Intermolecular Forces (IMF)
Opposite charges ______________, and like charges _____________.
A). repel; repel
B). repel; attract
C). attract; repel
D). attract; attract
C). attract; repel
What are Polymers?
Compounds consisting of very large molecules.
How is a Hydrogen Bond represented?
A dotted line
What overall charge must an Ionic Compound have?
ZERO!
Type I Cations: A Group elements. Cation has 1 charge.
Type II Cations: Transition Metal elements. These Cations have many charges.
What is a Polar Covalent Bond?
Chemical Bond where 2 atoms unequally share Valence Electrons (Ve-).
Chemically non-reactive.
Where are Hydrogen Bonds found in DNA?
Between the Nitrogen Bases (Nitrogenous Bases). Hydrogen Bonds hold the 2 strands in DNA together.
If a name has Roman Numerals in it, what does this tell you?
Charge of Cation
Cation is a Transition Metal and can have many charges.
a). Type I or II?
b). Name?
Ba3(PO4)2
a). Type I
b). Barium Phosphate
What does it mean when an Atom has a high Electronegativity?
The atom is great at attracting Valence Electrons towards itself in chemical bonds.
What is an Alloy?
A combination of different metals.
False
Write the Chemical Formula for:
Calcium Arsenite
Ca3(AsO3)2
a). Type I or II?
b). Name?
Fe(BrO2)2
Iron (II) Bromite
C and Cl form a Nonpolar Covalent Bond. What is happening with each element?
Carbon (C) and Chlorine (Cl) both have similar Electronegativities. This causes them to equally share the valence electrons in their Nonpolar Covalent Bond.
Identify 2 things Materials Scientists do.
1. Develop new materials
2. Optimize performance of materials that already exist.
You have 2 atoms forming a Polar Covalent Bond. N and H.
N has an Electronegativity (EN) = 3.0
H has EN = 2.1
a). Which Element has a Partial + Charge?
b). Which Element has a Partial - Charge?
a). H
b). N
Write the Chemical Formula for:
Osmium (III) Dichromate
Os2(Cr2O7)3
a). Type I or II?
b). Name?
Cu(C8H4O4)2
a). Type II
b). Copper (IV) Phthalate
You have 2 atoms forming a Polar Covalent Bond.
a). What is the Element with the Partial + Charge doing?
b). What is the Element with a Partial - Charge doing?
a). Element with Partial + Charge has Valence Electrons (Ve-) pulled away from itself in Polar Covalent Bond.
b). Element with Partial - Charge has Ve- pulled towards itself in Polar Covalent Bond.
What are Semiconductors?
Materials that have electrical conductivity values between that of a conductor and an insulator.
Hydrogen (Partial + Charge) on one water molecule forms a Hydrogen Bond with an Oxygen (Partial - Charge) on another water molecule.
Write the Chemical Formula for:
Nickel (IV) Thiosulfate
Ni(S2O3)2
a). Type I or II?
b). Name?
Cd2(C2O4)3
b). Cadmium (III) Oxalate