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

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

http://www.harcourtschool.com/activity/hotplate/index.html

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

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

TemperatureKelvin = oC Celsius + 273.15

K = oC + 273.15

oC = K – 273.15

Standard temperature = 273K

PressureAmount 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 = 101.3 kPa = 760 Torr = 760 mmHg = 1.01325 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 H2O or CO2

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 CO2. The solid-liquid line for water has a negative slope. The solid-liquid line for CO2 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 CO2?

Exit TicketComplete the half sheet related to phase diagrams

Bring empty aluminum can

Monday – soda can!