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Chemical vs. Physical
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Chemical Change involves breaking and/or making Bonds
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Chemical Change involves breaking and/or making Bonds
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Chemical Change involves breaking and/or making Bonds
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Chemical Change involves breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
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Physical Change doesn’t involve breaking and/or making Bonds
Dissolving Ionic Compounds is a little bit of a Gray area, but is considered to be a Physical Change.
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Physical Change doesn’t involve breaking and/or making Bonds
In General, Physical Changes are easily reversed, Chemical Changes are not!
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Chemical Change involves breaking and/or making Bonds
In General, Physical Changes are easily reversed, Chemical Changes are not!
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In the Lab, you can’t see the bonds being broken and/or made!
How do you tell if a change is a Chemical Reaction or a Physical Change?
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed-Usually see clear solution turn cloudy before solid settles.
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed-Usually see clear solution turn cloudy before solid settles. Be aware of Physical Changes that can APPEAR to be Chemical!
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change – Watch for Color Mixing Heat and/or Light Produced Gas Produced Precipitate Formed-Usually see clear solution turn cloudy before solid settles. Be aware of Physical Changes that can APPEAR to be Chemical!
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change – Watch for Color Mixing Heat and/or Light Produced – Some Physical Changes produce heat Gas Produced Precipitate Formed-Usually see clear solution turn cloudy before solid settles. Be aware of Physical Changes that can APPEAR to be Chemical!
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change – Watch for Color Mixing Heat and/or Light Produced – Some Physical Changes produce heat Gas Produced – Watch for release of trapped gas, or boiling Precipitate Formed-Usually see clear solution turn cloudy before solid settles. Be aware of Physical Changes that can APPEAR to be Chemical!
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4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change – Watch for Color Mixing Heat and/or Light Produced – Some Physical Changes produce heat Gas Produced – Watch for release of trapped gas, or boiling Precipitate Formed- Adding a solid that doesn’t dissolve doesn’t count! Be aware of Physical Changes that can APPEAR to be Chemical!
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Chemical Properties (AKA “Will they react?”)
Sodium reacts with water Gold does not react with acids Hydrogen reacts with oxygen Copper does not react with salt (NaCl)
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Physical Properties: Can be measured without trying to react the substance.
Sodium is malleable Gold has a density of 19 g/mL Hydrogen is colorless Copper conducts electricity
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Physical Properties: Can be measured without trying to react the substance.
Sodium is malleable Gold has a density of 19 g/mL Hydrogen is colorless Copper conducts electricity Note that color is a Physical Property, but a color CHANGE is an indication of a Chemical Reaction.
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