Notes Science Tennessee SPI Objective: Physical or Chemical Changes Notes Science Tennessee SPI Objective: Interpret the results of an investigation to determine whether a physical or chemical change has occurred. Instructions 1) First click on "View" from the top-menu bar. 2) Then click on "Slide Show" from the drop-down menu. 3) Then use the right-arrow button on your keyboard to advance through this presentation. Essential Learning Students will examine scenarios and decide if a physical or chemical change has occurred. Essential Question(s) How do I tell the difference between a physical and chemical change?

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Notes Science 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

SPI 0807.9.8 Physical or Chemical Changes Notes Science 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! DO NOT Physical Changes Two Examples

H2O H2O H2O Notes Science Physical Change: SPI 0807.9.8 Physical or Chemical Changes Notes Science Physical Change: It looks different, but is still the same material. No chemical reaction has occurred. Example: Changes of state/phase ARE NOT chem reactions In other words, liquid to solid to gas are only physical changes Liquid Water Solid Water Water Vapor H2O H2O H2O

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Notes Science 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 or Chemical Changes Physical Change Examples SPI 0807.9.8 Physical or Chemical Changes Notes Science Physical Change Examples Melting For each of these examples, the appearance is changed, but the composition remains the same. Freezing Boiling No Chemical Change!

Physical or Chemical Changes Physical Change Examples SPI 0807.9.8 Physical or Chemical Changes Notes Science 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 or Chemical Changes Physical Change Examples SPI 0807.9.8 Physical or Chemical Changes Notes Science Physical Change Examples Breaking For each of these examples, the appearance is changed, but the composition remains the same. Smashing No Chemical Change! Dissolving

Physical or Chemical Changes Link: Chemical and Physical Changes-Video SPI 0807.9.8 Physical or Chemical Changes Notes Science 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 Link: Chemical and Physical Changes-Video

Notes Science Chemical Change Example SPI 0807.9.8 Physical or Chemical Changes Notes Science Chemical Change Example Iron and oxygen react to form a compound called iron oxide. Color Change: From silvery-gray to red-orange-brown Commonly Called Rust 1966 VW Beetle Bare Metal-No Paint 1966 VW Beetle Rusting away Chemical Equation Fe + 3O2 2FeO3

Notes Science Chemical Change Example SPI 0807.9.8 Physical or Chemical Changes Notes Science Chemical Change Example Copper + oxygen react to form a compound called copper oxide. Color Change: From golden-brown to aqua-marine green Also Called Rust Statue of Liberty Original look-1886 Statue of Liberty Modern look-2014 Chemical Equation 4Cu + O2 2Cu2O

Notes Science Chemical Change Example SPI 0807.9.8 Physical or Chemical Changes Notes Science Chemical Change Example The Space Shuttle used solid rocket propellant called APCP Burning APCP results in a very powerful chemical reaction Space Shuttle (USA) Lift Off Chemical Equation 10Al + 6NH4ClO4 4Al2O3 + 2AlCl3 + 12H2O + 3N2

Notes Science Chemical Change Example SPI 0807.9.8 Physical or Chemical Changes Notes Science Chemical Change Example Upset stomach? You can take Alka Seltzer effervescent tablets Drop the tablets in water and you get a chemical reaction Chemical Equation 3NaHCO3 + C6H8O7 Na3C6H5O7 + 3CO2 + 3H2O

Chemical Change Example SPI 0807.9.8 Physical or Chemical Changes Notes Science Chemical Change Example Soured milk is the result of a chemical reaction Bacteria converts lactose to lactic acid Chemical Equation C12H22O11 + H2O 4C3H6O3

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Science Questions Sample Question Here is an example of a question you might see on a quiz or test.

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Science Questions Sample Question …a question you might see on a quiz or test.

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Science Questions Sample Question Here is an example of a question you might see on a quiz or test.

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Science Questions Sample Question …a question you might see on a quiz or test.

Physical or Chemical Changes SPI 0807.9.8 Physical or Chemical Changes Science Questions Sample Question …a question you might see on a quiz or test.