Catatan Popular

  • Enthalpy of Formation, ∆Hf
    • The change of heat when 1 mole of a   compound is formed from its elements at their   standard states.              H 2 (g) + ½ O 2(g) ...
  • Enthalpy of Solution, Hsoln
    The enthalpy of solution , enthalpy of dissolution , or heat of solution is the enthalpy change associated with the dissolution of a subst...
  • Enthalpy of Sublimation, Hsubl
    The heat (or enthalpy) of sublimation is the amount of energy that must be added to a solid at constant pressure in order to turn it direct...
  • Enthalpy of Combustion, ∆Hc
    • The heat released   when 1 mole of substance is burned completely in excess oxygen.     C (s) +   O 2(g)    → CO 2(g)                  ∆ ...
  • Enthalpy of Neutralization, ∆Hn
    The enthalpy of neutralization ( Δ H n o ) is the change in enthalpy that occurs when an acid and base undergo a neutralization reaction...
  • Enthalpy of Hydration, Hhyd
    • The heat change when 1 mole of gaseous ions is hydrated in water . • e.g:   Na + (g) ¾ ® Na + (aq)     D H hyd = - 406 kJ mol -1   C...
  • Born-Haber Cycle
    Ionic solids tend to be very stable compounds. The enthalpies of formation of the ionic molecules cannot alone account for this stability. ...
  • Calorimetry
    Calorimetry is the process of measuring the amount of heat released or absorbed during a chemical reaction. Calorimetry is a way of deter...
  • Enthalpy of Atomisation, Ha
    • The heat change when 1 mole of gaseous atoms is formed from its element      • D H a is always positive because it involves only breakin...
  • thermochemistry
    Thermochemistry is the study of the energy and heat associated with chemical reactions and/or physical transformations. A reaction may r...

Thursday, March 3, 2011

Important Terms


nHeat is energy transferred between two bodies of  different temperatures
nSystem is any specific part of the universe
nSurroundings is everything that lies outside the system
nOpen system is a system that can exchange mass and energy with its surroundings
nClosed system is a system that allows the exchange of energy  with its surroundings
nIsolated system is a system that does not allow the exchange of either mass or energy with its surroundings
nEnergy is the ability to do work
nSI unit of energy is kg m2 s-2 or Joule (J)
 
nNon SI unit of energy is calorie (Cal)
n1 Cal = 4.184 J
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