67%(6)4 out of 6 people found this document helpful
This preview shows page 55 - 57 out of 68 pages.
143.In 1995 a man suffocated as he walked by an abandoned mine in England. At that moment there was a sharp drop in atmospheric pressure due to a change in the weather. Suggest what might have caused the man's death.A)The oxygen concentration near the man dropped, pushed away by other gases.B)Poisonous gases expanded and flowed up out of the mine.C)It's more likely that he was poisoned, than suffocated.D)All of the above.Use the following to answer questions 144-145:Acidic oxides such as carbon dioxide react with basic oxides like calcium oxide (CaO) and barium oxide (BaO) to form salts (metal carbonates).144.Write an equation representing the CaO reaction.A)CaO(s) + CO(g) CaCO2(s)B)CaO(s) + CO2(g) CaCO3(s)C)2 CaO(s) + CO2(g) Ca2CO3(s)D)CaO(s) + 2 CO2(g) CaCO3(s) + CO2(g)145.A student placed a mixture of BaO and CaO of combined mass 4.88 g in a 1.46-L flask containing carbon dioxide gas at 35 °C and 746 mmHg. After the reactions were complete, she found that the CO2pressure had dropped to 252 mmHg. Calculate the percent composition by mass of the mixture. Assume volumes of the solids are negligible.A)10.5% CaO; 89.5% BaOB)89.5% CaO; 10.5% BaOC)26.7% CaO; 73.3% BaOD)73.3% CaO; 26.7% BaO
Use the following to answer questions 146-147:Air at 1.0 atm and 22 °C is needed to fill a 0.98-L bicycle tire to a pressure of 5.0 atm at the same temperature. (Note that the 5.0 atm is the gauge pressure, which is the difference between the pressure in the tire and atmospheric pressure. Before filling, the pressure in the tire was 1.0 atm.)146.Find the volume of air needed.A)3.92 LB)4.90 LC)5.88 LD)11.8 L147.What is the total pressure in the tire when the gauge pressure reads 5.0 atm?A)4 atmB)5 atmC)6 atmD)7 atm148.A bicycle tire is pumped by filling the cylinder of a hand pump with air at 1.0 atm and then, by compressing the gas in the cylinder, adding all the air in the pump to the air in the tire. If the volume of the pump is 33 percent of the tire's volume, what is the gauge pressure in the tire after three full strokes of the pump? Assume constant temperature and that the initial gauge pressure was zero.A)0.33 atmB)1.0 atmC)2.0 atmD)3.3 atmUse the following to answer questions 149-150:The running engine of an automobile produces carbon monoxide (CO), a toxic gas, at the rate of about 188 g CO per hour. A car is left idling in a poorly ventilated garage that is 6.0 m long, 4.0 m wide, and 2.2 m high at 20 °C.