Intro to chemistry Therm o breaking forming

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Presentation transcript:

Intro to chemistry Therm o breaking forming A. All chemical reactions involve the ________ and ________ of bonds. breaking forming

Intro to chemistry Therm o sum endothermic absorbed 1. The energy required to break all of the reactant bonds is a ______ of all of the average bond energies in the reactants. This is an ___________ term. Energy must be ________ in order to break bonds! sum endothermic absorbed

Intro to chemistry Therm o 2. The energy released in making all of the product bonds is a ______ of all of the average bond energies in the products. This is an _________ term. Energy is _______ when new bonds form! sum exothermic released

Intro to chemistry Therm o Overall enthalpy 3. The ________ enthalpy change in a reaction relates the bond breaking (endothermic) process and the bond making (exothermic) process. The total _________ change can be negative (exothermic) or positive (endothermic) depending on the relative magnitude of the two (breaking and making) processes. enthalpy

ΔHrxn = Ʃn(ΔHbonds broken) - Ʃn(ΔHbonds formed) Intro to chemistry Therm o The enthalpy change, ΔH, for a reaction can be calculated from a list of bond _______ and the following understanding: ΔHrxn = Ʃn(ΔHbonds broken) - Ʃn(ΔHbonds formed) energies

Intro to chemistry Therm o

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