Catalyst 1. What is the coldest possible temperature. What happens at this point? 2. You have a gas that has a pressure of 2 atm and a volume of 5 L. What.

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Presentation transcript:

Catalyst 1. What is the coldest possible temperature. What happens at this point? 2. You have a gas that has a pressure of 2 atm and a volume of 5 L. What is the new pressure if the gas is compressed to 2 L 3. How can you crush a can without touching it? End

Crushing a Can Without Touching It

Justify – TPS Using the concepts of pressure, temperature, and/or volume explain why the can was crushed without touching it.

LECTURE 5.3 – CHARLES AND GAY – LUSSAC’S LAW

Today’s Learning Targets LT 5.8 – I can explain Charles Law, how it relates to temperature and volume, and I can calculate temperature and volume values for a given problem LT 5.9 – I can explain Gay-Lussac’s Law, how it relates to temperature and pressure, and I can calculate temperature and pressure values for a given problem.

What does Gay – Lussac’s Law state?

I. Pressure and Temperature Relationship Gas molecules move quicker the more we heat them up. This means that they will be hitting the sides of the container more often. Therefore, the pressure will also increase as the temperature increases. If we keep volume constant, then pressure and temperature are directly related.

Gay-Lussac’s Law

This is an direct relationship! As one goes up the other goes up! Gay-Lussac’s Law Absolute Zero This is an direct relationship! As one goes up the other goes up!

Using what you Know now, Why did the Pop Can Get Crushed?

How do you calculate using Gay – Lussac’s Law?

Gay-Lussac’s Law Gay-Lussac’s Law relates pressure and temperature through the expression:

Class Example An aerosol can containing gas at 101 kPa and 22 oC is heated to 55 oC. Calculate the pressure in the heated can.

Summarize

Catalyst 1. What do Gay – Lussac’s and Boyle’s Law state 2. You have a gas that has a pressure of 2 atm and a volume of 50 K. What is the new pressure if the gas is heated to 400 K. End

Dry Ice and Balloons Obtain one balloon and a piece of dry ice. Put the dry ice in a large beaker of water. Place the balloon in a large tub and carefully pour the dry ice water over the balloon. There should be a substantial decrease in the size of the balloon. You may need to leave the balloon in the water in order for a full shrinking of the balloon to be observed.

Justify – TPS Why does the volume of the balloon decrease as the cold dry ice is poured over it?

What is Charles’s Law?

I. Volume and Temperature As you heat up gas molecules they move quicker and this causes them to hit the sides of the container with greater frequency. If the container is capable of expanding, then the volume will increase as the temperature increases.

Charles Law Graph This is a direct relationship!

How do you calculate using Charles’s Law?

I. Charles Law Charles Law can be described by the equation:

Class Example A gas is collected and found to fill 2.85 L at 25.0°C. What will be its volume at 273 K?

Summarize

Around the World

Exit Ticket A gas has a pressure of 0.370 atm at 20.0 °C. What is the pressure at 10 °C? A gas is known to react at 15 atm. If the gas begins at 5 atm and 20 L, then what must your final volume be?

Rate Yourself On LTs 5.1 – 5.9 rate yourself 1 – 4 based on your measured level of proficiency

Closing Time Homework 5.3 – Charles’s and Gay – Lussac’s Law Practice