Answers created by Truong-Son N.

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• What photon energy could be absorbed by a hydrogen atom that is in the n = 2 state?
  
• What is the change in freezing point when #"54 g"# of glucose (use #"FW" = "180 g/mol"#) is dissolved in #"0.250 kg"# of water? #K_f = 1.86^@ "C/m"# for water.
  
• Does a solution with the concentration of [OH-] = 4.3 x #10^-5# M have a pH of 5?
  
• Why do fluoride salts give basic solutions in water?
  
• Is this phrase correct? "average kinetic energy isn't so hot"
  
• How to calculate the change in the entropy of hydrogen molecule before and after the adsorption?
  
• What is the change in entropy for an adiabatic expansion against an external pressure for an ideal gas?
  
• How do you convert from #%"w/v"# to molarity?
  
• What is the term used for a well insulated reaction vessel used to measure delta H of reactions?
  
• How does Planck's radiation law relate to temperature? What conclusions can be drawn from it?
  
• Which of the following binary solutions of volatile liquids have negative deviation?
  
• Explain what it means for a system to be in equilibrium. How do we express this in a chemical reaction (give an example)?
  
• Which of the following sets of 3 quantum numbers is/are possible?
  
• What is the oxidation state of sulfur in #"S"_4"O"_6^(2-)#?
  
• In a saturated hydrocarbon, what are all the bonds?
  
• What is another way to name 2-[(Methoxycarbonyl)oxy]benzoic acid?
  
• What are two characteristics of a molecule that make it suitable for analysis by infrared spectroscopy?
  
• Question #12312
  
• What is the new volume of the gas in a #"33.0-L"# balloon that rises from an altitude with a pressure of #"100.4 kPa"# into the stratosphere where the pressure is #"21.8 kPa"#?
  
• What mass in #"mg"# of #"O"_2# gas is found in #"469.9 mL"# of it contained at #"755 mm Hg"# and #60^@ "C"#?
  
• What volume of hydrogen gas is obtained when #"43.39 g"# of sulfuric acid reacts with solid aluminum metal?
  
• How many mols of nitrogen gas are contained in a #"8.349 L"# container held at #"200.6 torr"# and #64^@ "C"#?
  
• Question #17c0e
  
• Help out with the following questions about the Nernst equation and #"NAD"^+#, cytochrome c, and #"Fe"# ions?
  
• Suppose #"6g"# of #"H"_2# and #"16 g"# of #"CH"_4# are in a #"1-L"# box divided in half by a thin partition, each gas at the same initial pressure #P# in #"atm"#. Upon mixing the gases, find the total pressure?
  
• We say that Temperature is basically average kinetic energy so can't we say that unit of temperature is Joules??
  
• If the volume of an ideal gas at #27^@ "C"# halves, what is its new temperature? Why can I not use the celsius temperature to do this?
  
• Write out the balanced reactions for combustion of methanol, ethanol, propanol, butanol, and pentanol?
  
• Is #HNO_2# considered a strong or weak acid?
  
• What instrument is used to measure temperature?
  
• How do you round #1721.344# to three significant figures?
  
• What is the product of electron capture in silver-106?
  
• When gas molecules collide, why is there no loss in kinetic energy?
  
• If it takes #"3 min"# for #40%# of sucrose to dissolve in a certain amount of water, how long does it take for all but #10%# of the sugar to dissolve?
  
• Which statement is correct one and how? 1- Which number has three significant figures? 2- Which number has three significant digits?
  
• What is the product of para-sulfonyltoluene with #"Br"_2# catalyzed by #"FeBr"_3#, followed by treatment with dilute sulfuric acid?
  
• Which of these reactants would be the most susceptible to electrophilic aromatic substitution (EAS)? #"PhN"("CH"_2)_3("CH"_3)_3^(+)# or #"PhN"("CH"_2)_3("CH"_3)_3^(+)#? Which would then yield the lowest, and highest, percentage of the meta isomer?
  
• What gas is released when acid added to a metal?
  
• When is a gas most likely to change to the liquid phase in terms of pressure?
  
• Full steps of getting Nernst's equation?
  
• What is the greatest common factor for #84# and for #48#? What about their least common multiple?
  
• A solution of #H_2SO_4(aq)# with a molal concentration of 3.58 m has a density of 1.200 g/mL. What is the molar concentration of this solution?
  
• How do you find the number of molecules in #"2 L CO"_2#?
  
• Use this equation to find the equilibrium constant?
  
• Approximately what is the pH of a 0.1 M acetic acid solution?
  
• If I have #6"HCl"#, why can't I change the subscripts and write #3"H"_2"Cl"_2#?
  
• #NH_4C_2H_3O_2#, is made of how many elements?
  
• What is the kinetic energy for one electron whose wavelength is #"650 nm"#? Its rest mass is #9.109 xx 10^(-31) "kg"#.
  
• Guys, how do I make m-nitrobenzoic acid if I have benzene as a starting compound?
  
• The solubility of carbon dioxide in water is 0.161 g #CO_2# in 100 mL of water at 20°C and 1.00 atm. A soft drink is carbonated with carbon dioxide gas at 5.50 atm pressure. What is the solubility of carbon dioxide in water at this pressure?
  
• For the reaction #4"XY"_3 + 7"Z"_2 -> 6"Y"_2"Z" + 4"XZ"_2#, what is the enthalpy change? The steps are shown below.
  
• If #"35.00 mL"# of #"0.211 M"# #"HCl"# was neutralized by #"34.60 mL"# of #"KOH"#, what was the concentration of #"KOH"#?
  
• How does the polarization of the carbonate ion make the thermal decomposition of CaCO3 more likely?
  
• Does vapor pressure vary with the number of particles in solution? What if you have #"1 M"# of #"NaCl"#, vs. #"1 M"# #"KCl"#, vs. #"1 M"# #"CaCl"_2#?
  
• How many electrons are in orbitals with #l = 3# within moscovium?
  
• Question #b6e0c
  
• Determine, in standard form, the equation of the straight line parallel to #3x - 6y = 6# that passes through #(4,-3)#?
  
• If the mol ratio of nitrogen and oxygen is #4:1#, what is the ratio of their solubilities in terms of mol fractions? Take #k_H = 3.3 xx 10^7 "torr"# for #"N"_2(g)# and #6.6 xx 10^7 "torr"# for #"O"_2(g)#.
  
• If the #K_b# of a weak base is #1.2 times 10^-6#, what is the pH of a 0.34 M solution of this base?
  
• Question #bd44f
  
• How do you simplify #87.5#?
  
• What is the mol fraction of water in an aqueous solution of #"3 M NaOH"#?
  
• What element has a molar mass of #"5.00 g/mol"#?
  
• Can someone explain how do I set up a molecular orbital diagram?
  
• Question #672a6
  
• What is the percent by mass of #"12 M HCl"#?
  
• How do freezing point, boiling point, and vapor pressure for the solvent change upon addition of a solute?
  
• Question #988ef
  
• Question #2e939
  
• For the combustion reaction #4"NH"_3(g) + 5"O"_2(g) -> 4"NO"(g) + 6"H"_2"O"(g)#, how many liters of #"O"_2(g)# would react with #"500 L"# of #"NH"_3# at STP?
  
• What are the major products of these aldol reactions?
  
• Given a photoelectron spectrum, either #"F"# or #"C"# is peak #"X"# and the other is peak #"Y"#; both are the first ionization. #"X"# is further to the left and the x-axis reports increasing electron energy. Which atom corresponds to which peak and why?
  
• How would I do a calculation for an electroplating of solid metal onto the cathode in an electrolytic cell if, say, I am given current and the time that it took? What helps increase the mass yielded?
  
• Determine the bond order of the #"C"-"O"# bond in the following molecules, and then arrange the #"C"-"O"# bond lengths in increasing order? #"CO"#, #"CO"^(+)#, #"CO"^(2+)#, #"CO"_2#, #"CO"_3^(2-)#
  
• What is the number of neutrons in a nucleus?
  
• What are three examples of proper units you could use to measure perimeter?
  
• What is chromium's molecular weight?
  
• What type of interaction is depicted by the dashed line?
  
• What is the molarity of #98%# #"H"_2"SO"_4#?
  
• What is the mol fraction of ethanol in a #"4.4 mol/kg"# aqueous solution?
  
• Only we can calculate the energy emitted when #n_x rarr n_t#only in the hydrogen atom not in any other atom. When will be the new equation which can apply to all atoms found in the future?????
  
• Explain why photochemical reactions are generally zero order?
  
• What is the hybridization about the nitrogen center in #"NCl"_2^(+)#?
  
• A certain aqueous solution contains #"0.27 mols"# of weak acid #"HA"#. If #"12.0 mL"# of #"3.10 M"# #"NaOH"# was added to it, resulting in a #"pH"# of #3.80#, what is the #"pK"_a# of the weak acid?
  
• The temperature coefficient for a certain reaction is #2#. If the temperature of the reaction was raised by #"40 K"#, what is the approximate factor to which the rate is multiplied?
  
• What does shorthand notation mean?
  
• How to relate the transmittance to the absorbance, concentration, and molar absorptivity?
  
• How can I calculate delta G of vaporization?
  
• Calculate the #"pH"# for #"0.270 M"# benzoic acid? #K_a = 6.5 xx 10^(-5)#
  
• For #"1.25 M"# of acetic acid (#K_a = 1.8 xx 10^(-5)#), determine the percent dissociation?
  
• Which of these are results of physical changes?
  
• Can someone please thoroughly explain titrations and their graphs? Thank you!
  
• Why is the surface tension of water higher than that of ethanol?
  
• Show that for a closed loop in a Carnot engine, the energy is conserved in the heat flow at a certain temperature in each reservoir, i.e. show that #q_H/T_H + q_C/T_C = 0#?
  
• Question #a9319
  
• How much propane is required to power the stove that heats and vaporizes this water? What was the efficiency?
  
• Are the effusion rates of carbon dioxide and propane the same?
  
• How to get new concentration from percent transmittance?
  
• For the reaction #2A + B -> 3C#, if the rate of disappearance of #B# is #"0.30 mol/L"cdot"s"#, how do you set up a calculation to determine the rate of disappearance of #A# and appearance of #C#?
  
• For a solution with benzene as the solvent, what is the molality (with respect to the solute) if the solution has a solute mol fraction of #0.2#?
  
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