1. Science Starter (Week 12, Day 3, 4/21/16)
Why did the dye diffuse faster in the hot water than in the cold water in our demo Tuesday?
What is volume?
What is the name of MgO2? CCl4?
What do you know about “pressure”?
Temperature is a measure of ______________

2. Objective SWBAT perform simple gas unit conversions
SWBAT continue to explain how KMT works in the real world
SWBAT describe the relationship between pressure and temperature, volume, and number of particles.

3. Today’s Agenda Science Starter Recap Yesterday Gas Conversions
Gas Laws Lab
HW: Worksheet 6.1

4. Kinetic Molecular Theory
Review Of Yesterday
Solid vs. Liquid vs. Gas
Describe Particle Movement
Temperature effects
Kinetic Molecular Theory
Gas particle movement
Particle interaction
Heat

5. Review Cont.
Expansion and Contraction:
Matter heats up  Moves faster EXPANDS (Takes up more space)
Matter cools down Moves slower CONTRACTS (Takes up less space)
The hotter molecules get, the faster molecules move, the further apart they move from each other.

6. Unit 6: Gas Laws Pressure

7. Background Info:
PRESSURE – a force caused by the collisions between gas particles and the sides of their container

8. Gas Units kPa  kilopascals torr  Torr atm  atmospheres
Write these down!!!
kPa  kilopascals
Used frequently by meteorologists
torr  Torr
Named after the Italian scientist Evangelista Torricelli
atm  atmospheres
Sea level is 1 atm
mmHg  millimeters of Mercury
Hg is the atomic symbol for Mercury
psi  pounds per square inch
This is the what is usually used to measure the air pressure in a car tire!

9. WRITE THESE IN YOUR NOTES!!
How do they relate?
1 atm = 760 torr = kPa = 760 mmHg = 14.7 psi

10. Got it? Let’s use the values you just copied to convert!
DIMENSIONAL ANALYSIS!!! (Just like 1-step conversions!)
EXAMPLE: Convert 12 psi to torr.
Step 1 – Write out your units for a conversion
Step 2 – Fill in the numbers
THAT’S IT!

11. Still scratching your head?
Convert 2.2 atm to kPa.
Step 1 – Write out your units for a conversion
Step 2 – Fill in the numbers

12. You try! Convert 185 kPa to psi Convert 912 mmHg to atm
In your notebook, solve the following problems with someone around you.
Convert 185 kPa to psi
Convert 912 mmHg to atm
Convert 20.7 psi to torr
Convert 3.6 atm to kPa

13. Gas Laws Lab April 21, 2016
Intro
Purpose: to determine the relationship between pressure, volume, temperature and number of particles

14. Increasing temperature will ________ pressure.
Hypothesis:
Make a prediction for the following (increase/decrease/not affect)
Increasing temperature will ________ pressure.
Increasing volume will ______ pressure
Increasing number of particles will ______ pressure.

15. This is a 50 point Lab Assignment. DO IT AND EARN YOURSELF AN A!
Materials and Methods
Copy materials and methods at lab station into notebook
Data/analysis
Copy Questions and answer each question at the lab station
Be sure to draw a graph and label it properly as well (line graph)
This is a 50 point Lab Assignment. DO IT AND EARN YOURSELF AN A!

16. Lab Norms
You should not move on to the next station before I call time.
You should not be away from your station unless you ask to do so (being away from your bench will result in a poor grade)
I should not be able to hear your voice over anyone else’s at any time.
You choose your grade today. Do your work and earn a 100%. Personal responsibility is important.

17. Conclusion (answer these questions in complete sentences.)
Looking back at your hypothesis, were your predictions correct? Explain.
Explain (in terms of energy, particle motion, and collisions) how these relationships work
Pressure versus Temperature (Explain WHY pressure increases with increased temperature)
Pressure versus Volume
Pressure versus Number of Particles

18. Unit 6 Worksheet 1: Intro to KMT
Complete the worksheet for homework, it will be checked for completion at the beginning of class tomorrow