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Chemistry030513

Thermochemistry notes

TermDefinition
Thermochemistry The branch of chemistry pertaining to TEMPERATURE CHANGES and HEAT TRANSFER of both physical processes and chemical reactions.
Heat (Delta H) A measure of both the speed & quantity of particles (total energy) measured in Joules (J) heat is transferred from a warmer object to a cooler object
Heating + Cooling curves The nature of water. Water has the chemical formula H2O and has a bent molecular structure, resulting in the molecule being POLAR.
Why are water molecules attracted to one another? Due to polarity (Hydrogen bonds)
Water heating curve (s) -100 - 0
Water heating curve (s-> 1) melting 0-0
Water heating curve (1) 0->100
Water heating curve (1->g) boiling 100-100
Water heating curve (g) 100->200+
Water cooling curve (g) 200-100
Water cooling curve (g->1) condensing 100->100
Water cooling curve (1) 100->0
Water cooling curve (1->s) freezing 0->0
Water cooling curve (s) 0-> -100
Melting & Freezing Delt.H - HfusM
Boiling and Condensing Delt.H = HvapM
Heating & Cooling Delt.H=mcDelt.T
Delta H Heat (J)
Hfus Heat of fusion (J/G)
Hvap Heat of vaporization (J/g)
M Mass (g)
C Specific heat capacity (J/g C)
Delta T Temperature change (Final tmp - initial temp)
Endothermic reaction Delt.H is written as a reactant ; positive
Exothermic reaction Delt. H is written as a product ; negative
Heat of reaction The amount of energy released or absorbed by a chemical reaction
Enthalpy at constant, pressure the heat of reaction
delta H The total energy of bonds broken - total energy of bonds formed
heat of formation heat released or absorbed when one mole of a compound is formed by a combo of its elements
heat of a reaction is also.. the total of heats of formation of products minus the heats of the formation of the reactants
steps need to be reversed sometimes... can be multiplied by a constant or a step can be reversed
if step multiplied by a # DELTA H is also multiplied by that number
if step is reversed the sign of delta h is also reversed
Created by: kayamay