Physical and Chemical Changes PHYSICAL CHANGE THE SUBSTANCE

Physical and Chemical Changes

PHYSICAL CHANGE THE SUBSTANCE CHANGES WHAT IT LOOKS LIKE; THE FORM OF THE SUBSTANCES CHANGES • CHANGE OF STATE (MELTING, FREEZING, SUBLIMATION, CONDENSATION, EVAPORATION) • DISSOLVING A SUBSTANCE (KOOL – AID) • BREAKING AN OBJECT (2 PIECES OF A PENCIL) • CUTTING A SUBSTANCE

CHEMICAL CHANGE THE SUBSTANCE CHANGES WHAT IT IS; A NEW SUBSTANCE IS FORMED • HEAT, LIGHT, ENERGY, GAS IS GIVEN OFF • BURNING SOMETHING • COOKING SOMETHING • ROTTING • SOURING • SPOILING • A PRECIPITATE (A SOLID) IS FORMED • COLOR CHANGE • RUST FORMS

REMEMBER… SOME THINGS THAT HINT A CHEMICAL CHANGE HAS TAKEN PLACE • HEAT OR LIGHT IS GIVEN OFF • BUBBLES OF GAS ARE GIVEN OFF • A PRECIPITATE IS FORMED • THE CHANGE IS DIFFICULT TO REVERSE

CHEMICAL OR PHYSICAL CHANGE? n n n n boiling water tearing clothes tarnishing silver lighting a match chewing food breaking a stick a rusting nail burning gas in a stove melting ice cream sawing wood oxidizing food for energy stretching a rubber band spoiled potato salad baking a cake

CHEMICAL OR PHYSICAL CHANGE? n n n n n SODIUM HYDROXIDE DISSOLVES IN WATER HCl REACTS WITH KCl TO PRODUCE A SALT, WATER, AND HEAT A PELLET OF SODIUM IS SLICED IN TWO ICE MELTS MACARONI SALAD SPOILS IN THE SUN WATER EVAPORATES COOKING BROWNIES A BALLOON IS FILLED WITH AIR THE BODY DIGESTING FOOD A CATERPILLAR TRANSFORMING INTO A BUTTERFLY