Exothermic and Endothermic Reactions It’s a give and take relationship!!!!

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Presentation transcript:

Exothermic and Endothermic Reactions It’s a give and take relationship!!!!

Every Reaction Involves Energy 1.D uring a reaction…bonds absorb energy and break 2. N ew bonds form…energy released

Symbols In Chemical Reactions

Heat is given off Light Energy Electrical Energy Thermal Energy

What Is A Chemical Reaction? Chemical Reaction: the process by which one or more substances undergo change to produce one or more different substancesChemical Reaction: the process by which one or more substances undergo change to produce one or more different substances How To Identify A Chemical Reaction Has Occurred Or Is Happening 1. Gas Formation 3. Color Change 4. Energy Change 2. Solid Formation

Parts To A Chemical Reaction C O2O2O2O2 CO 2 1.Reactants: starting materials of a chemical reaction 2.Products: substances formed

Chemical Reaction 2 2Na Cl 2 2NaCl What Do You Notice About All The Atoms?

Chemical Reactions Must Be Balanced!!!! It’s a Law!!!!!!!!!!! The Law Of Conservation Of Mass **Mass is neither created nor destroyed in ordinary chemical reactions

Exothermic Reactions Chemical Reaction in which energy is released or removedChemical Reaction in which energy is released or removed 2 Na + Cl 2  2 NaCl + Energy Energy is in the products in an Exothermic Reaction

Endothermic Reactions Chemical reaction in which energy is absorbed 6 CO H 2 O + Energy  C 6 H 12 O Energy is in the reactants in an Endothermic Reaction