Chap 1-5 Flashcards
Bulk mechanical properties
Density Elastic moduli Strength Creep Toughness
Non-mechanical bulk properties
Thermal
Electrical
Optical
Magnetic
Surface properties
Corrosion
Oxidation
Friction
Wear
Economic properties
How much does the material cost
Are materials inexhaustible, sensitive to the public eye or provided by one sole provider?
Is it local and sustainable?
Manufacture Properties
How easy is the material to work with?
Can you cut it/mould it with the tools you have?
Common sense basically
Aesthetic properties
Colour, feel, appearance etc.
Reading elements periodic table entries
Top number: atomic mass, total number of protons and neutrons
Bottom number: atomic number, number of protons
Equation using moles, mass and atomic mass
Mass=moles*atomic mass
Definition of atoms with non-net zero charge
Positive charge=electron deficit=cation
Negative charge=electron rich=anion
Definition of isotopes
When the number of neutrons isn’t equal to the number of protons. Proton number remains the same but neutron number changes
Mass defect
Weight of an atom’s nucleus is less than the sum of the weights of its isolated component particles. This difference is called the mass defect. It is due to binding energy and E=MC^2
Two types of chemical bonding
Primary bonding: involves sharing or donating electrons between attoms to form more stable electron configurations
Secondary bonding:weak in comparison to PB. Usually formed from uneven charges (postive and negative atoms)
Covalent bonding and properties
Formed between two non-metallic atoms. Electrons are shared between them to complete each outer shell.
High elastic modulus, strength and melting point.
Low conductivity
Ionic bonding and properties
Between a metal and a non metal atom. Non metal gives an electron to metal atom.
High strength, elastic modulus and melting
Poor conductivity
Metallic bonding and properties
Positive nucluis surrounded by sea of elctrons.
High conductivity, melting point
Malleable
