Energy Chem 30 Ap

  1. what is enthalpy and enthalpy change
    • enthalpy is the total internal energy of a system 
    • enthalpy change is the energy released or absorbed by a system
  2. what is molar enthalpy
    molar enthalpy is the amount of energy released or absorbed by one mole of a substance
  3. can the individual enthalpy of a system be determined?
    no but you can determine the enthalpy change by determining the energy change from the enviorment
  4. what happen in an exothermic reaction
    energy is released when bonds are formed so the temperature of the surroundings increases
  5. what happens during a endothermic reaction
    energy is absorbed to break the bonds so temperature in the surrounding decreases
  6. Image Upload 2
    Left is exothermic potential energy goes down right is endothermic potential energy goes up

    labels are ep and reaction pathway
  7. what is the collision theory and what are the 2 requirements
    collision theory states that reactant particles must collide for a reaction to occur but only a certain amount of the total collisions will result in a chemical reaction

    2 requirements- the right orientation at the moment of impact, the minimal amount of activation energy needed
  8. Image Upload 4 Image Upload 6
  9. what is a catalyst
    a catalyst is a substance that speeds up the rate of chemical reaction without being consumed in the reaction they do this by lowering the activation energy.
  10. what are 5 examples of catalysts
    • cdc-used to catalyze 03 into 02
    • nitric acid- used in fertelizer
    • sulfric acid- used in oil industry
    • enzymes-our body
    • catalytic convertors in cars- turn no and co into nitrogen gas and co2
  11. 3 types of systems
    • open system-matter and energy can be exchanged
    • closed- matter cannot be exchanged but energy can
    • isolated- neither can be exchanged
  12. what does a calorimeter do and what are the assumptions for It?
    a calorimeter is a isolated system that is used to measure heat released or absorbed by a physical or chemical process 

    • -Isolated system does not allow products to escape or thermal energy to be transferred to surroundings
    •  -calorimeter does not absorb heat itself
    • -contains a small amount of water to help with energy transfer.
  13. how do you know if a reaction was endo or eco with a calorimeter
    • exo- temp of water increases
    • endo- temp of water decreases
  14. what is a bomb calorimeter?
    a closed system with changing pressures as the combustion reaction proceeds so water product is liquid not gas
  15. what are first and second law of thermodynamics
    • law one-energy cannot be created or destroyed only transferred
    • law two- thermal energy is transferred from an object with a higher temperature to an object with lower temperature to create equilibrium
Author
Andreiruse5
ID
365696
Card Set
Energy Chem 30 Ap
Description
Updated