please help with all questions 1 to 20 to confirm
Assignment: Chapter 9. Gases Pressure is defined as: A) force divided by unit area. B) force times unit area. C) mass divided by acceleration. D) mass times acceleration. 2. Which of the following instruments directly measures the pressure of a gas? A) spectrometer B) manometer C) polarimeter D) gas chromatograph >> The SI unit for pressure is the: A) atmosphere. B) mmHg. C) newton. D) pascal. 4. Which is the smallest quantity of pressure? A) 1 atm B) 1 centimeter of Hg C) 1 mm Hg D) 1 pascal s. If mercury (density = 13.6 g/cm3) at a height of 745 mm Hg in a mercury barometer is replaced with water (density = 1.00 g/cm3), under the same conditions the height of water will be: A) 0.180 ft. B) 2.44 ft. C) 33.2 ft. D) 399 ft. In an open-end manometer, one end of a U-tube filled with mercury is attached to a gas-filled container and the other end is open to the atmosphere. If the gas pressure in the container is less than atmospheric pressure. A) Hg will be forced out of the open end of the U-tube. B) the difference between the Hg levels in the two arms will be greater than 76 cm. C) the Hg level will be higher in the arm connected to the container. D) the Hg level will be higher in the arm open to the atmosphere 7) Which of the following equations represents "Boyle's law"? A) = k B)=k C) PV = k D) V = nk 8) Which law does the equation, * = k represent? A) Avogadro's law B) Boyle's law C) Charles' law D) Graham's law 9) A basketball is inflated to a pressure of 2.10 atm in a 20.0C garage. What is the pressure of the basketball outside where the temperature is -5.00C? A) 1.92 atm B) 2.29 am C) 2.10 atm D) 2.50 atm 10) The volume of 350 mL of gas at 25C is decreased to 250 mL at constant pressure. What is the final temperature of the gas? A) -60.1C B) 213C C) 17.8C D) 144C 11) A balloon filled with helium gas at 20C occupies 2.91 L at 1.00 atm. The balloon is immersed in liquid nitrogen at -180C, raising the pressure to 5.20 atm. What is the volume of the balloon in the liquid nitrogen? A) 0.178 L B) 5.62 L C) 5.04 L D) 0.199 L 12) How many molecules of N2 are in a 250.0 mL container at 780 mm Hg and 135C? A) 4.38 x 1021 molecules B) 4.62 x 1021 molecules C) 1.32 x 1022 molecules D) 1.39 x 1022 molecules 13) The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H20(1) - 2 NaAl(OH)4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 8.64 g of Al reacts with excess NaOH? A) 4.78 L B) 7.18 L C) 10.8 L D) 11.7 L 14) At STP how many liters of NH3 can be produced from the reaction of 6.00 mol of N2 with 6.00 mol of H2? N2(g) + 3 H2(g) 2 NH3(g) A) 44.8 L B) 89.6 L C) 134 L D) 269 L 15) A balloon contains 0.76 mol N2, 0.18 mol Ar, 0.031 mol He, and 0.026 mol H2 at 739 mm Hg. What is the partial pressure of Ar? A) 19 mm Hg B) 23 mm Hg C) 130 mm Hg D) 560 mm Hg 16) The ozone molecules in the stratosphere absorb much of the ultraviolet radiation from the sun, protecting life on Earth. At a certain altitude, the temperature of the stratosphere is 240 K and the partial pressure of ozone is 1.4 x 10-7 atm. Calculate the number of ozone molecules present in 1.00 L of atmosphere at that altitude. A) 2.1 x 1015 molecules of O3 B) 4.3 x 1015 molecules of O3 C) 8.0 1031 molecules of O3 D) 1.8 x 1032 molecules of O3 17) Some assumptions from the kinetic molecular theory are listed below. Which one is most frequently cited to explain Charles' law? A) The average kinetic energy of gas particles is proportional to the Kelvin temperature. B) Collisions of gas particles are elastic and total kinetic energy of the gas is constant. C) A gas consists of tiny particles moving in random straight-line motion. D) The volume of the particles is negligible compared to the volume of the gas. 18) According to the kinetic molecular theory, the pressure of a gas in a container will decrease if the: A) number of collisions with the container wall increases. B) number of moles of the gas increases. C) temperature of the gas decreases. D) volume of the container decreases. 19) An unknown gas effuses 2.3 times faster than N204 at the same temperature. What is the identity of the unknown gas? A) CN2 B) NH3 C) N20 D) 03 20) Which statement about real gases is true? A) The volume of the gas particles is zero. B) The mass of the gas particles is zero. C) Forces of attraction and repulsion exist between gas particles at close range. D) The behavior of real gases can be exactly predicted using the ideal gas law
