o Have your homework out & your lab notebook & your HW sheet! o Obtain a copy of the worksheet from the front lab station (1 per person) o Ask your partner, “ Was the Copper Lab that bad? Aren’t you glad we’re done?”

a. What causes pressure in a sample of air molecules? b. What could cause pressure in the sample to increase? c. What could cause pressure in the sample to decrease? Draw a small particle drawing for parts b, c

 I can predict and explain how the pressure of air changes when air speed changes (Bernoulli’s Principle)  I can collect and interpret data to determine the relationship between pressure and volume (Boyle’s Law)  I can determine the relationship between pressure, temperature, volume, and number of molecules in a sample of gas

 In your lab group, go over the homework  Team captain = person who went farthest from Maple Valley over Mid-Winter Break  I will solve any requested problems in a few minutes

The flow/speed of molecules changes gas pressure  As speed increases, pressure decreases  As speed decreases, pressure increases Why?  Increasing air speed aligns molecules  less collisions, LOWER pressure  Slower air is more chaotic  more collisions, HIGH pressure  Molecules like to flow from high  low Pressure

 What happens to the fluid in the tube when air travels over the tube?  How does the air move around the ball with the hoses?  How does the air move around the ball with the funnel?  What happens with the ball with you use the toy?  YOUR TURN! Make your bubble levitate!

Pressure TemperatureVolume Today!Next time! Time after next!!

 Obtain a 20 mL plastic syringe  Start the plunger at 20 mL. Cover the tip of the syringe firmly with your finger tip. Be sure to make a good seal.  Push the plunger until it reaches approximately 15 mL  Apply more pressure to the syringe so that the inside volume is 13 mL, then 10 mL, and so on 1. What did you experience when you push the plunger down from 20 mL to 15 mL and then from 15 to 10 mL? 2. Are you able to push the plunger all the way to the bottom? Explain why or why not. 3. Explain why the number of air molecules in the syringe doesn’t change but the volume does.

 Successful lab looks like:  On google documents (YAY SAVING TREES!)  Data table copied and filled in (with units!)  Copied graph of volume vs. pressure  Processing Data Questions 1-10 o Explanations in complete sentences o Values given with units

1. Use a syringe + a pressure sensor to determine the relationship between P and V 2. Get the following data. 3. Use this data, come up with a formula for the relationship between pressure and volume. Volume (in mL) Pressure ( in kPa) P/V= kP∙V = k

 Sensor set up  Pressure (on channel 1- scroll to the bottom) o Pressure sensor in kPa  1b on handout- set syringe to 10ml volume  Attach syringe to sensor and make sure blue valve is closed  In procedure: o Don’t do 2, 4, clicking keep/stop in 5, 8, 9  In processing questions: o Interpret your graph to answer these Volume (in mL) Pressure ( in kPa) P/V= kP∙V = k

Volume (in mL) Pressur e ( in kPa) P/V= kP∙V = k

 Draw a simple line graph showing the relationship between pressure and volume  Label the axes  Homework:  Finish the pHet online activity  Boyle’s Law (turn into Google Classroom 1 st thing next class)