Energy 11/14 Read 53-61 Pink packet: Heat and its Measurement –Do numbers 1-3 SHOW ALL WORK Do now: What is the required amount of energy to start a.

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Presentation transcript:

Energy

11/14 Read Pink packet: Heat and its Measurement –Do numbers 1-3 SHOW ALL WORK Do now: What is the required amount of energy to start a reaction called? Name 2 types of energy that you encounter throughout the day.

Energy Capacity to do work SI unit of energy joule 2 Classes of Energy 1.Kinetic 2.Potential F:\chemistry\chemistry\energy\08_02EnergyConce pts_A.html

What are the 8 forms of Energy? 1.Chemical energy associated with changes 2.Mechanical When motion is produced by an exerting force 3.Electromagnetic Produced from light waves 4.Sound sound waves 5.Magnetic energy that is around a magnet and stored 6.Heat form of energy produced by molecules in motion 7.electrical Flow of charged particles through wiring 8.Light can be natural or created from electrical energy Applying_the_Concepts_of_Energy.asf

Revisited: Energy and Chemical Reactions What is a chemical reaction? An action that produces a chemical change What are 2 parts of a reaction? What are the 2 types of reactions? 1.Endothemic (requires and input of energy) 2.Exothermic (release of energy) What is Activation Energy? Minimum required amount of energy to start the reaction/ combustion energy\08_15HowEnzymesWork_A.html

LE 8-6b Reactants Energy Products Progress of the reaction Amount of energy required (  G > 0) Free energy Endergonic reaction: energy required

LE 8-6a Reactants Energy Products Progress of the reaction Amount of energy released (  G < 0) Free energy Exergonic reaction: energy released

Applying_the_Concepts_of_Energy.asf What_Is_Heat_.asf Heat_Transfer.asf

Conservation of Energy Energy is not created it is just converted or changed to a different form Law of conservation of Energy Albert Einstein’s Theory of Relativity If a system or body gives off energy it decreases in mass If there is an absorption of energy there is an increase in mass

Heat is transferred to different materials at different rates. specific heat capacity (C): determines the rate at which heat will be absorbed. specific heat capacity: water = 4.18J/g find heat absorbed (Q) by: Q=mC  T m=mass  T=change in temperature

Practice Problem A 2000 g mass of water in a calorimeter has its temperature raised by 3.0 deg C while an exothermic chemical reaction is taking place. How much heat is transferred to the water by the heat of reaction?

Regents Question: 06/02 #16 Which change in the temperature of a 1-gram sample of water would cause the greatest increase in the average kinetic energy of its molecules? (1) 1°C to 10°C (3) 50°C to 60°C (2) 10°C to 1°C(4) 60°C to 50°C

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