar heat capacity of water = 75.4 J mol -1 K -1 ] no .of mole of water = 50 / 18 = 2.78 mol q = n C T Δ q = 2.78 (75.4) (53 - 55) = - 420 J Note: negative sign means heat was lost

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
Work Pressure-volume work (w) is calculated using: w = - P ex V P ex - external P against which system is working V - change in volume If V increases work is -ve, i.e, system loses energy by doing work. Note P V is equivalent to F d
Internal Energy Internal energy (E or sometimes U) is the total energy in a system , both kinetic (motion) and potential (bonds) It is changed by the exchange of heat (q) or work (w) with the surroundings .

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 12

Nov_02 - Chapter 12 Heat Work and Energy Coffee Types of...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online