REVIEW TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY What type of energy is the spinning plate inside of a microwave.

Do Now-YOU HAVE 10 minutes. Work Quickly!

REVIEW TIME!What type of energy cooks food in a microwave oven?ELECTROMAGNETIC ENERGY

What type of energy is the spinning plate inside of a microwave oven?MECHANICAL ENERGY

What type of Energy?

Kinetic + Potential!(Mechanical energy)QUIZ TIME!Electrical energy is transported to your house through power lines.

When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy?

MECHANICAL ENERGY

QUIZ TIME!What energy transformation occurs when an electric lamp is turned on?

ELECTRICAL ENERGYELECTROMAGNETIC ENERGY(Light energy)

Energy Transfer

ChemicalElectricalElectricalElectricalSound(mechanical)Light(Electromagnetic)ThermalMechanical

Do Now-YOU HAVE 10 minutes. Work Quickly!Get with your group.Complete your group worksheet.Practice your presentation ATLEAST once.Designate one person in your group to hold up the appropriate types of energy cards at the end of the presentation.

Make this OSCAR-worthy!!

And the Oscar goes toTake a piece of scrap paper and rip it into 3 parts

On one piece, nominate someone for BEST ACTOR

On another piece, nominate someone for BEST SUPPORTING ACTOR

On the last piece, nominate a BEST MOVIE (list the scenario you enjoyed seeing played out the best)ThermochemistryThe study of heat change in chemical reactions.

Heat Change in Chemical ReactionsFor a chemical reaction to occur, bonds must be both formed and brokenFe + CuSO4 Cu + FeSO4

Energy is needed to break bonds.Energy is released when bonds are formed.9Exothermic process is any process that gives off heat transfers thermal energy from the system to the surroundings. Endothermic process is any process in which heat has to be supplied to the system from the surroundings. 2H2 (g) + O2 (g) 2H2O (l) + energyH2O (g) H2O (l) + energyenergy + 2HgO (s) 2Hg (l) + O2 (g)6.2energy + H2O (s) H2O (l)

11Thermochemical Equations4Fe (s) + 3O2 (g) 2Fe2O3 (s) + 1625 kJ

Does this reaction give off heat or absorb heat?

Exothermic or endothermic?

Thermochemical EquationsC (s) + 2S (s) + 89.3 kJ CS2 (l)

Is heat released or absorbed in this chemical reaction?

Exothermic or endothermic?

Enthalpy (H) is used to measure the heat flow into or out of a system in a process that occurs at constant pressure.

DH = H (products) H (reactants)Hproducts < HreactantsDH < 0Hproducts > HreactantsDH > 06.3Enthalpy(heat flow) is measured in:Joules (J)Kilojoules (kJ)1 kJ = 1000 Joules

Energy Level DiagramsEndothermic reactionsenergytime of reactionenergy taken in is positive, H is positivereactantsproductsThe products are higher in energy than the reactants16Energy Level DiagramsExothermic reactionsenergyTime of reactionreactantsproductsEnergy given outis negative; H is negative The products are lower in energy than the reactants17Endothermic or Exothermic?

Endothermic or Exothermic?

DH = H (products) H (reactants)What does DH equal?80kJ-160kJ = -80kJEndothermic or Exothermic?DH = H (products) H (reactants)

What does DH equal?Endothermic or Exothermic?

DH = H (products) H (reactants)What does DH equal?Endothermic or Exothermic?DH = H (products) H (reactants)

What does DH equal?Endo!Exo!Endothermic or Exothermic?

Consider this reaction:2C2H6 + 7O2 4CO2 + 6H2O + 3120 kJ

a. endothermic or exothermic?

b. If 28 moles of oxygen are reacted, how much energy will be produced?

exothermic3,120 x 4 = 12, 480 kJ