Calorimetry & Energy of light

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7 Terms

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Energy of light

  • v = frequency in Hz

  • λ = wavelength in nm (E-9)

  • h (constant) = 6.626E-34 Js

  • c (constant) = 3.0E8 m/s

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Rydberg’s formula (Only for H atom)

  • n = energy level

  • RH (constant) = 2.8E-18

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q = msΔT

Calorimetry

  • q = heat added in J

  • m = mass in g

  • s = specific heat in J/g°C

  • T = temperature in °C

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q = -CΔT

Bomb Calorimetry

  • q = heat added in J

  • C = heat capacity of calorimeter

  • ΔT = change in temperature in °C

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Endothermic reaction

  • Heat is absorbed by the reaction

  • Heat is transferred from the surroundings to the system

  • Heat can be written as a reactant for the reaction

  • ΔHrxn is positive

  • The reactants have lower energy than the products

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Exothermic reaction

  • Heat is given off by the reaction

  • Heat is transferred from the system to the surroundings

  • Heat can be written as a product for the reaction

  • ΔHrxn is negative

  • The reactants have higher energy than the products

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Hess’s Law

The total enthalpy change for a reaction is the sum of the enthalpy changes for the individual steps