Thermochemistry Flashcards
(43 cards)
What is the highest point of the enthalpy graph called?
activation complex
define open system
when both matter and energy can move in or out
whats the state of water in an open system
gas
define a closed system
matter stays in the system but energy can be exchanged
what is the state of water in a closed system
liquid
define an isolated system
when neither matter or energy can move in or out of the system
whats the state of water in an isolated system
liquid
what equipment do you use in an open system
beaker
what equipment do you use in a closed system
sealed flask
what type of equipment do you use in a isolated system
calorimeter
what type of system is a calorimeter
isolated
law of conservation of energy
energy is neither created nor destroyed in any physical or chemical change, it is only converted from one form to another
define heat
the thermal energy being transferred between the reaction and its surroundings
define kinetic energy
energy related to the motion of a chemical entity
define temperature
the average kinetic energy of all the particles in a substance
define thermal energy
the total kinetic energy of all the particles in a substance
define potential energy
the energy present in the chemical bonds
what does a change in potential energy change
bond structure
whats enthalpy
the total energy of a chemical system
what does capital H stand for in the formula and units
molar enthalpy in kJ/mol
whats the sign associated with an endothermic reaction
positive
whats the sign associated with an exothermic reaction
negative
do the products or reactants have more potential energy in an endothermic reaction
products have more potential energy
do the products or reactants have more potential energy in an exothermic reaction
reactants have more potential energy
