Warm-up 1) If I increase the temperature of a gas, what happens to it’s kinetic energy? 2) Would the smell of perfume moving across a room be an example.

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Presentation transcript:

Warm-up 1) If I increase the temperature of a gas, what happens to it’s kinetic energy? 2) Would the smell of perfume moving across a room be an example of diffusion or effusion?

Boyle’s Law

Boyle’s Law: Pressure-Volume Created by Robert Boyle Created by Robert Boyle Deals with changes in pressure and volume (temperature kept constant) Deals with changes in pressure and volume (temperature kept constant) As one increases, the other decreases (inverse relationship) As one increases, the other decreases (inverse relationship)

Formula Boyle’s law can be used to compare changing conditions Boyle’s law can be used to compare changing conditions P 1 and V 1 = initial conditions P 1 and V 1 = initial conditions P 2 and V 2 = final conditions P 2 and V 2 = final conditions P 1 V 1 = P 2 V 2 P 1 V 1 = P 2 V 2

Formula Figure out what your givens are first Figure out what your givens are first Write your formula Write your formula Plug in the values and solve for the unknown Plug in the values and solve for the unknown Make sure to write your units!!! Make sure to write your units!!!

Example V 1 = 150 mLP 1 = atm V 1 = 150 mLP 1 = atm V 2 = ???P 2 = atm V 2 = ???P 2 = atm P 1 V 1 = P 2 V 2 P 1 V 1 = P 2 V 2 (0.947 atm)*(150 mL) = (0.987 atm)*V 2 (0.947 atm)*(150 mL) = (0.987 atm)*V 2 V 2 = 144 mL V 2 = 144 mL

Example A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure be? A gas has a pressure of 1.26 atm and occupies a volume of 7.40 L. If the gas is compressed to a volume of 2.93 L, what will its pressure be? P 1 = 1.26 atm P 1 = 1.26 atm V 1 = 7.40 L V 1 = 7.40 L P 2 = ??? P 2 = ??? V 2 = 2.93 L V 2 = 2.93 L

Example Cont. P 1 V 1 = P 2 V 2 P 1 V 1 = P 2 V 2 (1.26 atm)*(7.40 L) = P 2 *(2.93 L) (1.26 atm)*(7.40 L) = P 2 *(2.93 L) P 2 = 3.18 atm P 2 = 3.18 atm

Quiz 1. What creates the longest waves in the electromagnetic spectrum? 1. What creates the longest waves in the electromagnetic spectrum? 2. What creates the shortest waves in the electromagnetic spectrum? 2. What creates the shortest waves in the electromagnetic spectrum? 3. What is an example of something that gives off ultraviolet radiation? 3. What is an example of something 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 light? 5. What is the wavelength of visible light?