c# barcode reader from image U Step 4 Review the Knowledge You Need to Score High in Visual C#.NET

Decode Data Matrix 2d barcode in Visual C#.NET U Step 4 Review the Knowledge You Need to Score High

116 U Step 4 Review the Knowledge You Need to Score High
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15 A steel tank containing argon gas has additional argon gas pumped into it at constant temperature Which of the following is true for the gas in the tank (A) There is no change in the number of gas atoms (B) There is an increase in the volume of the gas (C) There is a decrease in the pressure exerted by the gas (D) The gas atoms travel with the same average speed (E) The gas atoms are separated by a greater average distance 16 2 N2O5(s) 4NO2(g) + O2(g) A 2 L evacuated flask has a 02 mol sample of N2O5(s) sealed inside it The flask is heated to decompose the solid and cooled to 300 K The N2O5(s) is completely decomposed according to the balanced equation above What is the nearest value to the final total pressure of the gases in the flask (The value of the gas constant, R, is 0082 L 1 1 atm mol K ) (A) 06 atm (B) 6 atm (C) 005 atm (D) 12 atm (E) 3 atm 17 A glass container is filled, at room temperature, with equal numbers of moles of H2(g), O2(g), and NO2(g) The gases slowly leak out through a pinhole After some of the gas has effused, which of the following is true of the relative values for the partial pressures of the gases remaining in the container (A) H2 < NO2 < O2 (B) NO2 < H2 < O2 (C) H2 = NO2 = O2 (D) O2 < NO2 < H2 (E) H2 < O2 < NO2 18 Choose the gas that probably shows the greatest deviation from ideal gas behavior (A) He (B) O2 (C) SF4 (D) SiH4 (E) Ar 19 Determine the formula for a gaseous silane (SinH2n+2) if it has a density of 547 g per L at 0 C and 100 atm (A) SiH4 (B) Si2H6 (C) Si3H8 (D) Si4H10 (E) Si5H12 20 Which of the following best explains why a hotair balloon rises (A) The heating of the air causes the pressure inside the balloon to increase (B) The cool outside air pushes the balloon higher (C) The temperature difference between the inside and outside air causes convection currents (D) Hot air has a lower density than cold air (E) Cooler air diffuses more slowly than the warmer air
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Gases 117
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U Answers and Explanations
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1 C This question relates to the combined gas law: P1V1/T1 = P2V2/T2 Since the pressure remains constant, the pressures may be removed from the combined gas law to produce Charles s law: V1/T1 = V2/T2 This equation may be rearranged to: T2 = V2T1/V1 The doubling of the volume means V2 = 2 V1 On substituting: T2 = 2V1T1/V1; giving T2 = 2T1 The identity of the gas is irrelevant in this problem 2 E This problem depends on the ideal gas equation: PV = nRT R, V, and T are known, and by using the partial pressure for a gas, the number of moles of that gas may be determined To convert from moles to mass, the molar mass of the gas is needed 3 B Since T and P are known, and since the moles (n) can be determined from the masses given, this question could use the ideal gas equation The number of moles of each gas is 050 Equal moles of gases, at the same T and P, have equal volumes Equal volume eliminates answer choice D Equal volume also means that the greater mass has the greater density, eliminating choice A Equal moles means that the numbers of molecules and atoms are equal, eliminating choice E The average kinetic energy of a gas depends on the temperature If the temperatures are the same, then the average kinetic energy is the same, eliminating C Finally, at the same temperature, heavier gases travel slower than lighter gases Nitrogen is lighter than argon, so it travels at a faster average speed, making B the correct answer You may find this reasoning process beneficial on any question in which you do not immediately know the answer 4 A This experiment requires the ideal gas equation The mass of the solid is needed (to convert to moles); this eliminates answer choice D The volume, temperature, and pressure must also be measured during the experiment, eliminating choices B, C, and E The measured pressure is the total pressure Eventually the total pressure must be converted to the partial pressure of the gas using Dalton s law The total pressure is the sum of the pressure of the gas plus the vapor pressure of water The vapor pressure of water can be looked up in a table when the calculations are performed (only the temperature is needed to find the vapor pressure in a table) Answer A is correct 5 C Real gases are different from ideal gases because of two basic factors (see the van der Waals equation): molecules have a volume, and molecules attract each other The molecules volume is subtracted from the observed volume for a real gas (giving a smaller volume), and the pressure has a term added to compensate for the attraction of the molecules (correcting for a smaller pressure) Since these are the only two directly related factors, answers B, D, and E are eliminated The question is asking about volume; thus, the answer is C You should be careful of NOT questions such as this one 6 C A balanced chemical equation is needed: 2 Al + 6 HCl 2 AlCl3 + 3 H2 The reaction produced 336L/224 L or 150 mol at STP To produce this quantity of hydrogen, (2 mol Al/3 mol H2) 150 moles H2 = 100 mol of Al is needed The atomic weight of Al is 270; thus, 270 g of Al are required 7 D The partial pressure of any gas is equal to its mole fraction times the total pressure The mole fraction of carbon monoxide is [030/(060 + 030 + 010)] = 030, and the partial pressure of CO is 030 080 atm = 024 atm
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