Physical Changes and Chemical Changes
Physical Change
Chemical Change
Definition: A change in a substance that does
not include a change in the identity of that
substance
Definition: A change in which one or more
substances are converted into different
substances (Formula Change)
Examples:
Examples:
Bend (Ductile)
Formula Change (Chemical Reaction)
Cut
Break
Add Color
Phase Change
Solid to Liquid: _____________________
Liquid to Gas: _____________________
Gas to Liquid: _____________________
Liquid to Solid: _____________________
Gas to Solid: _____________________
Solid to Gas: _____________________
Hammer into a sheet (malleable)
Pull into a wire (Ductile)
Mold into a specific form
Dissolves In Water
1. Gives Off or Takes-Up Energy
• endothermic takes up energy
• exothermic gives off energy
(becomes something new)
2. Changes Color
(becomes something new)
3. Evolves Gases/Bubbles
(becomes something new)
4. Forms a precipitate
(becomes something new)
Burn something
Flows Slowly (Viscosity)
PHYSICAL CHANGE
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The appearance may change, but you still have the same substance as before – can be reversed and no
energy is produced
CHEMICAL CHANGE
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A change that occurs when materials react or are broken into different materials
In a chemical change the physical appearance changes and you have a different substance than what
you started out with
BOTH physical and chemical properties may change
Energy may be produced or absorbed
Usually chemical changes cannot be reversed unless you make another chemical change
Physical Properties and Chemical Properties
Physical Property
Chemical Property
Definition: A feature or characteristic of matter
which can be observed without changing the
identity of the matter
Definition: How one thing reacts with another
Examples:
Examples:
Color
Flammability – how well something
Density
reacts with oxygen to produce heat/flame
Conductivity – thermal and electrical
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Reactions with acid – how well
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something reacts with an acid. Main
Smell
Malleability
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Melting Point
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Taste
Boiling Point
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Texture
Solubility
reaction with and acid results in
bubbling. When an acid reacts with
another substance, usually hydrogen gas
(which is highly explosive) is released
Other Reactions – include heat being
released, bubbling, strong odor, smoke,
flame, change of color, etc.
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Non-Reactivity – when something fails to
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react…
example…
platinum dropped in acid
Magnetism
has no reaction…
nothing happens. Even
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when held into a flame, platinum has no
___________________________________________
reaction