Energetics And Kinetics Flashcards
Summary
Define mean bond enthalpy
Average energy needed to break a certain type of bond over a range of compounds
Equation for enthalpy change
DeltaH= bonds broken — bonds formed
Calorimeter errors
Heat loss to surroundings
Heat absorbed by container
Flammable Liquid calorimetry errors
Incomplete combustion
Flammable liquid volatile so evaporates
Define
Standard enthalpy of formation
When one mole of a compound is formed
from its elements
in their standard states under standard conditions
Define
Standard enthalpy of combustion
When one mole of a compound
Is completely burned in oxygen
With all reactants and products in their standard states under standard conditions
Define
Standard enthalpy of reaction
Reaction occurs in the molar quantities shown in chemical equation
Under standard conditions with all reactants and products in standard states
What is Hess’s Law
Total enthalpy change of a reaction is independant of the route taken
What is the standard enthalpy change of formation value of an element?
Zero, 0
Maxwell Boltzmann Distribution Curve
X-axis label?
Y-axis label?
X-axis = kinetic energy Y-axis = no. of particles
Define a catalyst
▪▪▪▪
Substance that increases rate of reaction
By providing an alternative reaction route
With a lower activation energy.
It is chemically unchanged at the end of the reaction, it’s reformed
Define rate of reaction
Change in the amount of reactant or product over a period of time
