AS Chemistry - Enthalpy Changes

Beschreibung

Exothermic and Endothermic, Bond enthalpies, Calculating enthalpy changes
Sarah H-V
Mindmap von Sarah H-V, aktualisiert more than 1 year ago
Sarah H-V
Erstellt von Sarah H-V vor fast 10 Jahre
1604
72

Zusammenfassung der Ressource

AS Chemistry - Enthalpy Changes
  1. Exothermic and Endothermic
    1. Endothermic
      1. The absorption of energy to the surroundings
        1. Delta H is positive
          1. Themal Decomposition
            1. Photosynthesis
            2. Exothermic
              1. The release of energy to the surroundings
                1. Delta H is negative
                  1. Combustion
                    1. Respiration
                  2. Types of enthalpy change
                    1. Standard Enthalpy Change of Reaction
                      1. The enthalpy change that accompanies a reaction in the molar quantities expressed in a chemical equation under standard conditions, all reactants and products being in their standard states
                      2. Standard Enthalpy Change of Combustion
                        1. The enthalpy change that takes place when one mole of a substance reacts completely with oxygen under standard conditions, all reactants and products being in their standard state
                        2. Standard Enthalpy Change of Formation
                          1. The enthalpy change that takes place when one mole of a compound is formed from its constituent elements under standard conditions, all reactants and products being in their standard states
                        3. Determining the enthalpy change
                          1. q= m x c x delta t
                            1. q - enthalpy change (Joules)
                              1. m - mass of surroundings involved in heat exchange
                                1. c - specific heat capacity
                                  1. delta t - temperature change of surroundings
                                  2. Bond Enthalpies
                                    1. the enthalpy change that takes place when breaking by homolytic fission 1 mole of a given bond in the molecules of a gaseous species
                                      1. Bond breaking - ENDOTHERMIC - energy is needed to break bonds
                                        1. Bond making - EXOTHERMIC - energy is released when making bonds
                                          1. Using average bond enthalpies to determine enthalpy changes
                                            1. Delta H = the sum of the bond enthalpies of bonds broken -- the sum of the bond enthalpies of bonds made
                                          Zusammenfassung anzeigen Zusammenfassung ausblenden

                                          ähnlicher Inhalt

                                          OCR Chemistry - Atoms, Bonds and Groups (Definitions)
                                          GwynsM
                                          Alcohols
                                          Bee Brittain
                                          AQA Biology 3.3 Structure of an epithelial cell
                                          Charlotte Hewson
                                          Function and Structure of DNA
                                          Elena Cade
                                          OCR Chemistry Definitions 2.1
                                          09valentinerhi
                                          Acids and Bases
                                          Sarah Egan
                                          Biology B1.1 - Genes
                                          raffia.khalid99
                                          Introduction to the Atom
                                          Derek Cumberbatch
                                          A2 Organic Chemistry - Reactions
                                          yannycollins
                                          C7 Quiz - Energetics
                                          Leah Firmstone
                                          Cell Structure
                                          megan.radcliffe16