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Physical and Chemical Properties

Chapter 3
by

Cindy Mullikin

on 13 March 2014

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Transcript of Physical and Chemical Properties

Physical Properties
Chemical Properties
Physical and Chemical Changes
Physical Change:
a change in a substance that does not change what the substance is. The chemical structure is not changed.
What are examples of physical change?
A change in the substance's size or shape.
Change in phase:

Melting (solid to liquid)

Evaporation
(boiling)
(liquid to gas)
Condensation (gas to liquid)
Freezing (liquid to solid)
Sublimation (solid to gas)
Deposition or Desublimation (gas to solid)
How can you cause a physical change?
What are some clues or evidence that a physical change has occurred?
What could you do to these items to cause a physical change to occur?
Chemical Change: a change in which a substance is changed into a different substance. (You’ve changed what it is.)
There is a change in shape, but the atoms' mass before and after the physical change stays the same.
Examples of Chemical Properties

t
Matter Song
4 States of Matter Song
Matter

Matter anything that has mass and volume.
All matter is unique in some way from all others.
If you know enough about a substance, you can figure out what it is.
If you know what a substance is, you can know all types of things about it.
All matter has 2 types of properties: Physical properties and chemical properties.
Matter
Color
Density
Size
Shape
Magnetism
Melting and Boiling Point
Hardness
Odor
Taste
State of matter

Texture
Luster (shine)
Flexibility
Heat conductivity
Electrical conductivity
Solubility (ability to dissolve in water.)
Shape
Viscosity
Ductility
Malleability
a characteristic of a substance that can only be observed by changing it into a different substance.
Ability to burn
Ability to tarnish
Ability to rust
Ability to decompose
Ability to react with other chemicals
Ability to do acid/base reactions
Physical changes might be caused by:
Grinding
Cutting
Crushing
Bending
Breaking
Heating/cooling
(change in phase)
squishing
Evidence that a physical change has occurred might include:

Change in shape
Change in form
Change in size
Change in phase (This is always a physical change!)

Physical changes are usually reversible but not always.
What are examples of chemical changes?
Burning
Rusting
Tarnishing
Decomposing
When does a chemical change occur?
Chemical changes occur when a chemical reaction causes bonds between atoms to break or to form.
Evidence that a chemical change has occurred might include:
A color change
An odor change
Formation of a precipitate (you mix two liquids and make a solid)
Gas is formed (bubbles)
Changes in physical properties.
Full transcript