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Resources: Physical and chemical properties
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What properties can be determined by the senses?
Physical properties
Example of synthetic materials
Glass, synthetic metals, plastic, steel, rubber, bronze, ceramics, medicines, etc.
Examples of natural materials
Stone, wood, copper, gold, silver, diamond, lumber, oil, natural gas, etc
Which are the benefits of the development of synthetic materials?
They are cheaper, accesible, easier to obtain. Most medicines, for example, are synthetic.
Which is the relationship between natural and synthetic materials?
They are both made from natural resources
Which materials have low thermal conductivity?
Ceramics, water, concrete, fabric, rubber, wood
Which materials have high thermal conductivity?
Diamond, copper and silver
Which materials have low or none electrical conductivity?
Wood, plastic, rubber, ceramic
Example of semiconductor (electrical conductivity)
Computer circuits
Which materials have high electrical conductivity?
Copper, silver, gold, aluminum
Ability of a material to dissolve into another
Solubility
Temperature at which solid changes to liquid
Melting point
Temperature at which liquid changes into a gas
Boiling point
The amount of mass in a certain volume of matter
Density
Matter that always contains the same type of atoms arranged in the same way
Pure substance
Very small particle, basic unit that makes up all matter
Atom
Ability of a type of matter to burn easily
Flammability
Can be observed and measured only by changing the matter into a different kind of matter
Chemical property
Can be observed and measured without changing the kind of matter
Physical property
Special quality or characteristic of something
Property
Ability of a material to transfer heat
Thermal conductivity
Ability to be stretched or hammered into different shapes
Ductility
Made by changing a natural material into another
Synthetic material
Medium level of electrical conductivity
Semiconductor
Ability to bend
Flexibility
Ability of a material to allow electricity to flow through it
Electrical conductivity
Energy made by the flow of an electric current
Electrical energy


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