UNIT 7: Chemical Kinetics

Created by

Han Castañeda

Cards (27)

Thermodynamics is the study between the relationship of heat, work, temp, and energy.
System 
quantity of matter chosen for study
Surroundings 
region outside the system
Open System 
exchange of heat and matter
Closed System 
exchange of heat
IsolatedSystem 
no exchange
Exothermic Rxn 
releases energy from the system
Endothermic Rxn 
absorbs energy from its surrounddings
Enthalpy 
amount of heat-energy a substance contains
Enthalpy Change 
heat transferred by a process that occurs at constant pressure.
Enthalpy is a state function
Thermochemical Equation
heat released/absorbed could be indicated in the chemical eq.
Hess' Law 
change in enthalpy is constant.
Properties of Thermochem Eq.:
Reversable
Treated as algebraic expressions
Standard Enthalpy of Formation 
heat change results when one mole of a compound is formed from its elements at STP.
Chemical Kinetics 
area of chemistry concerned with the speeds, or rates, at which a chemical reaction occurs
Reaction rate 
the change in the concentration of a reactant or a product with time (M/s).
Rate constant 
The rate of a reaction is proportional to the concentration of reactants and that the proportionality constant k
Rate Law 
expresses the relationship of the rate of a reaction to the rate constant and the concentrations of the reactants raised to some powers.
Reaction Order 
defined as the sum of the powers to which all reactant concentrations appearing in the rate law are raised.
Phase Diagram 
convenient way to represent graphically the conditions at which a particle state is stable.
y-axis of a Phase Diagram
Pressure
x-axis of a Phase Diagram
Temperature
Entropy 
measure of the disorder of a system
Critical point 
where the liquid and gaseous phases of a substance merge into one.
Triple point 
where both states of a substance co-exist
Supercritical fluid 
possesses both liquid and gas properties