Chemical vs. Physical Change 6 th Grade

There are two types of properties: PhysicalPropertiesChemicalProperties

Physical Properties can be observed without changing without changing the matter: shape state (solid, liquid, or gas) density color smell appearance

Physical Properties of this ball: round shape solid red color

Chemical Properties can only be tested by changing by changing the matter: flammability (will it burn?) oxidation (will it rust?) volatility (will it explode?) reactivity (will it react to chemicals?)

Chemical Properties of this flask: not flammable not flammable won’t rust won’t rust can explode if can explode if over heated won’t react to acid won’t react to acid

Physical Properties What are some Physical Properties for this hamburger? solid round bun many colors smells tasty

Chemical Properties What are some Chemical Properties for this hamburger? can burn (except lettuce and pickles) won’t rust won’t explode will react to stomach acid by dissolving

Physical Properties What are some Physical Properties for propane gas? gas no fixed shape invisible Smells like rotten eggs very light density

Chemical Properties What are some Chemical Properties for propane gas? will burn easily gas won’t rust (but tank will) can explode! can react with other chemicals

Physical Property Is it a Physical Property Chemical Property or a Chemical Property? Strawberries are red with a green top. Physical Property Physical Property! It doesn’t change the strawberry to check its color.

Apples will oxidize and turn brown if left out in air. Chemical Property Chemical Property! It will change the apple to wait for it to brown. Physical Property Is it a Physical Property Chemical Property or a Chemical Property?

Copper wire conducts electricity Physical Property Physical Property! It doesn’t change the copper wire to check conductivity. Physical Property Is it a Physical Property Chemical Property or a Chemical Property?

Alka Seltzer fizzes in water Chemical Property Chemical Property! It will change the Alka Seltzer to dissolve it in water. Physical Property Is it a Physical Property Chemical Property or a Chemical Property?

The density of gold is 19.3 g/mL Physical Property Physical Property! It won’t change the gold to calculate its density. Physical Property Is it a Physical Property Chemical Property or a Chemical Property?

Physical Change A change that alters the appearance of a material but doesn’t make that material into something new Examples: –Tearing Paper –Chopping Wood –Molding Clay –Cutting Hair –Mixing Salt and Pepper DOES NOT form a new substance

Chemical Change A change in matter that produces a new substance Examples: –Fireworks –Food rotting –Lighting a match

5 clues to a Chemical change 1.Color Change 2.Gas given off (bubbles) 3.Temperature Change (hot or cold) 4.Precipitate formed – two liquids form a solid 5.New substance formed

Physical or Chemical Change? Physical Change

Physical or chemical change? Hammering wood together Physical Change

Physical or chemical Change? Rusty Bike Chemical Change

Physical or Chemical change? Melting Butter Physical Change

Physical or chemical change? Rotting food Chemical Change

Physical or Chemical Change? Mixing Kool-Aid powder in water Physical Change

Physical or chemical change? Mowing the grass Physical Change

Physical or chemical change? Bleaching your hair Chemical Change

Physical or chemical change? Fireworks exploding Chemical Change

Physical or chemical change? Squeezing oranges to make orange juice Physical Change

Physical or chemical change? Frying an egg Chemical Change

Physical or chemical change? Burning leaves Chemical Change

Physical or chemical change? Cream being whipped Physical Change

Physical or chemical change? Burnt toast Chemical Change

Physical or chemical change? Melting Ice cream Physical Change