An atom is the smallest chemical unit, composed of protons, neutrons, & electrons.
A molecule is the simplest structural unit of an element or compound.
Define atom and molecule.
100
Mass per unit volume of a material.
What is density?
100
The process of drying out timber after conversion.
What is seasoning?
100
Initially coiled chains are stretched
(no permanent deformation).
What is elastic
100
Synthetic polyamide fiber made from Adipic acid and a diamine.
What is nylon
200
A mixture that contains at least one metal. This can be a mixture of metals or a mixture of metals and non-metals.
What is an alloy
200
Tensile strength, stiffness, ductility, and toughness.
What are the four mechanical properties?
200
Natural timber is a composite of cellulose fibers in a lignin matrix.
It is normally classified as Softwood (coniferous) or Hardwood (deciduous).
What is timber and how is it normally classified?
200
Formed by making covalent bonds
which form strong, primary cross-links
between adjacent polymer chains.
Have a rigid three-dimensional structure.
What are thermosets
200
Composed of cellulose, Obtained from the
bud of the cotton plant.
What is a natural fiber
300
A mixture composed of two or more substances (materials) with one substance acting as the matrix or glue.
What is a composite?
300
Taste, smell, appearance, texture, and color.
What are the aesthetic characteristics?
300
Wood finishing prevents water absorption, prevent attack by organisms or chemicals, improve or change appearance, and modify other properties.
What are the effects of wood finishing?
300
Can be recycled infinite times
What is glass
300
Can be used to measure the force of an
impact.
What are Piezoelectric materials
400
Ionic (Crystalline structure)
Covalent (Shared electrons)
Metallic (Sea of Electrons)
What are the three different types of bonds and briefly describe each
400
Tensile strength- the ability of a material to withstand pulling forces.
Stiffness- the ability of a product to withstand bending.
Toughness- the ability of a material to resist the propagation of cracks.
Ductility- the ability of a material to be drawn or extruded into a wire or other extended shape.
Describe the four mechanical properties?
400
No vessels or pores so the density of the wood is much more uniform
Describe softwood timber
400
Extremely Hard
Brittle
Transparent
Non-reactive
Additions of different compounds can
make for interesting aesthetic properties
What is glass
400
a combination of two or more materials that are bonded together to improve their mechanical, physical, chemical or electrical properties.
What are composites
500
Materials can be classified into groups according to similarities in their micro structures and properties.
What can materials be classified into?
500
Thermal expansion is a measure of the degree of increase in dimensions when an object is heated.
Expansivity can be measured as the fractional increase in dimension per kelvin increase in temperature.
What is thermal expansion and how expansivity can be measured?
500
Located in Temperate and Tropical zones, broad leaves that are usually lost in the winter, and seeds enclosed in type of fruit or nut
Describe hardwood forests
500
resistance to tensile
and compressive
forces,
Thermal conductivity
Transparency
What are the glass benefits of glass
500
Have one or more properties that can be
dramatically altered.