Two categories of bonds are formed between the 2 atoms, what are the strong bonds called? What are the weak bonds called?
What makes primary bonds the strong bonds?
they involve the exchanging or sharing of electrons
What are three types of primary bonds?
In what type of bond does a metal give an electron to an atom that needs extra which causes both atoms to be charged (one + the other -); and because of this charge, there is an attraction between them?
In what type of bond are materials such as ceramics usually brittle and poor electrical conductors?
What type of bond occurs when two atoms share electrons in their outer shell; creating full shells for both and are very strong?
What is a good example of a covalent bond?
diamond; it is hard and has a high melting point
Think tetracucline staining for what kind of bond?
What type of bond have the electron shared among all the atoms in a lattice formation?
What type of bond has an electron cloud that causes good thermal and electrical conductivity?
What type of bonds are weak, do not share or transfer electrons leading to deformation or fracture?
What are 2 types of secondary bonds?
van der Vaals
What are the three basic forms that the physical structure of a material may take on?
What are 5 things that affects material classification?
What form has shape and volume?
what form has volume but no shape?
What form has neither shape or volume?
primary atomic bonds hold ______ together, giving them strength and stability; the most stable have a regular crystalline structure with molecules in a regularaly spaced pattern
If molecules in a solid are arranged in a random form with no regular pattern, the solid is less stable and called what?
What 7 characteristics are used to describe solids?
What is the densest tooth structure? What is the densest restorative material?
________ is used to define a material's resistance to wear and abrasion
What are two of the hardest materials?
If deformation is not permanent and the material recovers from the force completely, it has good what?
What is the stiffness of a material measured by?
young's elastic modulus
Stiffer materials have a _________ modulus
materials with poor ductility are classified as what?
_______ is brittle and cannot undergo much tensile stress without fracture; its ultimate strength is about equal to its elastic limit
gold is very _______ and _________; it is easily compressed and formed into a thin sheet
The combination of malleability and ductility gives a metal the ability to resist fracture or abrasion even at fine margins, giving the metal what?
In most cases, _______ tend to be ductile and malleable, but _______ are brittle
The study of flow of liquids is the science of what?
The higher the viscosity, the _______ is a liquid's ability to resist flow
value of viscosity depend on the nature of the fluid; thin fluids have _____ viscosity and thicker fluids have ____ viscosity
usually the viscosity of liquids ________ as the temperature increases
liquids that flow more easily under mechanical forces, fluoride gels are often advertised as this kind of liquid