1 / 12

4/10/12 - Bellringer

4/10/12 - Bellringer. Explain what is happening at a molecular level when energy is added or removed. Grade Worksheets. 23.4 – Reaction Rates and Energy. Part A. Objectives. Identify the source of energy changes in chemical reactions.

lucas
Télécharger la présentation

4/10/12 - Bellringer

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. 4/10/12 - Bellringer • Explain what is happening at a molecular level when energy is added or removed.

  2. Grade Worksheets

  3. 23.4 – Reaction Rates and Energy Part A

  4. Objectives • Identify the source of energy changes in chemical reactions. • Compare and contrast endothermic and exothermic reactions.

  5. Chemical Kinetics • The area of chemistry concerned with the speed at which reactions occur

  6. Collision Theory • In order for reactants to form products the reactants must collide with enough energy to start the reaction (activation energy)

  7. Energy Changes • Chemical reaction involve energy exchange • Breaking chemical bonds requires energy • Forming chemical bonds releases energy

  8. More Energy Out • In exergonic reactions, the energy required to break bonds is lessthan the energy released from new bonds • The energy given off is usually light • Exergonic - releases more than absorbs

  9. Exothermic Reaction • Give off energy in the form of heat

  10. More Energy In • In endergonic reaction, more energy is required to break bonds than to form new ones, energy is needed for the reaction to occur • Endergonic – absorbs more than releases

  11. Endothermic Reaction • If the energy needed/absorbed is heat

  12. In-Class Assignment/Homework • 23.3+4 DR WKT • 23.4 RFN WKT • #2, 4, 10-13 ONLY

More Related