1. Properties of Materials

2. Chemical Properties how a material interacts with another material
“social” behavior
response to other matter (or lack of response)
reactions

3. Chemical Properties Examples: burning reaction with acid
reaction with water
corrosion/rusting/oxidation
others????
Burning – strike a match and burn a piece of paper – burn a piece of magnesium – “burn” a copper wire
Drop a piece of zinc in HCl
3. Show clip of sodium in water????

4. Physical Properties
characteristics it possesses by itself (in and of itself)
“personal” traits
response to energy

5. Physical Properties luster color density size magnetism texture odor
viscosity
crystalline structure
color
size
texture
melting point
boiling point
solubility
- videos
Demo – viscosity tubes
Pyrite for luster

6. Physical Properties Electrical properties
conductor or insulator
Optical properties – response to light
index of refraction – bending of light
transparent – light passes through
translucent – some light passes through but no distinct image
opaque – no light passes through
1. Use a digital meter on a conductor and on an insulator
2. Index of refraction – how much light bends as it passes through a substance – example: standing in waist deep water or a pencil in a beaker of water, remind students of water gel crystals we did at beginning of year
show examples of all 3 – use glass or plastic – show a Corelle plate

7. Physical Properties Thermal properties – response to heat conductivity
specific heat – how much energy it takes to change temperature
thermal expansion – example: iron wire demo
Conductivity – have them touch a table leg (wood) and a chair leg (metal) at the same time – discuss – use Ed. In. melt blocks
Specific heat – metals have low – doesn’t take much energy to heat them up or cool them down – ceramics/glass are higher – water is very high (reason it is used in cooling systems)
Ball and ring, bimetallic strip, piston and sleeve

8. Mechanical Properties
subgroup of physical
response to force or stress
force – a push or pull
stress – force causing a deformation or distortion (force per unit area)

9. Mechanical Properties Examples
workability
malleability – can be flattened
ductility – can be drawn into wire (stretched), bent, or extruded
Malleability - (show students a rolled penny)
Ductility - (show drawn wire)
Show Play doh fun factory for extrusion

10. Mechanical Properties Examples
brittleness
breaks instead of deforming when stress is applied
hardness
resistance to denting or scratching
Brittleness – snap a piece of chalk
Hardness - pass around talc
(do a metal hardness test demo – dent metal plates using a heavy weight w/ a ball bearing attached – make a shading of the dents and measure their width w/ a caliper – rank the metals)

11. Mechanical Properties Examples
elasticity
ability to return to original shape after being deformed by stress
rubber ball or piece of elastic
plasticity
retains new shape after being deformed by stress
wet clay ball or piece of saran wrap
Show happy/sad balls
Show poppers????

13. Mechanical Properties Examples
toughness
ability to absorb energy
resistance to fracture
strength
resistance to distortion by stress or force
several types: tensile, compressive, torsional, bending, shear
(toss a metal piece - scoopula, plastic water bottle, unglazed dried clay (in a baggie), a test tube (in a baggie), Corelle plate) – metals and polymers tend to exhibit more toughness than ceramics or glass – Corelle is an exception
Excellent simulation -