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## The weakest link

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**Round 1**14 questions 10 second delay**What are the postulates of the Kinetic molecular theory?**• Gases are made of small particles • Take up little volume compared with the volume of the container • Move in straight lines • Have no attractive or repulsive forces (mostly) • Elastic collisions • Average kinetic energy = temp.**The random movement of particles from an area of high**concentration to an area of low concentration is: • Diffusion**Is effusion is directly or inversely proportional to the**square root of molar mass? • Inversely**Is Pressure directly or inversely proportional to volume**according to Boyles law? • Inversely**Is temperature directly or inversely proportional to volume**according to charles law? • Directly**Is temperature directly or inversely proportional to**pressure according to gay lussacs law? • Directly**Molecules with a small atomic mass typically form which**state of matter? • Gas**When a gas is heated what property will increase?(Pressure,**volume, both neither?) • Both**When a bond forms is it endothermic or exothermic**• Exothermic**End of round**Who is the weakest link**Round 2**12 questions 30 second delay**Calculate: if a balloon has an original volume of 1.5L at**STP, what is the new pressure inside the balloon when it is compressed to 1.0L? • 1,140mmHg**Calculate: if the initial volume of a balloon is 1.5L at**standard pressure and room temp (25°C). What will the new volume of the balloon be when the temp drops to 3°C? • 1,140mmHg**Calculate: 500mL sample of O2 gas at 760mmHg is compressed**to 100mL what will the new pressure be? • 3800mm Hg**Calculate: a sample of gas occupies 45.2mL at 720mm Hg.**What is its volume at standard atmospheric pressure? • 43mL**Calculate: A sample of oxygen is collected over water at a**total pressure of 755 torr at 20°C. Calculate the pressure of oxygen, if water vapor has a partial pressure of 17.5 torr at 20°C. • 737.5 torr**Calculate: What is the partial pressure of hydrogen gas in a**mixture of hydrogen and helium if the total pressure is 600 mm Hg and the partial pressure of helium is 439 mm Hg? • 161 mm Hg**Calculate: Find the total pressure for a mixture that**contains four gases with partial pressures of 5.00 KPa, 4.46 KPa, 3.02 KPa, and 1.20 KPa. • 13.78 KPa**Calculate: you have 5.00 L of helium in a balloon at 1.00**atm, if you decrease the volume to 2.00 L, what would your balloons pressure be? • 2.5atm**Calculate: The pressure of a sample of helium is a 1.00L**container is 0.988atm, what is the new pressure if the sample is placed in a 2.00L container? • 0.494 atm**Calculate: A sample of neon gas occupies 0.220L at 0.860atm,**what ill be it’s volume oat 29.2kPa pressure? • 0.657L**Calculate: What is the volume of air in a balloon that**occupies 0.620L at 25°C if the temperature is lowered to 0.00°C? • 0.57L**Calculate: A gas at 89°C occupies a volume of 0.67L. At**what Celsius temperature will the volume increase to 1.12L? • 330°C**End of round**Who is the weakest link**Round 3**10 questions 30 second delay**What is the combined gas law?**P1V1 = P2V2 T1 T2**Which three (3) laws are demonstrated by the combined gas**law? • Boyles • Charles • Gay-lussacs**Calculate: A helium filled balloon at sea level has a volume**of 2.1L at 0.998atm and 36°C. If it is raises to an elevation at which the pressure is 0.900atm and the temperature is 28°C, what will the new volume of the balloon be? • 2.3L**Calculate: At 0.00°C and 1.00atm, a sample of gas occupies**30.0mL. If the temperature is increased to 30.0°C and the entire sample is transferred to a 20.0mL container, what will the gas pressure be inside the container? • 1.66atm**What is the ideal gas equation?**• PV=nRT**What does the n in the ideal gas equation stand for?**• PV=nRT**What the equation used to calculate Molar mass if you are**given density of a gas? • M = DRT/P**What is the units of the ideal gas constant?**• mmHg L/mol K**calculate the number of moles of a gas contained in a 3.0L**vessel at 300K with a pressure of 1.5atm 0.18mol = n**At what temperature would 2.10 moles of N2 gas have a**pressure of 1.25 atm and in a 25.0 L tank? • 181 K**End of round**Who is the weakest link**Round 5**6 questions 10 second delay**What volume is occupied by 5.03 g of O2 at 28°C and a**pressure of 0.998atm? • 3.9 L**Calculate the pressure in a 212 Liter tank containing 23.3**kg of argon gas at25°C? • 67.3 atm**End of round**Who is the weakest link**Round 4**8 questions 10 second delay**Which phase of matter has the HIGHEST attractive forces?**• Solids**The resistance of a substance to flow is called:**• Viscosity**Which state of matter takes the MOST pressure to compress:**• Solids**The resistance of a substance to flow is called:**• Viscosity**Viscosity is controlled by three properties name one.**• Temperature • Attraction • shape**What property of water is a measure of the inward pull of**the molecules? • Surface tension