1: aqueous, thermochem, H reaction Flashcards
S.N.A.P
Sodium, Nitrate, Ammonium, Potassium salts
Beer-lambert law: A = ebC
A = absorbance
e = molar absorptivity
b = length of light path
C = concentration
What happens when concentration (x) increases?
Absorbance (y) also increases
The law of conservation of energy
Energy is neither created nor destroyed, only converted
What is enthalpy
Total kinetic + potential energy of a system
What is specific heat capacity
Quantity of heat required to raise the temp of something by 1 degree
What is calorimetry
Amount of heat energy released/absorbed during a physical/chemical process
Heat lost (-q) = what?
Heat lost (-q) = heat gained (+q)
solid to liquid to gas
which way is endo, exo?
to the right is endo, to the left is exo
solid to gas
sublimation
gas to solid
deposition
AB + CD =
AD + CB
First law of thermodynamics
energy system = -energy surroundings
What sides do endo/exo heat go in a reaction?
Endo on left (absorbs)
Exo on right (releases)
Diatmoics
H O Br F I N Cl
Relationship between temp and kinetic energy
Temp is proportional to kinetic energy (both increase/decrease)
zero Kalvin?
-273.15 C
K = C + 273.15
formula for heating/cooling curves?
use q = mcΔT when ΔT≠ 0
use q = nΔH when ΔT=0
what is Standard Molar Enthalpy of Formation, ∆Hformation?
energy released/absorbed when 1 mol of its elements are found directly from its elements at SATP
what is combustion
oxygen as reactant, CO2 and H2O as products
usually creates fire/smoke
3 ways to calculate ΔH reaction?
- using bond energy values:
mols reactants - mols products - using ΔH formation values:
mols products - mols reactants - Hess’s law:
ΔH1 + ΔH2 + ΔH3
Which of the ΔH reaction methods is the least accurate?
Using bond energy values - it averages values, not specific
What is ∆H solution
