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.

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

↑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

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.)

PhET Findings: T vs. V Before ↑T ↑V

PhET Findings: T vs. V Before ↓T ↓V

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

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

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

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?

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?

Homework