1 Ch 7 Chemical Reactions 7.1 Chemical Reactions Alter Arrangements of Atoms.
Ch. 16 - Chemical Reactions
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Ch. 16 - Chemical Reactions IV. Energy & Chemical Reactions Energy Changes Exothermic Reactions Endothermic
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Ch. 16 - Chemical Reactions. IV. Energy & Chemical Reactions. Energy Changes Exothermic Reactions Endothermic Reactions. A. Energy Changes. During a chemical reaction… energy is used to break bonds energy is released when new bonds are formed. breaking bonds. making bonds. - PowerPoint PPT Presentation
Transcript of Ch. 16 - Chemical Reactions
![Page 1: Ch. 16 - Chemical Reactions](https://reader035.fdocuments.in/reader035/viewer/2022071807/56813012550346895d958aa4/html5/thumbnails/1.jpg)
Ch. 16 - Chemical Reactions
IV. Energy & Chemical Reactions
Energy Changes Exothermic Reactions Endothermic Reactions
![Page 2: Ch. 16 - Chemical Reactions](https://reader035.fdocuments.in/reader035/viewer/2022071807/56813012550346895d958aa4/html5/thumbnails/2.jpg)
A. Energy Changes
During a chemical reaction…energy is used to break bondsenergy is released when new
bonds are formed
breakingbonds
makingbonds
![Page 3: Ch. 16 - Chemical Reactions](https://reader035.fdocuments.in/reader035/viewer/2022071807/56813012550346895d958aa4/html5/thumbnails/3.jpg)
B. Exothermic Reaction
reaction that releases energy
energy released by making new bonds outweighs energy req’d to break old bonds
H2(l) + O2(l) H2O(g) + energy
reaction that powers the space shuttle lift-off
![Page 4: Ch. 16 - Chemical Reactions](https://reader035.fdocuments.in/reader035/viewer/2022071807/56813012550346895d958aa4/html5/thumbnails/4.jpg)
C. Endothermic Reaction
reaction that absorbs energy
energy req’d to break old bonds outweighs energy released by making new bonds
process used to obtain aluminum from aluminum ore
2Al2O3 + energy 4Al + 3O2