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Final Jeopardy Question
Gas Law Concepts Gas Law Problems Gas Law Demos Misc. Gas Laws STP & Temp. Problems 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Final Jeopardy Question
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Category 1 500 pts If temperature is doubled and volume is cut in half, what happens to the pressure? Back
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Pressure is 4 times the original
Category 1 500 pts Answer Pressure is 4 times the original Back
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Category 1 400 pts At constant temperature, if pressure is quadrupled, what happens to volume? Back
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Category 1 400 pts Answer Back
At constant temperature, if the pressure is quadrupled, what happens to volume? Pressure – 4x, then Volume – 1/4x Back
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What relationship does John’s Law demonstrate?
Category 1 300 pts What relationship does John’s Law demonstrate? Back
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Direct relationship between pressure and temperature
Category 1 300 pts Answer Direct relationship between pressure and temperature P1 = P2 T1 T2 Back
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Which gas law can be represented by the following graph?
Category 1 200 pts Which gas law can be represented by the following graph? Back
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Boyle’s Law – inverse relationship
Category 1 200 pts Answer Boyle’s Law – inverse relationship Back
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What does Charles’ Law state?
Category 1 100 pts What does Charles’ Law state? Back
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Catergory 1 100 pts Answer At constant pressure, direct relationship between volume and temperature Back
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Category 2 500 pts A sample of gas has a volume of 23 mL at 39oC and 890 mm Hg. This sample is cooled down to 11oC and now has a volume of 150 mL. What is the new pressure? Back
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Category 2 500 pts Answer Back
Use the combined gas law since all variables are changing… P1V1 = P2V2 T1 T2 890 mm Hg ( 23 mL) = P2 (150 mL) 312 K K P2 = mm Hg Back
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Category 2 400 pts A 50 L container is filled with a gas to a pressure of 4.7 atm at 32oC. At what temperature IN DEGREES CELSIUS will the pressure inside the container be 3.5 atm with a volume of 50 L? Back
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Category 2 400 pts Answer Volume is constant, so use John’s law.
P1 = P atm = 3.5 atm T1 T K T2 T2 = K – 273 = oC Back
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Category 2 300 pts A gas occupies a volume of 34 mL at
21.8 oC. To what temperature (in Kelvin) must the gas be raised to have a volume of 86 mL? Assume constant pressure. Back
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Category 2 300 pts Answer Pressure is constant, so use Charles’ law.
V1 = V2 34 mL = 86 mL T1 T K T2 T2 = K Back
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Category 2 200 pts A balloon has a volume of 6L at 2 atm. If the balloon was brought to a pressure of 4 atm, what would the new volume be (assume constant temp). Back
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Category 2 200 pts Answer Temp is constant, so use Boyle’s law.
P1V1 = P2V2 2 atm (6L) = 4 atm (V2) V2 = 3 L Back
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Category 2 100 pts Whose law is being used in the following situation…
A sample of gas in a flexible container occupies 46.5 mL at standard pressure. What volume will it take up if the pressure was increased to 3 atm? Assume constant temp. Back
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Catergory 2 100 pts Answer Temp is held constant, so it is Boyle’s law. Pressure increases while the volume decreases. Back
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At STP, how many liters of space will 8 g of O2 occupy?
Category 3 500 pts At STP, how many liters of space will 8 g of O2 occupy? Back
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Category 3 500 pts Answer Back 8 g O2 x 1 mole O2 x 22.4 L O2 =
g O mole O L Back
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Category 3 400 pts What is the Kelvin value for absolute zero, and what theoretically happens at this temperature? Back
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Category 3 400 pts Answer ZERO Kelvin (0K) and in theory all matter will stop moving at this temperature. Back
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Category 3 300 pts What is 550K in oC? Back
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Category 3 300 pts Answer 277 oC K = 273 + oC oC = K - 273
Back
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Category 3 200 pts What is 38.5 oC in Kelvin? Back
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Category 3 200 pts Answer 311.5 K K = oC Back
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What are the four values for Standard Pressure?
Category 3 100 pts What are the four values for Standard Pressure? Back
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Catergory 3 100 pts Answer 101.3 kPa = 760 torr = 760 mm Hg = 1 atm
Back
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Explain how a straw works – and DO NOT USE THE WORD “SUCK”.
Category 4 500 pts Explain how a straw works – and DO NOT USE THE WORD “SUCK”. Back
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Category 4 500 pts Answer Back
When you inhale, your lungs expand (Volume increases), creating less pressure in the straw or your mouth. Since the pressure in the straw is less than the pressure outside the straw, the atmospheric pressure PUSHES the liquid into the straw so you can enjoy it! Back
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Explain the egg in flask demo. AND REMEMBER SCIENCE NEVER ____!
Category 4 400 pts Explain the egg in flask demo. AND REMEMBER SCIENCE NEVER ____! Back
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Category 4 400 pts Answer Back
In the egg demo, water was heated in the flask. Since temp increased in the flask, the pressure also increased. The flask was then taken away from the heat, and an egg was placed on top. The flask cools down which causes the pressure inside the flask to decrease. Since the pressure inside the flask decreased, the atmospheric pressure outside the flask was greater; therefore, it PUSHED the egg into the flask. Back
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Category 4 300 pts A pressure apparatus that contains a sample of gas at a fixed volume is first placed into a container of hot water. It is then plunged into a container of liquid nitrogen (very cold). What happens to the pressure and why? Back
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Category 4 300 pts Answer This is an example of John’s law – when temp goes down, pressure goes down. Back
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Category 4 200 pts Explain why the Ivory soap expanded in the microwave and which gas law applies to this situation. Back
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Since temp increased, so does volume. This is Charles’ law.
Category 4 200 pts Answer Since temp increased, so does volume. This is Charles’ law. Back
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Category 4 100 pts What will happen to the volume of a balloon if it is placed into a bell jar (vacuum pump) and the pump is turned on. Back
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Catergory 4 100 pts Answer The volume of the balloon will increase. This is Boyle’s law… as P decreases, V increases and vice versa. Back
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Category 5 500 pts At what pressure would mole of nitrogen gas at 23.0 °C occupy 8.90 L? Back
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Category 5 500 pts Answer PV = nRT (Ideal Gas Law) P = nRT V
P = .15 mol x 8.31 L*kPa x 296 K ____ mol K______ 8.9L P =41.46 kPa Back
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Category 5 400 pts How many moles of oxygen gas are contained in a mL container at 21.0 °C and 90.3 kPa? Back
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Category 5 400 pts Answer PV = nRT (Ideal Gas Law) n = PV RT
n = 90.3 kPa x .890 L 8.31 L*kPa x 294 K mol*K n = .032 moles O2 Back
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Category 5 300 pts What is the partial pressure of helium if the total pressure of a rigid container is 53.1 kPa and oxygen’s pressure in the tank is 34.3 kPa? Back
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Category 5 300 pts Answer Back P total = PHe +PO2
53.1 kPa = PHe kPa PHe = 53.1 – 34.3 = 18.8 kPa Back
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Given the following partial pressures, solve for the total pressure:
Category 5 200 pts Given the following partial pressures, solve for the total pressure: PN2 = 22.1 kPa PO2 = 9.4 kPa PCO2 = 2.2 kPa Back
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Category 5 200 pts Answer Back P total = PN2 +PO2 +PCO2
33.7 kPa = Back
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Category 5 100 pts 2 H2O (l) 2 H2 (g) + O2 (g)
How many liters of H2 are produced if 4 L of oxygen were produced, at STP? Back
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4 L O2 x 1 mole O2 x 2 moles H2 x 22.4 L H2 = 8 L
Catergory 5 100 pts Answer 2 H2O (l) 2 H2 (g) + O2 (g) How many liters of H2 are produced if 4 L of oxygen were produced, at STP? 4 L O2 x 1 mole O x 2 moles H2 x L H = 8 L L O mole O mole H2 Back
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Category 6 500 pts Type Question Here Back
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Category 6 500 pts Answer Type Answer Here Back
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Category 6 400 pts Type Question Here Back
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Category 6 400 pts Answer Type Answer Here Back
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Category 6 300 pts Type question Here Back
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Category 6 300 pts Answer Type Answer Here Back
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Category 6 200 pts Type Answer Here Back
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Category 6 200 pts Answer Type Answer Here Back
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Category 6 100 pts Type Question Here Back
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Catergory 6 100 pts Answer Type Answer Here Back
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Final Jeopardy If you are making pasta in Los Angeles and at the same time, your best friend in Colorado Springs is doing the exact same thing, whose pasta will cook first and why? Back
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Final Jeopardy Answer Back
LOS ANGELES – the boiling point of water in Los Angeles is higher than the boiling point of water in Colorado Springs. WHY? Water boils when the vapor pressure equals the atmospheric pressure. Because the atmospheric pressure in L.A. is higher than that in Colorado Springs, so even though the water in L.A. will boil second, it will have a higher temperature providing more heat. THUS, the pasta in L.A. will be done first. Back
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This Jeopardy Game was Created by: SaraFeltman, 5th Grade Teacher Scott Elementary School School Year Revised: RLipkowitz 2000
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