Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms...
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Transcript of Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms...
![Page 1: Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms (caused by electrons attracting to the positive nucleus.](https://reader035.fdocuments.in/reader035/viewer/2022062423/5697bfb81a28abf838c9f59c/html5/thumbnails/1.jpg)
Topic: Chemical Bonding
![Page 2: Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms (caused by electrons attracting to the positive nucleus.](https://reader035.fdocuments.in/reader035/viewer/2022062423/5697bfb81a28abf838c9f59c/html5/thumbnails/2.jpg)
chemical bond
• A chemical bond is a electrostatic force between atoms (caused by electrons attracting to the positive nucleus of another atom)
![Page 3: Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms (caused by electrons attracting to the positive nucleus.](https://reader035.fdocuments.in/reader035/viewer/2022062423/5697bfb81a28abf838c9f59c/html5/thumbnails/3.jpg)
Why do atoms form bonds?
To attain a noble gas configuration
How do atoms form chemical bonds?
By gaining, losing, or sharing electrons
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A + B ABWhen a bond formed = energy is released = reaction is exothermic
![Page 5: Topic: Chemical Bonding. chemical bond A chemical bond is a electrostatic force between atoms (caused by electrons attracting to the positive nucleus.](https://reader035.fdocuments.in/reader035/viewer/2022062423/5697bfb81a28abf838c9f59c/html5/thumbnails/5.jpg)
BBreaking a Bond reaking a Bond AAbbsorbs Energy sorbs Energy (endothermic)!(endothermic)!
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•When a chemical bond is formed, PE is released, the bond becomes more
stable
• You have to put energy in to brake a chemical bond, so PE increases and the overall system becomes less stable
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Ionic Bonding
Occurs between?
(type of elements)
Electrons (shared or transferred?)
• Metals and nonmetals
• Transferred, metal loses, nonmetal gains
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electron transferred from Na to Clelectron transferred from Na to Cl
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The more Na and ClThe more Na and Cl22, the , the larger the resulting NaCl larger the resulting NaCl crystal crystal
-just keep adding on to it-just keep adding on to it
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Structure of Ionic Compounds
• Ions form crystal lattice – regular 3-D pattern
or array – Ions held in fixed
positions (solid state)
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Ionic Bonding
Type of structure?
Properties
• Crystal Lattice
• High Boiling Point, High Melting Point, Hard, Brittle, Conduct electricity if melted or in solution (dissolved in water)
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lattice structure lattice structure
NaCl has its own NaCl has its own unique propertiesunique properties
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Metallic Bonding
Occurs between?
(type of elements)
Electrons (shared or transferred?)
• Metals
• Mobile sea of electrons
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Metallic Bonding
Type of structure?
Properties
• Crystal Lattice
• High Boiling Point, High Melting Point, Hard, Good Conductors electricity
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Covalent Bonding
Occurs between?
(type of elements)
Electrons (shared or transferred?)
• Nonmetals only
• shared
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Covalent Bonding
Type of structure?
Properties
• Molecules – held together by IMF (intermolecular forces)
• Low Boiling Point, Low Melting Point, soft, poor conductors of electricity
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Identify Bond Type from Formula
ZnOZnONN22OO55AlAl
CHCH33OHOHAlAl22OO33CaBrCaBr22
AuAuAgAgCOCO22
LiLi33NNNaNa22SSMgMg
CsFCsFHH22OONaClNaCl
SOSO22CuCuCHCH44
CovalentCovalent
CovalentCovalent
CovalentCovalent
CovalentCovalent
CovalentCovalent
CovalentCovalent
IonicIonic
IonicIonic
IonicIonic
IonicIonic
IonicIonic
IonicIonic
IonicIonic
MetallicMetallic
MetallicMetallic
MetallicMetallic MetallicMetallic
MetallicMetallic
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So what? Why is structure so important?
Structure determines physical properties!