1. Closing assessment ten minutes after the bell.
Warm-Up 1/21/14: Grab a clicker and answer:
1)What happens to the pressure of a gas as the volume goes up?
a) Pressure increases b) Pressure decreases
2)What happens to the pressure of a gas as the volume goes down?
3)Nitrous oxide (N2O) is better known as laughing gas. If the pressure of 2.50 L of N2O changes from 105 kPa to 40.5 kPa, what will the new volume be?
(round to 3 s.f.)
Closing assessment ten minutes after the bell.

2. Objective
-Understand the relationship between temperature and volume of gases (Charles’ Law)
Agenda
-Review Boyle’s Law
-Charles’ Law

3. ↑V ↓P ↓V ↑P As volume increases, what happens to pressure?
Review Warm-Up
As volume increases, what happens to pressure?
↑V ↓P
As volume decreases, what happens to pressure?
↓V ↑P

4. Review Warm-Up
Nitrous oxide (N2O) is better known as laughing gas. If the pressure of 2.50 L of N2O changes from 105 kPa to 40.5 kPa, what will the new volume be? (round to 3 s.f.)

5. PhET Findings: T vs. V
Before
↑T ↑V

6. PhET Findings: T vs. V
Before
↓T ↓V

7. PhET Findings: T vs. V
↑T ↑V
↓T ↓V
Charles’ Law

8. Charles’ Law
Used to find a change in volume from a change in temperature or vice versa.
Soda Can Demo

9. Charles’ Law
A 600 mL sample of nitrogen is heated from 300K to 350K at constant pressure. What is the final volume?

10. Charles’ Law: You Try
A 4.40 L sample of a gas is collected at 323K. What will be its volume upon cooling to 298K?

11. Exit Ticket
A 5.00 L sample of a gas is collected at 100K and then allowed to expand to 20.0 L. What is the new temperature  in order to maintain the same pressure?

12. Homework