Inter-molecular
As the strength of the forces between molecules increases, the energy required to change the state of the substance _____
Increases
What is the definition of polarity?
The uneven distribution of charges in a molecule
What is the ability of the surface of a liquid to form a "skin" called?
Surface tension
What is materials science?
The scientific study of the properties and applications of materials.
When a substance has _____ inter molecular Forces, it requires more energy when in the solid state to become a liquid
Strong
What is the definition of electronegativity?
It is the tendency of an atom to pull electrons toward itself
What is capillary action
The phenomenon where water appears to climb up narrow tubes.
What are Polymers
Polymers are compounds composed of very large molecules
What is a hydrogen bond?
Where the inter molecular forces in which a hydrogen atom that is bonded to a highly electronegative ion is attracted to a partial negative charge on a nearby molecule
What is a dipole
A molecule with two different poles
In order for liquid water to boil and become a gas, _______ between the water molecules must be broken
Hydrogen bonds
What are semi-conductors
Materials that have electrical conductivity between a conductor and an insulator
Why do Ionic compounds have high melting points?
Strong attractive forces hold there ions tightly together
What is the difference between non-polar covalent bond and a polar covalent bond
In a non-polar covalent bond the electron cloud is evenly dispersed. In a polar covalent bond, it is not
Why does ice float on water
The amount of space between molecules In solid water is greater than that in liquid water, resulting in solid water having lesser density than that of liquid water
What is a composite?
Different materials that are combined to form a new material with its own unique properties
A hydrogen bound is usually represented by a, _____, that connects the hydrogen-bonded hydrogen to the partial negative charge on another molecule
Dotted line
How do you determine the polarity of a molecule that contains more than 2 atoms?
It is determined by the polarity of the individual bonds and the three-dimensional arrangement of the molecule
Why does water expand when it freezes?
The molecules loose kinetic energy and slow down, allowing hydrogen bonds to form and the distance between the molecules to increase
The greater the attractive force are between molecules ina thermoplastic, the _________ the material will be.