THE LAW OF CONSERVATION OF ENERGYEnergy can not be created or destroyed
System and Environment System System is the substance, the reaction, a process that became the center of attention (object) Environment The environment is everything that is related to the system
Lets check it outExample:substance A and substance B isinserted into the test tubeSystem: substance A andsubstance BEnvironment: test tubes and air
Types of system1. Open System If the system and the environment can experience, exchange of matter and energy2. Closed System If the system and the environment can not be exchanged material, but it can be an exchange of energy3. Isolated System In system and the environment can not be an exchange of energy and matter
The sign for the heat and work• System received heat q (+)• System released heat q (-)• System does work w (-)• System received the work w (+)
Internal Energy (E)the amount of energy possessed by an agent or system ΔE = EP - ER
Reaction of Heat1. If reaction is reacting in closed system, with fixed volume (ΔV=0), where if ΔV=0 there is no work in there(w=0) So ΔE= q
2. If reaction is reacting in opened system, with fixed pressure , where may system do or received work So ΔE= q + w
Exothermic Reaction• Chemical reactions that are accompanied by the release of heat• Release heat from system to surrounding• H product < H reaction• Sign of ΔH is always (-)
Exothermic Reaction Reactants Products + Energy Energy of reactants Energy of productsEnergy Reactants - H Products Reaction Progress
Endothermic Reaction• Chemical reactions that are accompanied by the absorption of heat• Absorb heat from surrounding to system• H product > H reaction• Sign of ΔH is always (+)
Endothermic Reaction Energy + Reactants ProductsEnergy Activation Products Energy Reactants + H Endothermic Reaction progress
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Statement to find the key-word :1. Energy cannot be destroyed or created2. the part of the universe on which we focus our attention in a certain experiment3. the parts of the universe that interact instantly with the system or anything that restricts the system4. may heat exchange between system and surrounding and matter movement5. may heat exchange between system and surrounding and not matter movement6. impossible for heat exchange between system and surrounding7. subtracting the enthalpy of the reactant from the enthalpy of product8. energy contained in a substance at temperature of 25oC and pressure of 1 atm.9. a chemical reaction in which heat is absorbed from the surroundings10.a chemical reaction in which heat is released from the system11.Symbolize for enthalpy of the system falls.12.Symbolize for enthalpy of the system rises.
THERMOCHEMISTRY Law of Conservation of Energy Influenced by involvingOPENED ENTHALPY ENTHALPYCLOSED SYSTEM SURROUNDINGS CHANGEISOLATED causing ENDOTHERMIC EXOTHERMIC REACTION REACTION