Honors Chem-Bonding

Metallic
Metal-Metal
Entropy
randomness
Enthalpy
Heat of Reaction (lowest energy possible)
Ionic
metal-nonmetal
Covalent
nonmetal-nonmetal
Why do metallic bonds conduct electricity?
They are surrounded by a “sea” of mobile electrons.
How can you tell if it is a strong or weak bond?
How much energy it takes to seperate the atoms, so if it has a high or low melting point.
What is the __ – __ – __ for a body-centered cube?
4-1-4
What is the __ – __ – __ for a face centered cube?
5-4-5
What is the __ – __ – __ for a hexagonel close packed thing?
7-3-7
Define a substitutional alloy.
When replacement metals in an alloy are approximately the same size, they will replace eachother in the metallic crystal, the alloys formed are called this.
When replacement alloys are different sizes, and the smaller ones fit into the spaces in the alrger ones, what is it called?
Interstitial alloy
What is an example of a substitutional alloy?
gold/silver
What is an example of an interstitial alloy?
iron/carbon
What are 4 advantages of alloys?
1) harder/higher melting point
2) more malleable
3) more durable
4) less chemically reactive
For an electron to be transfered, what does the difference in electronegativity have to at least be?
1.7
KNOW HOW TO DRAW STRUCTURE OF COMPOUNDS…..
KNOW IT…..
What does the ratio have to be for a compound to be reactive?
1:1
Polyatomic ions are…
large, complex ions
Write the formula for ammonium perchlorate.(polyatomic ion, use reference tables)
NH4ClO4 (both 4s are subscripts)
Do ionic compounds conduct electricity? Why?
No, b/c they don’t have electrons floating around.
When will electrons be shared?
When the electronegativity is similar.
Define non-polar covalent bonds.
Electrons are shared EQUALLY.
What is the best way to have a non-polar covalent bond?
BE THE SAME ELEMENT!!!
(same electronegativity)
What is a way, besides same electronegativity, to have a non-polar covalent bond?
If it is structurally balanced, despite a polar-covalent bond, it will be non-polar.
A bond = how many electrons?
2
Define polar-covalent bond.
electrons are shared UNEQUALLY.
The bigger the difference in electronegativity = more or less polar?
more
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