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

Category 1 500 pts If temperature is doubled and volume is cut in half, what happens to the pressure? Back

Pressure is 4 times the original Category 1 500 pts Answer Pressure is 4 times the original Back

Category 1 400 pts At constant temperature, if pressure is quadrupled, what happens to volume? Back

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

What relationship does John’s Law demonstrate? Category 1 300 pts What relationship does John’s Law demonstrate? Back

Direct relationship between pressure and temperature Category 1 300 pts Answer Direct relationship between pressure and temperature P1 = P2 T1 T2 Back

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

Boyle’s Law – inverse relationship Category 1 200 pts Answer Boyle’s Law – inverse relationship Back

What does Charles’ Law state? Category 1 100 pts What does Charles’ Law state? Back

Catergory 1 100 pts Answer At constant pressure, direct relationship between volume and temperature Back

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

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 284 K P2 = 124.22 mm Hg Back

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

Category 2 400 pts Answer Volume is constant, so use John’s law. P1 = P2 4.7 atm = 3.5 atm T1 T2 305 K T2 T2 = 227.13 K – 273 = -45.87 oC Back

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

Category 2 300 pts Answer Pressure is constant, so use Charles’ law. V1 = V2 34 mL = 86 mL T1 T2 294.8 K T2 T2 = 745.67 K Back

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

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

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

Catergory 2 100 pts Answer Temp is held constant, so it is Boyle’s law. Pressure increases while the volume decreases. Back

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

Category 3 500 pts Answer Back 8 g O2 x 1 mole O2 x 22.4 L O2 = 1 32 g O2 1 mole O2 5.6 L Back

Category 3 400 pts What is the Kelvin value for absolute zero, and what theoretically happens at this temperature? Back

Category 3 400 pts Answer ZERO Kelvin (0K) and in theory all matter will stop moving at this temperature. Back

Category 3 300 pts What is 550K in oC? Back

Category 3 300 pts Answer 277 oC K = 273 + oC oC = K - 273 Back

Category 3 200 pts What is 38.5 oC in Kelvin? Back

Category 3 200 pts Answer 311.5 K K = 273 + 38.5oC Back

What are the four values for Standard Pressure? Category 3 100 pts What are the four values for Standard Pressure? Back

Catergory 3 100 pts Answer 101.3 kPa = 760 torr = 760 mm Hg = 1 atm Back

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

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

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

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

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

Category 4 300 pts Answer This is an example of John’s law – when temp goes down, pressure goes down. Back

Category 4 200 pts Explain why the Ivory soap expanded in the microwave and which gas law applies to this situation. Back

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

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

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

Category 5 500 pts At what pressure would 0.150 mole of nitrogen gas at 23.0 °C occupy 8.90 L? Back

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

Category 5 400 pts How many moles of oxygen gas are contained in a 890.0 mL container at 21.0 °C and 90.3 kPa? Back

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

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

Category 5 300 pts Answer Back P total = PHe +PO2 53.1 kPa = PHe + 34.3 kPa PHe = 53.1 – 34.3 = 18.8 kPa Back

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

Category 5 200 pts Answer Back P total = PN2 +PO2 +PCO2 33.7 kPa = 22.1 + 9.4 + 2.2 Back

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

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 O2 x 2 moles H2 x 22.4 L H2 = 8 L 1 22.4 L O2 1 mole O2 1 mole H2 Back

Category 6 500 pts Type Question Here Back

Category 6 500 pts Answer Type Answer Here Back

Category 6 400 pts Type Question Here Back

Category 6 400 pts Answer Type Answer Here Back

Category 6 300 pts Type question Here Back

Category 6 300 pts Answer Type Answer Here Back

Category 6 200 pts Type Answer Here Back

Category 6 200 pts Answer Type Answer Here Back

Category 6 100 pts Type Question Here Back

Catergory 6 100 pts Answer Type Answer Here Back

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

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

This Jeopardy Game was Created by: SaraFeltman, 5th Grade Teacher Scott Elementary School 1999-2000 School Year Revised: RLipkowitz 2000