Chemistry: Changing Matter
Lesson 1 What are Physical and Chemical Changes? Matter changes all the time: Physical Change: matter keeps the same chemical properties Chemical Change: matter changes into a different kind of matter with different properties
Physical Changes The substance does not change into something else Changes in: Size Shape Volume State of matter
Physical Change Examples Rain to sleet Wood to sawdust Paper to shredded paper Wax to melted wax Potato to grated potato Gemstone to carved gemstone Copper to hammered copper
Chemical Changes 1 kind of matter changes into a different kind of matter with different properties Example: Cooking foods cause them to go through a chemical change Egg vs. cooked egg
Chemical Changes (cont.) Causes atoms to rearrange themselves to form new kinds of matter Clues that chemical changes have occurred: Heat Light Iron = gray Sound Fizzing Rust = reddish orange Color
Chemical Changes Examples Burning of a candle in an oxygen atmosphere Changes to ash Carbon dioxide Water vapor
Chemical or Physical Change?