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Physical or Chemical Changes SPI 0807.9.8 Success Criteria: I can tell the difference between a chemical and physical change. TOC: #8. Physical or Chemical Changes notes

Physical or chemical change Brainpop

Physical Changes A change of matter from one form to another without a change in chemical properties. Changes the appearance of an object, but does not change the composition of the object. In other words, the way it looks is changed, but what it is does not change. (kind of like dressing up for a costume party) Physical changes do not form new substances. Can be fairly easily undone or reversed

Physical Changes: changes the appearance of an object, but does not actually change the composition of the object Physical Changes DO NOT Form New Substances Physical Changes Two Examples

H2O H2O H2O Physical Change: It looks different, but is still the same material. No chemical reaction has occurred. Example: Changes of state/phase ARE NOT chemical reactions In other words, liquid to solid to gas are only physical changes Water Vapor Liquid Water Solid Water H2O H2O H2O

Examples of Physical Change Melting Freezing Boiling Cutting Crushing Tearing Breaking Smashing Dissolving In every example here, the appearance is changed, but the composition remains the same. No Chemical Change!

Physical Change Examples For each of these examples, the appearance is changed, but the composition remains the same. Melting Freezing No Chemical Change! Boiling

Physical Change Examples Cutting For each of these examples, the appearance is changed, but the composition remains the same. Crushing No Chemical Change! Tearing

Physical Change Examples Breaking For each of these examples, the appearance is changed, but the composition remains the same. Smashing No Chemical Change! Dissolving

Chemical Change Is the result of a chemical reaction & a new substance is formed Can not be easily undone or reversed Some Chemical Change Indicators There may be a change in odor Heat may be given off It may explode It may fizz, foam , flash, or flame Sound may be heard (snap, crackle, pop, sizzle, bang, boom) Light may be given off It may change color Also, it may form a solid substance called a precipitate

Stand up, do 10 jumping jacks, then high five one of your neighbors. Brain Break! Stand up, do 10 jumping jacks, then high five one of your neighbors.

Chemical Change Example Iron and oxygen react to form a compound called iron oxide. Color Change: From silvery-gray to red-orange-brown 1966 VW Beetle Bare Metal-No Paint 1966 VW Beetle Rusting away Chemical Equation Fe + 3O2 2FeO3

Chemical Change Example Copper + oxygen react to form a compound called copper oxide. Color Change: From golden-brown to aqua-marine green Statue of Liberty Original look-1886 Statue of Liberty Modern look-2014 Also Called Rust Chemical Equation 4Cu + O2 2Cu2O

Chemical Change Example 10Al + 6NH4ClO4 4Al2O3 + 2AlCl3 + 12H2O + 3N2 The Space Shuttle used solid rocket propellant called APCP Space Shuttle (USA) Lift Off Chemical Equation 10Al + 6NH4ClO4 4Al2O3 + 2AlCl3 + 12H2O + 3N2

Chemical Change Example 3NaHCO3 + C6H8O7 Na3C6H5O7 + 3CO2 + 3H2O Upset stomach? You can take Alka Seltzer effervescent tablets Chemical Equation 3NaHCO3 + C6H8O7 Na3C6H5O7 + 3CO2 + 3H2O

Chemical Change Example Soured milk is the result of a chemical reaction Chemical Equation C12H22O11 + H2O 4C3H6O3

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