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 ______________

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.

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

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

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.

Unit 6: Gas Laws Pressure

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

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!

WRITE THESE IN YOUR NOTES!! How do they relate? 1 atm = 760 torr = 101.325 kPa = 760 mmHg = 14.7 psi

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!

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

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

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

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.

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!

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.

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

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