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Chem1ACh6

  1. Energy (symbol and definition)
    • E - anything that has the capacity to do work
    • (Quantity that an object can posess)
  2. Work (symbol and definition)
    • W - a force acting over a distance
    • W = force x distance
    • (way an onject can exchange E w/ other objects [in and out])
  3. Heat (symbol and definition)
    • q - flow of energy caused by a difference in temperature
    • (way an onject can exchange E w/ other objects [in and out])
  4. Types of energy w/ description
    • Kinetic - energy of motion OR energy being transfered
    • Thermal - energy with temperature (a form of Kinetic energy)
    • Potential - energy stored in an object OR energy associated with composition/position of object
  5. cal, Cal, Joule, Kilojoule, and Killowatt-hour (kWh)
    • 1 cal = 4.184 J
    • 1 Cal = 4184 J
    • 1 KJ = 1000 J
    • 1 kWh = 3.60 x 106
  6. Joule definition
    Amount of E needed to move a 1Kg mass 1 meter
  7. calorie definition
    Amount of E needed to raise 1g H2O 1 °C
  8. Change in Internal E formula
    • ΔE = q + W
    • W = -PΔV
    • q = Cs x Mass x ΔT
  9. Heat Capacity (symbol and definition)
    • C - amount of energy required to change an objects temperature by 1 degree C
    • Depends on amount of substance
  10. Specific Heat (symbol and definition)
    • Cs - amount of energy required to raise the temperature of 1g substance by 1 °C
    • Depends on type of substance (fixed amount)
  11. System/surroundings heat relationship
    • qsystem=-qsurroundings
    • qrxn=-qsol
  12. Bomb calorimeter details + formulas
    • Constant volume
    • Measures ΔE
    • qreaction=-qcalorimeter=-CcalorimeterxΔT
    • qreaction=-qcalorimeter-qH2O
  13. Coffee cup calorimeter details + formula
    • Constant pressure
    • Measures ΔH
    • qreaction=-qsolution=-Cs x Masss x ΔTs
  14. Enthalpy (symbol and definition) + equations
    • H - total energy of a system (internal E + work) / determines endo/exothermic
    • H = E + PV
    • ΔH = ΔE + PΔV
    • ΔH = q (@ constant P)
  15. Standard Conditions (thermodynamics) + symbol
    • symbol = °
    • gas = 1 atm pressure
    • liquid/solid = 1 atm pressure, 25°C
    • solution = 1M concentration
  16. Standard Enthalpy of formation (symbol + meaning)?
    • ΔHf° - enthalpy change for the reaction forming exactly one mole of a pure compound from its constituent elements at standard conditions
    • ΔHf° of elements is always - KJ/mol
  17. Standard enthalpy change (symbol + meaning + equation)
    • ΔH° - enthalpy change when all reactants an products are in their standard states
    • ΔH°reaction = ΣnΔHf°(products) - ΣnΔHf°(reactants)
    • where n is the cefficient in the reaction
Author
victimsofadown
ID
74787
Card Set
Chem1ACh6
Description
Chem1ACh6
Updated

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