Answers created by Truong-Son N.

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• In #ddotCX_2#,both the electron get paired up in #sp^2# hybrid orbital.Thus,#ddotCX_2# exists in the form of singlet state.Why?{here #X# refers to halogen}
  
• m-nitrobenzoic acid from benzene?
  
• What values exactly associated with orbitals px, py, pz, dxy, dyz, dzx, dx^2-y^2,dz^2.? Pl be specific whether px is +1 0 or -1
  
• Use Newton's Law of Cooling, #T = C + (T_0 - C)e^(kt)#, to solve the problem. Thanks?!
  
• A well-known aphorism in chemistry is that for every 10° increase in temperature, the rate of a reaction will increase twofold. If the reaction were performed at 45° C predict whether it would occur at twice the rate of the reaction performed at 35° C ?
  
• For the reaction A <--> B, if the equilibrium constant is Keq = 11.7, and 4.0g of A (FW = 100g/mole) are initially placed into 5.0 L of solution. ?
  
• Let #phi_n# be the properly-normalized nth energy eigenfunction of the harmonic oscillator, and let #psi = hatahata^(†)phi_n#. What is #psi# equal to ?
  
• If #DeltaH_c^@# of solid benzoic acid at 27°C is -x kcal/mol, then #DeltaE_c^@# (in kcal/mol) is?
  
• Heat of fusion of ice is 6 kilo joule per mole , hence the entropy change for fusion of 10 g ice at 1 ATM is......?
  
• In the Cr3+ion, how many electrons have ms=+1/2?
  
• The energy need to liquify 10g of ice is 3.6kJ.If the radiation with frequency 4.53×10^14 Hz is used to liquify 5g of ice,the number of energy photons need for this is,? 1: 12×10^21 2: 6×10^21 3: 24×10^21 4: 18×10^24 5: 12×10^20
  
• In the Cr3+ ion,how many electrons have n+1=4 and ms=-1/2?
  
• What is Ka at 25 °C for the following equilibrium? CH3NH3+(aq) + H2O(l) CH3NH2(aq) + H3O+(aq) Kb (CH3NH2) = 4.4 × 10–4 at 25 °C. a. 4.4 × 10–4 b. 2.3 × 103 c. 4.4 × 10–10 d. 4.4 × 104 e. 2.3 × 10–11
  
• How do you calculate specific heat without the final temp to calculate ΔT?
  
• Choose the correct Kc expression when the equation for the Kc expression shown below is halved and reversed. ? A. 1/2 Kc B. 1/ (Kc)1/2 C. Kc 2 D. Kc * 2 E. 1/ Kc 2
  
• At moderately high temperatures, SbCl5 decomposes into SbCl3 and Cl2 as follows: SbCl5(g) <---> SbCl3(g) + Cl2(g) ?
  
• Using the following unbalanced equation, answer the following questions? #"NH"_4"NO"_3(s) stackrel(Delta" ")(->) "N"_2"O"(g) + "H"_2"O"(g)#
  
• How is second equivalence point calculated?
  
• How many grams of calcium carbide are produced when 4.0 moles of carbon react with an excess of calcium carbonate (CaCO3)?
  
• The value of Kp for the following reaction at 627oC is 6.55. SO2(g) + 1/2O2(g) <---> SO3(g) What is Kc at this temperature?
  
• A 2.500-mol sample of PCl5 dissociates at 160oC and 1.00 atm to give 0.338 mol of phosphorus trichloride, PCl3, at equilibrium. PCl5(g) <---> PCl3 + Cl2(g) ?
  
• Using the following unbalanced equation, answer the following questions? #"CaCO"_3(s) + "C"("gr") stackrel(Delta" ")(->) "CaC"_2(s) + "CO"_2(g)#
  
• Can you please make the MO diagrams for these ?
  
• Please solve this electrophile addition based reaction problem?
  
• Why the energy difference between first and second orbit of hydrogen is less as compared to these orbits of uranium atom?
  
• By writing molecular orbital configuration for NO,CO,O2 molecules calculate the bond order and also determine whether it is paramagnetic or diamagnetic?
  
• How do I do this limiting reactants problem about barium sulfate?
  
• How to plot the transmission coefficient as a function of #E//V_0#?
  
• Relationship between free energy, enthalpy, entropy?
  
• Which step would be the rate-determining step?
  
• Balmer series says transitions from n ≥ 3 to n = 2 as n= 2 is the ground state ? how Hydrogen atom electron gain energy from level 2 to higher levels as normally H electrons in level n = 1 ?
  
• An explanation of why an ionic bond is solid at room temperature?
  
• Entropy plays a larger role in determining the Gibbs energy of reactions that take place at what?
  
• Identify the cathode and anode, write the net cell equation, and calculate the cell potential for #"Pt"(s) | "SO"_4^(2-)(aq), "H"^(+)(aq) | "H"_2"SO"_3(aq) "||" "Ag"^(+)(aq) | "Ag"(s)#?
  
• How do I find the eigenvalues for the finite potential well of width 2L?
  
• How can I calculate the molar volume of a non ideal gas?
  
• Oxidation staze of banzealdihyde?
  
• How do I plot the energy eigenvalues and wave function solutions of a delta function double potential well with #V(chi) = -alpha(delta(chi+L)+delta(chi-L))#?
  
• Write Net cell notation; calculate cell potential.?
  
• What will be the value of #t_(0.875)/(t_(0.500))# for #n#th order reaction?
  
• HA represent a strong acid; BOH represent weak base. a) in which of the following ranges is the pH of a water solution of the Salt BA * 0-7 * 7 * 7 -14 b) explain the answer?
  
• In the topic, CHANGE IN ENTROPY why we take q(rev.) = RTlnV2/V1 ?
  
• At what temperature is this reaction at equilibrium?
  
• You are a compound in the laboratory. You find that it is made up of carbon, hydrogen, and oxygen in a ratio of two hydrogen atoms for each carbon atom. How will you classify the compound?
  
• Which of the following complexes exhibit the highest paragmagnetic behavior? a. [Co(ox)2(OH)2]^- b. [Ti(NH3)6]^3+ c. [V(gly)2(OH)2(NH3)2]^+ d. [Fe(en)(bpy)(NH3)2]^2+
  
• If #psi=A(x)e^(itheta(x))#where #A(x) and theta(x)# are real functions prove that the probability current #J(x,t) = |A(x)|^2(ℏ/m)d/(dx)(theta(x))#.?
  
• In a first order reaction A---> B the ratio of molar concentration of A and B in the reaction mixture after 100 minute is 1:3. What would be the time needed from the start to have them in the ratio of 1:1?
  
• How do I do this? #DeltaH_(rxn) = -"2219.9 kJ/mol propane"#, so how much heat is released by combustion of #"16.50 kg propane"#?
  
• For the ion #"NH"_4^+# the conductance at infinite dilution and 50deg c is 115. The equivalent conductance of #"NH"_4"NO"_3# at 50deg c and infinite dilution is 219. What is the conductance of the ion #"NO"_3^-# at 50deg c and infinite dilution?
  
• Titrations with hydrated solutions Can anyone do it?
  
• Solve for Pressure (Ideal Gas Law)?
  
• For the first order reaction A----> B+C carried out at 27°C if 3.8×10^-16 % of the reactant molecules exist in the activated state then what would be the activation energy of the reaction ?
  
• We believe in the laws of thermodynamics because they are?
  
• What is the difference of a monosaccharide and disaccharide ?
  
• Why Mg2N2 is not possible?
  
• Calculate the pH of a saturated aqueous solution of #Co(OH)_3#(#K_(sp) = 2.7*10^(-43)#)?
  
• A particle of mass m in a harmonic oscillator potential #V(x)=(momega_0^2)/(2)x^2# has an initial #psi(x,0)=1/(sqrt2)[phi_0(x) + iphi_1(x)] # where #phi_n# are the normalized eigenstates for harmonic oscillator?
  
• Should I write #H_2SO_4# like a catalyst?
  
• From #PV = 1/3 mN<< upsilon^2 >>#, show that the kinetic energy for a mole of an ideal gas is #E_k = 3/2 RT#?
  
• Does 2-methyl-3-hexanone exhibit hydrogen bonding?
  
• How do I find the reaction potential of forming #"MgO"# and #"Zn"# from #"ZnO"# and #"Mg"#?
  
• How to calculate rate of dissolution?
  
• For the reaction: H2(g)+1/2O2(g)=H2O(g). The #DeltaH_(rxn)^@# = -241.8 Jmol ^-1 What quantity of heat, in kj, evolved when a 72.0 g mixture containing equal parts of H2 and O2, by mass, is burned?
  
• The value of the rate constant for the reaction between A & B was measured using pseudo-zeroth order conditions. The overall order of reaction was determined to be third order. When B was present at...?
  
• How do you calculate equilibrium concentrations of species when the concentration of one specie is unknown?
  
• How to memorize electronegativity chart?
  
• Ammonium nitrate will decompose explosively at high temperatures to form nitrogen, oxygen, and water vapor. 2NH4NO3(s) - - > 2N2(g) + 4H2O(g) + O2(g) How many grams of NH4NO 3 are needed to produce 30 L of O 2 gas? (Assume STP.)
  
• #Psi(x,t) = sqrt(1/L)sin((pix)/L) e^-(iomega_1t ) + sqrt(1/L)sin((2pix)/L) e^-(iomega_2t )#new question?
  
• How do Grignard reagent reacts with acid halides?
  
• Why Grignard reagent don't react with alkylhalides ?
  
• Compute the root-mean-square speed of H2 molecules in a sample of hydrogen gas at a temperature of 193°C. m s-1 ?
  
• The radiusof the electron when the shell number is n=5 and n=200 ?
  
• A neutron with a mass of 1.68x10^-24g moves from a nuclear reactor with a velocity of 3.22 x 10^3 m/s. What is the de Broglie wavelength of the neutron?
  
• What is the pH of 10^-8M of KOH ?
  
• Calculate acid ionization constant.?
  
• Why does a reagent have to be in large stoichiometric excess in order for the reagents term in the rate law equation to be considered pseudo-zero order?
  
• #psi_A(x,0) = sqrt(1/6)phi_0(x) + sqrt(1/3)phi_1(x) + sqrt(1/2)phi_2(x)# Calculate the expectation value #<E># at any later time t=#t_1#, #phi_n# are energy eigenfunctions of the infinite potential well .Write the answer in terms of #E_0#?
  
• For which of the following is deltaH equal to deltaE(internal energy)?
  
• Help me answer this question Why is the answer Z and not Argon?
  
• The rate constant for the reaction: NO2(g)+O2(g)---->NO3(g)+O2(g) was determined over a range of 40.0 K, with the following results. Determine the activation energy for the reaction (kJ/mol) and calculate the rate constant of the reaction at 300K?
  
• Why doesn't the concentration of H3O+ decrease when you add HCl to water?
  
• Solution contain 8.3 g of nonvolatile substance dissolved in 1 mol CHCl3 has vapor pressure 511 torr the vapor pressure of pure CHCl3 at the same temp is 526 calculate the mol fraction of the solute and number of mole solute in solution ??
  
• Ammonium nitrite, #NH_4NO_2# decomposes in solution according to the reaction: #NH_4NO_2(aq)# #rarr# #N_2(g)# + #2H_2O(l)# The concentration of #NH_4^+# ion at the beginning of an experiment was 0.5 M. After 3 hrs, it was 0.432 M (Q below?)
  
• How is heat related to kinetic energy Like if we heat the particles, they gain kinetic energy... So,Why do the particles begin to vibrate and start their motion if we supply heat?
  
• Question on calculations about solubility How to calculate it ?
  
• Can some explain this using ice table?? Calculate #K_c# at this temperature. Provide your answer to two places after the decimal and without units.
  
• A box with an initial speed of #1 m/s# is moving up a ramp. The ramp has a kinetic friction coefficient of #2/3 # and an incline of #(3 pi )/8 #. How far along the ramp will the box go?
  
• Consider the titration of 50.0 mL of 0.20 M NH3 (Kb=1.8×10−5) with 0.20 M HNO3. Calculate the pH after addition of 50.0 mL of the titrant at 25 ∘C?
  
• How do you integrate #(x+2)/(x+3)#?
  
• What does infrared spectroscopy measure?
  
• What is the value of Keq?
  
• The work function (Φ) for a metal is 5.90×10-19 J. What is the longest wavelength of electromagnetic radiation that can eject an electron from the surface of a piece of the metal?
  
• What is the molarity of #53%"w/w"# #"HNO"_3#?
  
• Calculate the minimum energy ΔE = E2- E1 (eV and SI) required to excite a H -atom from ground state to its first excited state.boltman constant k= 1.38E-23JK-¹ calculate the ratio (E2 -E1)/kT when the gas is at 2000°C?
  
• How many molecules (not moles) of NH3 are produced from 3.04×10−4 g of H2?
  
• Factors that influence the Kinetic of an irreversible exothermic reaction... and temperature?
  
• What mass of methane combusted?
  
• C6H6+15O2-12CO2+6H2O+ 1562kcal if you want to obtain 125kcal of heat by reacting benzene with oxygen, how many grams of benzene must you use?
  
• The density of nickel (FCC unit cell) is 8.94 g/cc. at 20°C. What is the diameter of the atom ? (atomic weight = 59)
  
• Calculate the enthalpy change for the reaction.?
  
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