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!!
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.
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.
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
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 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 UnitsTemperature Pressure Volume
Variable T P V
Units K (Kelvin)
To convert from Celsius add 273.15 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