Bell Ringer (on Friday) Complete the half sheet and attach to your bell ringer sheet (glue at the front for Friday).

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Presentation transcript:

Bell Ringer (on Friday) Complete the half sheet and attach to your bell ringer sheet (glue at the front for Friday).

Acting!

Questions from WS?

Heating Curve Simulation ex.html ex.html

Heat Energy flows from something warm to something cool Energy flows from something warm to something cool A hotter substance gives energy to a cooler one A hotter substance gives energy to a cooler one When heat is transferred (lost or gained), there is a change in the energy within the substance When heat is transferred (lost or gained), there is a change in the energy within the substance

Heat Transfer ► We know heat flows from hot to cold… ► But, how is heat energy transferred? ► There are three ways in which energy is transferred. 1.Conduction 2.Convection 3.Radiation

How does heat flow through materials? ► CONDUCTION ► Transfer of thermal energy arising from temperature difference between adjacent parts of a solid body (through direct contact). For heat transfer to take place there must be a temperature difference. Gasses are poor conductors of heat – due to molecules so far apart (no contact of molecules) Metals have the greatest potential to conduct heat.

Conduction, Convection, Radiation Solids, liquids, gases  who conducts heat the best and why? Solids- particles are closer together

Other ways that heat moves… ► Convection ► This is the transfer of heat energy by movement of a fluid (liquid or gas). ► This higher the temp. the more the molecules expand ( more energy); therefore, it is less dense and rises. The cooler temp. fluid replaces the space and will then become heated. The result is circulation.

Convection Currents

► An Eagle will save a lot of Energy by soaring on the convection currents that occur with the heating of our atmosphere.

Conduction, Convection, Radiation Convection-

Radiation Radiation – transfer of energy by electromagnetic waves Electromagnetic waves – can travel without matter being present. Waves carry ENERGY until they collide with another particle.

Radiation Radiation – can be absorbed, reflected, or transmitted Depends on type of material Dark t-shirt: absorb radiant energy Glass door in microwave: reflects radiation Sun: transmits radiation

Conduction, Convection, Radiation Radiation

Temperature Kelvin = o C Celsius K = o C o C = K – Standard temperature = 273K

Pressure Amount of force that is applied over an area (p = F/A) Measured in Pascals (Pa) Other units of measurement: atmospheres (atm), kilopascals (kPa), torr (Torr), millimeters of mercury (mmHg), bars (b) Standard Pressure 1 atm 1 atm = kPa = 760 Torr = 760 mmHg = b = 14 psi

Bring empty aluminum can Monday – soda can!

Phase Change Diagrams Objectives: 1. Determine the location of all the terms in your baggie on the blank phase change diagram. Use the provided definitions as guidance. 2. Identify the diagram as either H 2 O or CO 2 based on given data. 3. Compare your phase change diagram with another group (with a different compound). 4. Transfer the information to your notes. Product: Checked phase change diagram and complete notes (with definitions) on phase change diagram When complete, work on exit ticket then on HW.

Phase Diagram ► A phase diagram shows what phase a substance will be in at a certain temperature and pressure. Pressure is measured in atmospheres (atm).

Phase Diagram ► Triple Point – is the point on a phase diagram that shows the temperature and pressure combination at which three phases of a substance can coexist.

Phase Diagram ► Critical Point – is the temperature and pressure combination above which a vapor cannot be liquefied under any circumstances.

► Compare the phase diagram of water and CO 2. The solid- liquid line for water has a negative slope. The solid-liquid line for CO 2 has a positive slope. What does that mean???

12. Point “O” on the above diagram represents a temperature and pressure when all three phases exist in equilibrium. What is the point called? 13. At which point do the solid and liquid phases exist at equilibrium? 14. At which point would a boiling liquid form? 15. At which point would sublimation occur? 16. What is the name of the highest temperature at which it is possible to liquefy a gas with any amount of pressure? 17. What is the critical pressure of water? 8. What is the critical temperature of CO 2 ?

Exit Ticket Complete the half sheet related to phase diagrams Bring empty aluminum can Monday – soda can!