Chemistry Flashcards
What is a zero order reaction
constant rate
doesn’t depend on concentration of reactant
What can affect a zero order rxn
changing temp or adding a catalyst
What would a concentration vs. time graph look like for a zero order rxn
straight line
slope=k
What is a first order rxn
non constant rate that DOES depend on concentration of reactant
What does a concentration vs. time curve look like for first order rxn
non linear
slope for ln[A] vs time=-k
What is a second order rxn
non-constant rate that depends on the concentration of reactant
What does the concentration vs. time graph look like for second order
non linear
What is an exergonic rxn
energy given off
usually has negative free energy
What is an endergonic rxn
energy absorbed
Usually has positive free energy
What does it mean if Q
reaction proceeds in forward direction
What does it mean if Q=Keq Delta G=0
Rxn is in equilibrium
What does is mean if Q>Keq, Delta G>0
Rxn proceeds in reverse direction
What does it mean if Keq>1
Products favored
more products at eq
What does it mean if Keq=1
Products and reactants are in eq
What does it mean if Ke<1
Reactants favored
arrow pointing to left, reactants on left
According to Le Chatelier’s Principle what does it mean to increase concentration of reactants or decrease concentration of products
Rxn shifts right
According to Le Chatelier’s Principle what does it mea to increase concentration of products or decrease concentration of reactants
shift rxn to left
According to Le Chatelier’s Principle what does it mean to increase pressure on a gaseous system (decrease volume)
shifts rxn towards side with fewer moles of gas
According to Le Chatelier’s Principle what does it mean to decrease gaseous system (increase volume)
Shifts rxn to side with more moles gas
Describe an isothermal process
Occurs at constant temp
Describe adiabatic process
Exchange no heat w/ environment
Describe isobaric processes
occur at constant pressure
Isovolumetric (isochoric) process
Occurs at constant volume
Define enthalpy
Measure of potential energy of a system
Define entropy
Measure of the degree energy has been spread throughout a system
If delta G<0 then
rxn is spontaneous (forward)
If delta G=0
rxn is in eq
If delta G>0
rxn is non spontaneous (reverse)
Define the critical point
Liquid and gas phases are indistinguishable
What is another word for melting
Fusion
