Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”
-
Upload
jessica-jenkins -
Category
Documents
-
view
216 -
download
0
Transcript of Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”
![Page 1: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/1.jpg)
Metallic Bonds
ChemistryMrs. Coyle
![Page 2: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/2.jpg)
Cations packed in “a sea of electrons”
![Page 3: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/3.jpg)
Metals
Metals consist of closely packed cations floating in a “sea of electrons”.
All of the atoms are able to share the electrons.
The electrons are not bound to individual atoms.
![Page 4: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/4.jpg)
Properties of Metals
Good conductors Ductile Malleable
Electrons act as a lubricant, allowing cations to move past each other
![Page 5: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/5.jpg)
Metals have a Crystalline Structure
Packed spheres of the same size and shape: Body Centered Cubic Face Centered Cubic Hexagonal Close Packed
![Page 6: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/6.jpg)
Body Centered Cubic
Chromium
![Page 7: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/7.jpg)
Face-Centered Cubic
Gold
![Page 8: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/8.jpg)
Hexagonal Close-Packed
http://phycomp.technion.ac.il/~pavelba/hcpS.gif Zinc
![Page 9: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/9.jpg)
Alloys
Mixtures of two or more elements, at least one of which is a metal.
Made by melting, mixing, then cooling the metals.
May contain non-metals like carbon.
![Page 10: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/10.jpg)
Alloys
Properties are superior to their components. Sterling silver
92.5% Ag, 7.5% Cu Harder than silver
Bronze 7:1 Cu to Sn (tin)
![Page 11: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/11.jpg)
Alloys
Stainless Steel Fe 80.6%, Cr 18%, C 0.4%, Ni 1%
Cast Iron-Fe 96%, C 4%
![Page 12: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/12.jpg)
Types of Alloys
Two types of formation:Substitutional alloys
Similar size atoms – replacement
Interstitial alloys Different size atoms – smaller ions fill
interstices (spaces between atoms)
![Page 13: Metallic Bonds Chemistry Mrs. Coyle. Cations packed in “a sea of electrons”](https://reader036.fdocuments.us/reader036/viewer/2022062421/56649e4c5503460f94b41def/html5/thumbnails/13.jpg)
Why is a metal ductile but an ionic compound is not?