# Chemical vs. Physical.

## Presentation on theme: "Chemical vs. Physical."— Presentation transcript:

Chemical vs. Physical

Chemical Change involves breaking and/or making Bonds

Chemical Change involves breaking and/or making Bonds

Chemical Change involves breaking and/or making Bonds

Chemical Change involves breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

Physical Change doesn’t involve breaking and/or making Bonds

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.

Physical Change doesn’t involve breaking and/or making Bonds
In General, Physical Changes are easily reversed, Chemical Changes are not!

Chemical Change involves breaking and/or making Bonds
In General, Physical Changes are easily reversed, Chemical Changes are not!

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?

4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change

4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced

4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced

4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed

4 OBSERVATIONS that Tend to indicate that a change is Chemical:
Color Change Heat and/or Light Produced Gas Produced Precipitate Formed

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.

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!

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!

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!

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!

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!

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)

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

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.