Chapter 16/17

STUDY
PLAY
thermochemistry
is the study of the transfers of energy as heat that accompany chemical reactions and physical changes
calorimeter
the energy absorbed or released in a chemical or physical change is measured
temperature
is a measure of the average kinetic energy of the particles in a sample of matter
joule
is the si unit of heat as all other forms of energy
heat
can be thought of as the energy transferred between samples of matter because of a difference in their temperatures
specific heat
is the amount of energy required to raise the temperature of one gram of substance by one celsius degree or one kelvin
thermochemical
an equation that includes the quantity of energy released or absorbed as heat during the reaction as written
enthalpy change
is the amount of energy absorbed or lost by a system as heat during a process at constant pressure
molar heat of formation
is the energy released or absorbed as heat when one mole of a compound of its elements
heat of combustion
the energy released as heat by the complete combustion of one mole of a substance is called the...
hess law
the overall enthalpy change in a reaction is equal to the sum of enthalpy changes for the individual steps in the process
entropy
a measure of the degree of randomness of the particles, such as molecules, in a system
reaction mechanism
the step by step sequence of reactions by which the overall chemical change occurs
intermediates
species that appear in some steps but not in the net equation are known as
collision theory
the set of assumptions regarding collisions and reactions is known as
activation energy
is the minimum energy required to transform the reactors into an activated complex
activated complex
a transitional structure that results from an effective collision and that persists while old bonds are breaking and new bonds are forming is called an
reaction rate
the change in concentration of reactants per unit time as a reaction proceeds is called the
chemical kinetics
the area of chemistry that is concerned with reaction rates and reaction mechanisms is called
catalyst
is a substance that changes the rate of a chemical reaction without itself being permanently consumed