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Physical and Chemical Properties
Transcript of Physical and Chemical Properties
Physical and Chemical Changes
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)
(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
Matter is anything that has mass and volume.
All matter is unique in some way from all other matter.
There are two types of properties: 1. Physical properties
2. Chemical properties
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:
(change in phase)
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?
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.
Solubility (ability to dissolve in water.)
Melting and Boiling Point
State of matter