Physical Properties

Characteristics of a substance that can be observed without changing the substance

Examples: color, shape, mass, length, and odor

Chemical Properties

Characteristics of a substance that indicates how it will react with other substances (“the ability to…”)

The original substance is changed in observing a chemical property

Examples: flammability, combustibility, neutralization, and ‘reactions’

Examples of Properties

Questions: PropertiesP =Physical Property C =Chemical Property

1. The red color of an apple2. The ability of iron to rust3. Flammability of Gasoline4. Smell of roses5. Size of a pencil6. Density7. Acids react with bases

Physical Changes

A change where the original substance still exists

The substance only changes form

Examples: cut, dissolved, absorbed, a phase changeClick next slide to play video

Chemical Changes A change where a new substance is produced; the atoms

have been rearranged

When you can’t get the original substance back

Properties of the new substance will be different

Chemical ChangesEasily identified by

the term ‘reacts’ Other ‘clues’:Release of a gasChange in colorRelease of

energy (heat, light, etc.)

Formation of a precipitate

Chemical ChangesClick next slide to play video

Questions: ChangesP = Physical Changes; C= Chemical

Changes

8. Cutting wood9. Digestion 10.Baking bread11.Dissolving salt in water12.An apple rotting13.Melting ice14.Silver tarnishing

Law of Conservation of Mass

Changes in state does not change the number of molecules in the substance or mixture

100 g of ice = 100 g of water = 100 g of water vapor

Rock Cycle15

19

16

1718Metamormphi

c Rock MELTING to

Magma

Magma COOLING to

Igneous Rock

Weathering of Igneous Rock

to form Sediment

Cementation of Sediment to

form Sedimentary

Rock

More Practice: ChangesIdentify as Chemical (C) or Physical Changes (P)

1. A change in state2. Newspaper turning yellow3. Burning a candle4. Carving a turkey5. Milk going sour6. Antacid tablet in water7. Acid rain wearing down a marble statue8. Ice melting in a soda9. Sugar dissolving in Iced Tea10. Water turning to steam in your shower