Do Now Silently, independently. You have 10 minutes Homework needs to be out on your desk for collection.

Class Averages Are Posted The class with the highest class average at the end of the unit will receive fresh doughnuts! There is a Quiz on Monday = Be prepared!!

Following Students Need to See Me after Class Charity Alex Niyah Dekario Levichiana

No Name Work is in the Back

Today’s objectives: SWBAT define pressure and gas pressure and identify factors that affect gas pressure. SWBAT explain Charle’s law, Boyle’s law and the combined gas law.

Gas Laws!

What Will Happen to the Balloon During Class? Do you predict that the volume of the balloon will increase, decrease, or stay the same after the balloon has been in a warm place? Write your prediction in today’s notes.

Today’s Vocabulary Pressure ◦Is the result of a force distributed over an area. Absolute Zero ◦0 K (Kelvin) Charle’s Law Boyle’s Law

Why might this be important to you? Self-Reflection Silently & independently Two scholars share Why this is exciting for me?

Factors that affect Pressure-Do Now Example An increase in temperature will increase the volume ◦They are DIRECTLY related, as one increases so does the other.

Factors that Affect Pressure Temperature Volume Number of Particles

Boyles Law As volume of a gas decreases the pressure increases IF temperature & particles This means they are INDIRECTLY related At a constant temperature, as pressure increases VOLUME decreases Equation: P1V1 = P2V2

Charles Law At a constant TEMPERATURE and NUMBER OF PARTICLES the volume of a gas is directly proportional So, as one increases so does the other. At a constant pressure as volume INCREASES, when temperature INCREASES Mathematical Equation: V1/T1 = V2/T2

Sample Problems Boyles Law: Volume: 9.66 mL Pressure 1: 64.4 kPa Pressure 2: 94.6 kPa New volume? Temperature as remained constant

Charles Law Volume 1: 200 L Volume L New Temperature? Constant Pressure

Combined Gas Law A combination of Boyle’s and Charles’s law. It describes the relationship between temperature, volume, and pressure of a gas when the number of particles is constant. P1V1/T1 = P2V2/T2 You will need to add this separately to your notes.

Assigned Partners! This will be your partner for the year. ALWAYS volume 1 Silently turn your desks and face each other. There will be a partner A and partner B. Partner A will usually begin. Today, start with introductions. So partner A begin with, “Hi my name is _____________ and my favorite food is ___________.” Then partner B will repeat.

Let’s have a group model.

Let’s Practice Again Put desks back and practice from the beginning. Transition should be done silently and swiftly. Partner A begin, the partner B. Introduce yourself again. “Hello, my name is _________ and my favorite super hero is ____________ because ________.” Partner B repeat.

Review of Units TemperaturePressureVolume VariableTPV UnitsK (Kelvin) To convert from Celsius add K Pa (pascal) or atm (atmospheres) 1 kPa = 1000 Pa M^3 = mL 1000 mL = 1 L

Class Calculators (Pass Out Procedure) Each group will receive one This means you have to work TOGETHER Pass Out is done silently, and work is done at a volume 1

Let’s Practice Work with your assigned partner Silent hands for questions. Steps for Success 1. identify the variables 2. identify and use correct gas equation 3. convert units as needed 4. ask you self if the answer is reasonable?