chemical & physical properties ppt
TRANSCRIPT
Chemical & Physical Properties of Matter
Chemical Properties
• Characteristics that are observed ONLY when a substance changes into a different substance
Chemical Properties
• Types of Chemical Properties:• Combustible/flammable:
• able to burn
• Examples & Facts:• all chemicals come with a
label that identifies their level of flammability
Chemical Properties
• Types of Chemical Properties:• Combustible/flammable:
• able to burn• http://youtu.be/EZ3JT2nWfMA
− 1:30 Combustion of Mg
• Examples & Facts:• oxygen & hydrogen are very flammable
gases• carbon dioxide is not a very flammable
gas
Hay Bale combusting
• http://www.youtube.com/watch?v=zRNCrHqD0zE
• Stop at 35 seconds
Chemical Properties
• Types of Chemical Properties:• Reactivity:
• how easily a substance reacts with another substance
• http://youtu.be/sS3cIK9jlB8− 1:10 min Alkali metals reaction to water
• Examples & Facts:• many chemicals react with
water or oxygen• all chemicals come with a
label that identifies their level of reactivity
Chemical Properties
• Types of Chemical Properties:• Reactivity:
• how easily a substance reacts with another substance
• Examples & Facts:• corrosion: slow reaction
& wearing away of metals (rusting, tarnishing)
Examples of Chemical Changes
Physical Properties
• Characteristics that can be observed without changing the substance into something else
Physical Properties
• Types of Physical Properties:• color• texture• odor• taste• hardness• magnetic• boiling, melting, & freezing
points
Physical Properties
• Types of Physical Properties:• Luster:
• shininess or dullness
• Examples & Facts:• most metals are shiny• diamonds have a lot of
luster• many minerals are dull
Physical Properties
• Types of Physical Properties:• Brittleness:
• how easily a substance breaks into pieces
• Examples & Facts:• very brittle substances
may crumble or break with very little force
Physical Properties
• Types of Physical Properties:• Brittleness:
• how easily a substance breaks into pieces
• Examples & Facts:• many rocks & minerals
are brittle• chalk is brittle because
it crumbles easily
Physical Properties
• Types of Physical Properties:• Malleable:
• can be pounded into shapes
• Examples & Facts:• aluminum is very malleable• clay is also malleable• substances that are malleable
are usually not very brittle
Properties Song
• http://www.youtube.com/watch?v=uJOGy0dgmUU
Physical Properties
• Types of Physical Properties:• Ductile:
• can be pulled out into a long wire
• Examples & Facts:• substances may be both malleable
& ductile• copper is very malleable &
ductile• substances that are ductile
are usually not very brittle
Physical Properties
• Types of Physical Properties:• Conductive:
• can transmit heat and/or electricity
• Examples & Facts:• a substance may conduct heat,
electricity, neither, or both• most metals are good
conductors
Physical Properties
• Types of Physical Properties:• Conductive:
• can transmit heat and/or electricity
• Examples & Facts:• pots & pans are made out of metals
that are good heat conductors
Physical Properties
• Types of Physical Properties:• Soluble:
• can be dissolved in a liquid
• Examples & Facts:• substances that are “water-
soluble” will dissolve in water• salt & sugar are soluble in
water• substances that don’t dissolve
are “insoluble”
Overview of Physical & Chemical properties• http://youtu.be/oF0lN0jZYx0
• Physical and Chemical Properties visual 2:30 min
• http://www.youtube.com/watch?v=C4pQQQNwy30
• Chemistry - The Physical Properties and Chemical Properties of Matter − 6 min
Models are representations of objects or systems.
Models can be used for:• Understanding something• Predicting• Picturing things in your mind• Explain scientific theories
Physical Models
• look like the object they model.
Mathematical models
• Made up of mathematical equations and data
Conceptual models
• Systems of ideas.
Limitation of Models
• They don’t act exactly like the things they model or they may not look like the things they represent. Scale might be incorrect.
• What is wrong with this model?
Extra information on Chemical & Physical • http://
education-portal.com/academy/lesson/matter-physical-and-chemical-properties.html#transcript Just watch from 1:50 to 4:20 on video
• http://www.youtube.com/watch?v=ritaljhhk7s Pharaoh Snake Reaction (Mercury(II) thiocyanate decomposition) 3:11 min
• http://www.youtube.com/watch?v=PQ6IsCbNZAQ Sulfuric Acid vs Sponge - Chemical Reaction 1 min