1 / 6

Unit 1: Basic Concepts of Chemistry

Unit 1: Basic Concepts of Chemistry. Energy and Chemical Reactions Part II. Energy and Chemical Reactions. Energy transfer of physical and chemical processes. Physical processes that have energy transfers:. Chemical processes that have energy transfers:.

geona
Download Presentation

Unit 1: Basic Concepts of Chemistry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Unit 1: Basic Concepts of Chemistry Energy and Chemical Reactions Part II

  2. Energy and Chemical Reactions Energy transfer of physical and chemical processes Physical processes that have energy transfers: Chemical processes that have energy transfers: We call this transferred energy … Enthalpy, H

  3. Energy and Chemical Reactions Enthalpy changes for chemical reactions Almost all chemical reactions either release or absorb heat Reactant Reactant Product + HEAT Reactant Reactant Product + HEAT

  4. Energy and Chemical Reactions Enthalpy Changes for Chemical Reactions Standard Reaction Enthalpies, ∆rHo The decomposition of water vapor … Sucrose, C12H22O12 can be oxidized to CO2 and H2O and the enthalpy change can be measured under constant pressure. 2C12H22O12+ 23O2 24CO2+ 22H2O ∆rHo= -5645 KJ/mol What is the energy transferred as heat by burning 5.0 g sucrose?

  5. Energy and Chemical Reactions Calculating Enthalpies of Reaction, ∆rHo Standard Enthalpy of Formation Values, ∆fHo An Enthalpy of Formation is just a special, standardized type of reaction enthalpy … ∆rHo= ∑ ∆fHo(products) -∑∆fHo(reactants)

  6. Energy and Chemical Reactions Calculating Enthalpies of Reaction, ∆rHo Calculate the heat of reaction for each of the following reactions: 2 CO(g) + O2(g) ---> 2 CO2(g)  • 2 H2S(g) + 3 O2(g) ---> 2 H2O(l) + 2 SO2(g)  • If 2 Liters of hydrogen sulfide gas reacts at STP, how much heat is transferred?

More Related