Wed/Thurs April Objective: Explain what changes in temperature can do to pressure. Checkpoint: Convert the following temperatures: 1)25⁰C  K 2)38⁰C  K 3)10⁰C  K 4)-15⁰C  K 5)300 K  ⁰C 6)285 K  ⁰C 7)100 K  ⁰C 8)What temperature in Fahrenheit are the above temperatures? You may use an online converter. Homework: finish group PPT if necessary

1)25⁰C  K 2)38⁰C  K 3)10⁰C  K 4)-15⁰C  K 5)300 K  ⁰C 6)285 K  ⁰C 7)100 K  ⁰C = 298 K = 311 K = 283 K = 258 K = 12⁰C = 27⁰C = -173⁰C 77 ⁰F 100 ⁰F 50 ⁰F 5 ⁰F 80 ⁰F 54 ⁰F -279 ⁰F

Stoichiometry Exam Re-take up to a 16.5 (until next Friday) A20-22 B18-19 C15-17 D13-14 F0-12

Temperature = molecular motion (average kinetic energy of molecules) Volume = amount of space something takes up Pressure = what you feel when something smacks against you

Units of pressure

751 torr  mm Hg 751 torr x torr mm Hg = mm Hg

0.95 atm  kPa 0.95 atm x atm kPa = kPa

635 mm Hg  atm 635 mmHg x mm Hg atm = atm

150 kPa  atm 150 kPa x kPa atm = atm

1.2 atm  torr 1.2 atm x atm torr = torr

Molecular motion of gases Air pressure is caused by getting hit by air molecules. Why can’t you feel the air pressure?

Atmospheric pressure can collapse much bigger containers too!

What is pressure? Think of a definition of pressure. Share your definition with your partner.

Pressure demo I need one volunteer who doesn’t mind me standing on their stomach.

Pressure = the pushing force of an object against another object. Pressure = force area

Pressure = the pushing force of an object against another object. Pressure = force area

Least amount of pressure? small large

Most amount of pressure? large small

Pressure! From water… What would happen to an unprotected person at the bottom of the ocean?

Pressure! From water… The water pressure is very high. The pressure from the water would push in on the person’s body, causing any space that’s filled with air to collapse. (The air would be compressed.) So, the lungs would collapse. Part of the problem with the old pressure suits that deep-sea divers used to use was that if they depressurized, the soft part of the suit and the entire body would be crushed into the rigid helmet. This is one of the big reasons that divers don’t use suits like this anymore.)

Mountain View Atmospheric pressure

What is one gift you have received that you will never forget?

Balloon and a flask Read task card: Follow directions on card regarding the activity. Create a PPT presentation that explains what happened with the balloon.