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Boyles Law
Relate to Charles’ Law LabRelate to Charles’ Law Lab
Introduction Introduction
LabLab
Exit TicketExit Ticket
Graph of Charles’ Law Lab relating Temperature and Volume
http://www.grc.nasa.gov/WWW/K-12/airplane/glussac.html
2. Proportionality
• Inversely proportional relationship means Inversely proportional relationship means as one variable increase the other as one variable increase the other decreases. decreases.
• Proportional relationship means that as one Proportional relationship means that as one variable increases the other variable increases the other increases. increases.
3. Does the graph of Charles’ Law show an inversely proportional or
(directly) proportional relationship?
• Proportional, Why?Proportional, Why?• As temperature increases, volume also As temperature increases, volume also
increases increases • As temperature decreases, volume also As temperature decreases, volume also
decreasesdecreases
4. According to the Kinetic Molecular Theory of Gases, the
actual volume occupied by a gas is extremely small compared to the
volume it occupies?
• Real World: Yes, the actual gas molecule is Real World: Yes, the actual gas molecule is extremely small as compared to the volume extremely small as compared to the volume it occupies, but it does occupy a volume. it occupies, but it does occupy a volume.
• Calculation: Individual molecules are very Calculation: Individual molecules are very small and negligible to the calculation.small and negligible to the calculation.
Compressibility
• This is a crowding effect of gases when the This is a crowding effect of gases when the volume is decreasedvolume is decreased
Pressure • Pressure is not the same as force. Pressure is not the same as force.
• Pressure is a force over an area. Pressure is a force over an area.
• Example: psi = Pounds per inExample: psi = Pounds per in22
Photograph by : Larry MacDougal/CanWest News Service
http://hypertextbook.com/physics/thermal/pressure-temperature/
Measuring Pressure
• A A barometerbarometer measures measures atmospheric atmospheric pressure. pressure.
www.aniscon.com/&h=300&w=315&sz=59&hl=en&start=17&um=1&tbnid=U44eZ-VI6n9D3M:&tbnh=111&tbnw=117&prev=/images%3Fq%3DBarometer%26um%3D1%26hl%3Den%26rlz%3D1T4DKUS_enUS213US214%26sa%3DN
Units of Pressure
• Kilopascals (Kilopascals (kPakPa),),• Atomospheres (Atomospheres (atmatm),),• Millimeters of Millimeters of
mercury (mercury (mm of Hgmm of Hg), ), • Torr (Torr (torrtorr))
• Helpful ConversionsHelpful Conversions• 1 atm = 1 atm = 760 760 mm Hgmm Hg• 1 atm = 1 atm = 760 760 torrtorr• 1 mm Hg = 1 mm Hg = 11 torr torr• 1 atm = 1 atm = 101.325101.325 kPa kPa
Volume
• Liters (Liters (LL),),• Milliliters (Milliliters (mLmL),),• Centimeters (Centimeters (cmcm33))
• Helpful conversions Helpful conversions – 1000 mL = 1000 mL = 11 L L
– 1 mL = 1 mL = 11 cm cm33
Boyle’s Law:
• PressurePressure and and volumevolume are inversely are inversely proportional proportional
• Formula: PFormula: P11VV11 = P = P22VV22
Boyle’s Law
http://www.grc.nasa.gov/WWW/K-12/airplane/boyle.html
Lab Overview
1.1. Pressure = Books of Uniform MassPressure = Books of Uniform Mass
2.2. Find the Average Volume for Each MassFind the Average Volume for Each Mass
3.3. Graph the Average Volume vs. Pressure Graph the Average Volume vs. Pressure
4.4. Exit Ticket Exit Ticket
Lab Parts
Draw up 35 mL (or cc) in
syringe and cap it—notice we will read the measurement
from the bottom of the plunger. What about sig
figs?
Be sure to put the cap in the bottom. Some kits have black caps and some
have orange caps.
Slide the other end of the syringe into the wooden platform.
The uniform masses are textbooks.
• You will add one book You will add one book at a time.at a time.
• Record the volume Record the volume (correct sig figs) after (correct sig figs) after each book is added.each book is added.
• When you have all 6 When you have all 6 books on the books on the apparatus, you will apparatus, you will then remove one book then remove one book at a time and record at a time and record the volume after each the volume after each book is removed.book is removed.
Lab Safety
• GogglesGoggles
• Lab ApronLab Apron
• Common Sense! Common Sense!
QUESTIONS??