Transcript Objective 4.04: Describe the suitability of materials for use in

Objective 4.04: Describe the suitability of materials for use in technological
design:
Electrical conductivity
Density
Magnetism
Solubility
Malleability
Physical Property
 Property—any factor that can be used identify and
describe matter
 Helps for deciding the uses of various materials for
technology
 Physical property—observable and measureable
characteristic without changing the identity of the
substance
 Ex Mass, volume, color, hardness, and phase
 Every substance has its own unique properties
Chemical Property
 Chemical property—how the matter will change under
certain conditions, this characteristic is unique to
substances
 Ability to burn, rust, react to light, or react with acids
are chemical properties of matter
 Open the link below to check your understanding of
physical vs. chemical properties…click on Run The
Module to get it started
 http://vital.cs.ohiou.edu/?page_id=161
Review from Yesterday
 Zigzag line divides the table into metalloids, metals,
and nonmetals
Malleable and Ductile
 Malleable—able to be hammered and shaped and
rolled into thin sheets like foil
 Ductile—able to be stretched or drawn into wires
without breaking
www.alibaba.com
tiwires.com
Magnetism
 Magnetism—attraction(moving towards) or repulsion
(moving away) between like or unlike poles—iron,
cobalt, and nickel are strong magnets
www.ohiomagnetics.co
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Electricity and Heat
 Conductor—a material or substance electricity or heat
easily flows through
 Insulators—a material that electricity or heat doesn’t
easily flow through—rubber, wood, plastic, glass
 Semiconductor—a material that has conductive
properties that are variable—these can be useful for
carrying electricity under certain conditions
Density
 Density—density=mass/volume certain substances
www.stevespanglerscience.co
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have a specific density
Solubility
 Solubility—measure of how much of a substance can
dissolve in a certain amount of another substance
 Carbon dioxide will dissolve more in water than oxygen,
www.chem.ufl.edu
that’s why it is used in sodas
On page 12 in your notebook
 Write the heading Discussion Questions
 Answer discussion questions 1-4, which can be located
in your notes….
 If you don’t have your notes then find the Chemistry
Unit Notes located on my website under the chemistry
tab
Identify substances based on characteristic
physical properties:
Density
Boiling/Melting points
Solubility
Chemical reactivity
Specific heat
Temperature
 Temperature is a physical property
 Temperature that a substance melts or boils is specific
for the that substance
Temperature Review
Melting Point
Boiling Point
 Melting point—the
 Boiling point—the
temperature at which a solid
changes into a liquid
temperature at which a liquid
changes into a gas
 i.e water 0C
 i.e. water 100C
 Recall the melting point for
 Recall the boiling point for
your element
your element
http://www.harcourtschool.com/activity/hotplate
/index.html
Specific Heat
 Specific heat—the amount of heat needed to raise
1 gram (1 g) of a substance by 1 degree Celsius
 The unit of specific heat is joules per gram per degree
Celsius (J/g  C)
 Used to compare how different substances absorb heat
Specific Heat
• Which of the
following has the
lowest specific
heat?
• Which of the
following has the
highest specific
heat?
Substance
Specific Heat
(J/g  C)
Water (liquid) 4.18
Ethanol
2.44
Water (solid)
2.06
Aluminum
0.897
Lead
0.129