Chemistry

CHEMISTRY FINALS REVIEWER (1st Semester 2011) CHAPTER 6: THERMODYNAMICS Thermodynamics study of heat and enthrall of heat from other forms of competency Thermochemistry study of heat that accompanies personal and chemical substance reactions System part of the universe that we are leaving to focus on Surroundings where heat/energy goes to/is from intragroup ENERGY (?E) = KE + PE A. ?E = Efinal Einitial = Eproducts Ereactants *if Efinal < Einitial = ?E (losing energy TO surroundings) *if Einitial < Efinal = +?E (losing energy FROM surroundings) B. ?E = q + w q = thermal energy = energy transferred amongst the system and surroundings as a result of a difference in their temperature only = mass (m) x special heat capacity (c) x transplant in temperature (?T) = m·c·?T w = work/energy transfer = work exerted when an object is moved by force = F·d

IF WORK IS DONE IN GASEOUS SYSTEMS: ?H = ?E + P?V ( tack in enthalpy (?H) is equal to the change in internal energy (?E) PLUS the product of unceasing pressure and change in volume (P?V) Work = - P?V ( ostracize kasi kunwari when air is being pushed into the container (?P), lumiliit yung volume sa loob nung container (?V), so negative yung volume) *going back to INTERNAL ENERGY, diba yung equation ?E = q + w, you female genital organ replace w with P?V so magiging ?E = q P?V.



pag trinanspose and stuff, magiging q = ?E + P?V or q = ?H Heat Capacity the gradation of heat required to change its temperature by 1 Kelvin q J ?T SI Unit: K a) Specific Heat Capacity (c) the quantity of heat require to change the temperature of 1gram of a substance by 1K q J m?T SI Unit: g·K b) Molar Heat Capacity (C) q J moles?T SI Unit: mol·K Calorimeter used to measure the heat released/absorbed by a physical/chemical process -qsystem = qsurroundings -*m·c·?T+ = m·c·?T THERMOCHEMICAL EQUATIONS: ?Hrxn = amounts (moles) of substances and their states of matter in that specific equation * ?H is (-) when it is EXOTHERMIC (release heat) *?H is (+) when it is...If you want to get a wide essay, order it on our website: Orderessay



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