Presentation on theme: "Section 1 Forming New Substances"— Presentation transcript:
1 Section 1 Forming New Substances Chapter 14Section 1Forming New Substances
2 Chemical ReactionsChemical Reaction- one/+ things change to produce one/+ new things with new properties
3 Signs of Chemical Reactions Gas formationbubblesEnergy changeLight, heat, electricitySolid formationPrecipitate- solid in solutionColor changeBleach, leaves* These are not always present….sometimes they are not visible
4 Change in PropertiesSigns do not guarantee that a chemical reaction is happeningExample: boiling waterChange in properties is the only way to be sure that a chemical reaction has occurred!!
5 Breaking and Making Bonds Bonds of starting thing must breakMovement and energyAtoms rearrangeNew bonds form**new bonds= new properties