Answers edited by Professor Sam

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• Question #c4606
  
• Given that #DeltaG# for the reaction #4NH_(g) + 5O_2(g) -> 4NO(g) + 6H_2O(g)# is -957.9 kJ, what is #DeltaG)f# of #H_2O#?
  
• How many alpha particles are emitted in the series of radioactive decay events from a U-238 nucleus to a Pb-206 nucleus?
  
• Question #2f974
  
• Question #fd7ab
  
• Question #37f75
  
• Question #d9f07
  
• Question #67a25
  
• A physicist must make sure that the temperature of a metal at 0 deg C gets no colder than -80 deg C. The physicist changes the metal's temperature at a steady rate of -4 deg C per hour. For how long can the physicist change the temperature?
  
• How do you get ethanoic acid from ethyne gas?
  
• How would you order the following elements with respect to electron affinity: #Cl^-, Ar, K^+, Ti, Ti^(+2)#?
  
• Question #eafbb
  
• Question #08525
  
• Question #c11d7
  
• Question #a721d
  
• What is the #DeltaH_f^@# of liquid water ? Show calculation with bond energies
  
• If a sample of N gas was put into a flexible container at an pressure of 25.5kPa, temperature of 35.9 C and a volume of 500. mL, what would the final temperature of the gas be if the pressure was changed to .625 atm and the volume was change to 625mL?
  
• What is #K_a# of #"ZnCl"_2# ?
  
• Question #d327a
  
• What is the pH of a mixture that contains 0.60 M # HCl# and 0.30 M #HNO_2#?
  
• How would you balance this equation: #?Pb(NO_3)_2 → ?Pb + ?NO_2 + ?O_2#?
  
• How do you determine alpha decay?
  
• Which nuclide will decay by positron and what isotope will be the left over? Both answers must be correct. (Numbers represent the mass number): 32S, 32P; 26P, 26S; 14O, 14N; 14N, 14O
  
• Question #95a18
  
• Why is #ZnCl_2# is an acid though it does not have a #H^+# or a #OH^-#?
  
• Question #8f7c2
  
• A quantity of a gas at a temperature of #223# #K# has a volume of #100.0# #dm^3# To what temperature must the gas be raised, while the pressure is kept constant, to give a volume of #185# #dm^3#?
  
• How do you solve #6/5=2/(5n)#?
  
• Question #be5e0
  
• Question #1699a
  
• Which of these is NOT true?
  
• What is the pressure of a sample of #CH_4# gas (6.022 g) in a 30.0 L vessel at 402 K?
  
• Suppose a balloon containing 1.30 L of air at 24.7°C is placed into a beaker.containing liquid nitrogen at -78.5°C. What will the volume of the sample of air become (at constant pressure)?
  
• Question #57ac0
  
• Which missing item would complete this alpha decay reaction?
  
• Question #65f39
  
• If the pressure of 50.0 mL of oxygen gas at 100°C increases from 735 mm Hg to 925 mm Hg, what is the final volume? Assume the temperature remains constant.
  
• A balloon has a volume of 2.9 L at 320 Kelvin. If the temperature is raised to 343 Kelvin, what will its volume be?
  
• What is the term for the lumps that form when an acid is added to milk?
  
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