1 / 5

Understanding Bond Energies: Breaking and Making Bonds in Chemical Reactions

This section explores the concept of bond energies and their significance in chemical reactions. It presents a sample calculation for the combustion of methane (CH4) reacting with oxygen (O2) to form carbon dioxide (CO2) and water (H2O), highlighting the energy involved in breaking and forming bonds. The energy change (ΔH) is calculated as the difference between the energy required to break the bonds and the energy released when new bonds are formed, resulting in an exothermic reaction. An energy level diagram illustrates these energy changes.

calista-schneider
Télécharger la présentation

Understanding Bond Energies: Breaking and Making Bonds in Chemical Reactions

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. Section 4 d Breaking and making bonds

  2. Bond energies • The table below shows the amount of energy needed to break the bond and the amount of energy released when that bond is made

  3. sample calculation CH4(g) + 2O2 (g)  CO2 (g) + 2H2O (g) ΔH = bonds broken – bonds made = 2640 – 3338 = - 700 kJ

  4. Energy level diagram - exothermic • The energy level diagram below includes the energy taken into break bonds and the energy released when making new ones

  5. Same energy level diagram

More Related