Warm-upWarm-up

1)1) If I increase the temperature of If I increase the temperature of a gas, what happens to it’s a gas, what happens to it’s kinetic energy?kinetic energy?

2)2) Would the smell of perfume Would the smell of perfume moving across a room be an moving across a room be an example of diffusion or example of diffusion or effusion?effusion?

Boyle’s LawBoyle’s Law

Boyle’s Law: Pressure-Boyle’s Law: Pressure-VolumeVolume

Created by Robert BoyleCreated by Robert Boyle Deals with changes in pressure Deals with changes in pressure

and volume (temperature kept and volume (temperature kept constant)constant)

As one increases, the other As one increases, the other decreases (inverse relationship)decreases (inverse relationship)

FormulaFormula

Boyle’s law can be used to Boyle’s law can be used to compare changing conditionscompare changing conditions

PP11 and V and V11 = initial conditions = initial conditionsPP22 and V and V22 = final conditions = final conditions

PP11VV11 = P = P22VV22

FormulaFormula

Figure out what your givens are firstFigure out what your givens are first Write your formulaWrite your formula Plug in the values and solve for the Plug in the values and solve for the

unknownunknown

Make sure to write your units!!!Make sure to write your units!!!

ExampleExample

VV11 = 150 mL = 150 mL PP11 = 0.947 atm = 0.947 atm VV22 = ??? = ??? PP22 = 0.987 atm = 0.987 atm

PP11VV11 = P = P22VV22

(0.947 atm)*(150 mL) = (0.987 atm)*V(0.947 atm)*(150 mL) = (0.987 atm)*V22

VV22 = 144 mL = 144 mL

ExampleExample

A gas has a pressure of 1.26 atm and A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the occupies a volume of 7.40 L. If the gas is compressed to a volume of gas is compressed to a volume of 2.93 L, what will its pressure be?2.93 L, what will its pressure be?

PP11 = 1.26 atm = 1.26 atm VV11 = 7.40 L = 7.40 L PP22 = ??? = ??? VV22 = 2.93 L = 2.93 L

Example Cont.Example Cont.

PP11VV11 = P = P22VV22

(1.26 atm)*(7.40 L) = P(1.26 atm)*(7.40 L) = P22*(2.93 L)*(2.93 L) PP22 = 3.18 atm = 3.18 atm

QuizQuiz

1. What creates the longest waves in 1. What creates the longest waves in the electromagnetic spectrum?the electromagnetic spectrum?

2. What creates the shortest waves in 2. What creates the shortest waves in the electromagnetic spectrum?the electromagnetic spectrum?

3. What is an example of something 3. What is an example of something that gives off ultraviolet radiation?that gives off ultraviolet radiation?

4. What is the speed of light?4. What is the speed of light? 5. What is the wavelength of visible 5. What is the wavelength of visible

light?light?