Week 16.1 - 1st Law of Thermodynamics
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Last updated 9:52 AM on 1/8/23
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41 Terms
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What is kinetic energy?
energy associated with movement
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Formula kinetic energy
Ek=1/2 mv2
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What is m in the formula and its SI
mass - Kg
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What is v in the formula and its SI
velocity s/m
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What is potential energy?
energy possessed due to position
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Formula of potential energy
Ep= mgh
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What is g in the formula and its SI
gravity - 9.81 ms-2
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What is h in the formula and its SI
height - m
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Formula of total energy E
E= Ek + Ep
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Law of conservation of energy
Energy can neither be created or destroyed
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Types of system
open, closed and isolated
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What happens when the system is open?
exchange ENERGY and MATTER with surroundings
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What happens when the system is open?
exchange ENERGY with surroundings
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What happens when the system is open?
exchange NEITHER ENERGY NOR MATTER with surroundings
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Exothermic
release heat into the surroundings
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What type of reaction are combustions?
exothermic
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Endothermic
absorb heat from the surroundings
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What is the symbol of heat?
q
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What is the symbol of work?
w
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What is the symbol of volume?
V
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What is the symbol of change in
triangle
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What is the symbol of area?
A
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What is the formula of work?
\-pexΔV
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What is the symbol of external pressure?
pex
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What is the formula of work?
\-nRT ln(Vf/Vi)
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What is Vi?
initial volume
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What is Vf?
final volume
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What is T?
Temperature
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What is R?
Universal gas constant
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What is the symbol of heat capacity?
C
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What is Cs and its SI unit?
specific heat capacity J K-1 g-1
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What is Cm and its SI unit?
Molar heat capacity J K-1 mol-1
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What is Cp?
Heat capacity at constant pressure
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What is Cv?
Heat capacity at constant volume
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Heat capacity formula
C= q/ΔT
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transferred heat (q)
q= CΔT
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Moral internal energy symbol
Um
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Changes internal energy symbol
ΔU
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Changes internal energy formula
ΔU= w+q
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1st law of thermodynamic
Isolated systems can neither do work or heat surroundings. Their internal energies can not change, it’s constant
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At constant pressure, q=
ΔH
Note 
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