CHEMICAL REACTIONS HOW MATTER CAN CHANGE

What is a Chemical Reaction? A Chemical Reaction is a combination of two or more elements bonded together to make a new substance. A Chemical Reaction is a combination of two or more elements bonded together to make a new substance. Ex. Na + Cl = NaCl or Table Salt Ex. Na + Cl = NaCl or Table Salt + = + =

EVIDENCE OF CHEMICAL REACTIONS PRODUCTION OF A GAS PRODUCTION OF A GAS Slo Mo Liquid Explosion Redux Video Slo Mo Liquid Explosion Redux Video Slo Mo Liquid Explosion Redux Video Slo Mo Liquid Explosion Redux Video

EVIDENCE OF CHEMICAL REACTIONS CHANGE OF COLOR CHANGE OF COLOR BLEACH/FOOD COLORING BLEACH/FOOD COLORING SODIUM HYDROXIDE AND PHENOLPHTHALEIN SOLUTION SODIUM HYDROXIDE AND PHENOLPHTHALEIN SOLUTION DYED HAIR, BLEACHED JEANS DYED HAIR, BLEACHED JEANS CUT APPLE TURNS BROWN – WHY? CUT APPLE TURNS BROWN – WHY?

EVIDENCE OF OF CHEMICAL REACTIONS CHANGE IN ENERGY (heat or light) CHANGE IN ENERGY (heat or light) ENERGY MUST BE ADDED TO BREAK BONDS ENERGY MUST BE ADDED TO BREAK BONDS ENERGY IS RELEASED WHEN NEW BONDS ARE MADE ENERGY IS RELEASED WHEN NEW BONDS ARE MADE

EVIDENCE OF CHEMICAL REACTIONS ODOR ODOR GAS IS FORMED BUT YOU CANNOT SEE IT ONLY SMELL IT. GAS IS FORMED BUT YOU CANNOT SEE IT ONLY SMELL IT. PRECIPITATE IS FORMED PRECIPITATE IS FORMED SUBSTANCE FORMS ON TOP OF A SOLUTION SUBSTANCE FORMS ON TOP OF A SOLUTION

Examples of Chemical Reactions FIRE/EXPLOSIONS FIRE/EXPLOSIONS FIREWORKS FIREWORKS MAKING SALT MAKING SALT STOMACH DIGESTING FOOD STOMACH DIGESTING FOOD FIRE EXTINGUISHER FIRE EXTINGUISHER METAL RUSTING METAL RUSTING

EXOTHERMIC REACTIONS RELEASE ENERGY RELEASE ENERGY TEMPERATURE OF SURROUNDINGS INCREASE DUE TO RELEASE FROM CHEMICAL REACTION TEMPERATURE OF SURROUNDINGS INCREASE DUE TO RELEASE FROM CHEMICAL REACTION

ENDOTHERMIC REACTIONS ABSORB ENERGY TO BREAK THE BONDS; DON’T PRODUCE AS MUCH IN FORMING NEW BONDS ABSORB ENERGY TO BREAK THE BONDS; DON’T PRODUCE AS MUCH IN FORMING NEW BONDS