Answers created by Truong-Son N.

• Back to user's profile
• Next
• What are some common mistakes students make with rate law?
  
• How do summations work?
  
• How can I find valence electrons of transition metals?
  
• How do you construct a Born-Haber cycle to calculate the lattice energy of sodium chloride?
  
• When #"0.2 M"# of propionic acid dissolves in water, the #"pH"# was found to be #4.88#. Find the #K_a# of propionic acid?
  
• What is the surface area of the solid created by revolving #f(x) =e^(2-x) , x in [1,2]# around the x axis?
  
• Question #fb4a7
  
• How do you calculate half life decay?
  
• Imagine that a new polyatomic anion called "platoate" is invented. What would an acid of "platoate" be named?
  
• Can activation energy be changed by changing the temperature?
  
• Why is #"CHCl"_3# polar even though the electronegativity difference is smaller than #1.0#?
  
• Why is #"Ni"("CN")_4^(2-)# diamagnetic but #"NiCl"_4^(2-)# paramagnetic?
  
• How do I prove that the cyclic rule of partial derivatives applies to #P#, #T#, and #V#?
  
• Why is the iron KLMN configuration #2,8,14,2# and not #2,8,8,8#?
  
• How do you factor #a^4 - 8a^3 + 16^2#?
  
• A chemist heats 100.0 g of #FeSO_4 * 7H_2O# n a crucible to drive off the water. If all the water is driven off, what is the mass of the remaining salt?
  
• What are examples of compounds and non-compounds?
  
• 2x + 3/x - 2?
  
• What is the derivative of #xlogx#?
  
• How do you determine the temperature at which the reaction undergoes a thermal runaway?
  
• What are the orders of #"CV"^(+)# and #"OH"^(-)# for the reaction #"CV"^(+)(aq) + "OH"^(-)(aq) -> "CVOH"(aq)#?
  
• According to Wien's Law, if the surface temperature is increased by a factor of 2, what will happen to its peak wavelength?
  
• What is the second derivative of #x + siny = 1# in terms of #x#?
  
• What is the #lim_(xrarr1^+) x^(1/(1-x))# as x approaches 1 from the right side?
  
• The heat content of a system is equal to the enthalpy only for a system that is at constant what?
  
• What is the effective atomic number of dichlorobis(ethylenediamine)cobalt(III)?
  
• Help with these kinetics questions about reaction order with respect to one reactant #A#??
  
• Hot objects with temperatures of 10 million Kelvin give off most of their radiation in which part of the electromagnetic spectrum?
  
• A student conducting a calorimetry investigation determines a negative #DeltaH#. What does the negative value indicate about the reaction?
  
• What is the general solution for the differential equation? #(dy)/(dx) = (3x^2 + 3cosx + 4e^3x)(y^2 + 4)#
  
• What is #int_(0)^(10) x|sinx|dx#?
  
• Is #sin^2x = (sinx)^2#?
  
• How do you integrate #(x^2 + 5x - 2)/(x(x^2 - 2))#?
  
• Question #04991
  
• What is the limit of #((1)/(x))-((1)/(e^(x)-1))# as x approaches infinity?
  
• How is vapor pressure related to decreasing boiling point and the ease of boiling?
  
• What are two driving forces of chemical reactions?
  
• What is the first step in forming #"CFC"#'s from #"CF"_3"Br"#?
  
• For a reaction whose mechanism is given below with initial rate #"0.0030 M/s"#, #(a)# what is the new rate if #["A"]# is doubled, #(b)# if #["B"]# is doubled, and #(c)# if both #["A"]# and #["B"]# are multiplied by #5#?
  
• How do I determine the units of the rate constant for a zero order, first order, second order, and third order reaction?
  
• What is #int_3^oo 3/x -2/(x-2)dx#?
  
• How do I do determine which half-reaction is at the cathode and anode in an electrolysis process??
  
• How do you find the rate law for the following overall reaction, given its mechanism below? #2A + C -> D#
  
• A reaction occurs between two liquid substances in a sealed jar. What will happen to the mass of the sealed jar and is contents after the reaction occurs?
  
• What is the MO diagram of #"FeO"#?
  
• What is the maximum number of electrons that can occupy an orbital if they have different spins?
  
• Given the following graph for a reactant concentration as a function of time, estimate the instantaneous rate of reaction at #"40 s"#?
  
• Calculate the new activation energy at #37^@ "C"# if the catalyzed reaction is #200# times as fast, and the uncatalyzed activation energy was #"100 kJ/mol"#?
  
• Give real life examples of homogeneous and heterogeneous solutions?
  
• A particle is projected from the origin #(0,0)# in the #xy# plane at angle of #37^o# with the x axis with a speed of #10# #ms^-1#, its acceleration being #(-5 hati + 10 hatj)# #ms^-2#. What is the speed of the particle when the x-coordinate is again zero?
  
• How do you find the area of the surface generated by rotating the curve about the y-axis #y=cx+d, a<=x<=b#?
  
• Given the reaction: #HC_2H_3O_2(aq) + H_2O rightleftharpoons H_3O^+(aq) + C_2H_3O_2^(-)(aq)# When the reaction reaches a state of equilibrium, what happens to the concentrations of the reactants?
  
• Consider the reaction 3A + B + C ---> D + E where the rate law is defined as -D[A]/Dt=k[A]^2[B][C]?
  
• What is the order for the reaction #2"N"_2"O"_5(g) -> 4"NO"_2(g) + "O"_2(g)#?
  
• A #"1.85 g"# sample of mixture of #"CuCl"_2# and #"CuBr"_2# was dissolved in water and mixed thoroughly with a #"1.8 g"# portion of #"AgCl"#. After reaction, the solid, a mixture of #"AgCl"# and #"AgBr"#, was filtered, washed, and dried, and [ . . . ] ?
  
• What volume is produced at STP in the reaction #2"H"_2"S"(g) + 3"O"_2(g) -> 2"SO"_2(g) + 2"H"_2"O"(l)# if we start with #"200 mL H"_2"S"# and #"200 mL O"_2#?
  
• How do you calculate the dipole moment along the #"OH"# bond of water? #r_(O-H) = "0.96 Å"# and #/_HOH = 104.4776^@#, and the charge of the electron is given as #"4.80 A"#.
  
• Hot coffee in a mug cools over time and the mug warms up. How would you describe the energy in this system?
  
• The figure shows two phase diagrams, one for a pure liquid (black line) and the other for a solution made using the liquid as the solvent (red line). What does point B represent?
  
• Where do quantum numbers come from and how were they determined?
  
• Question #cb563
  
• How do you differentiate #\tan ^ { - 1} ( \cos \sqrt { x } )#?
  
• What is the arclength of #f(x)=(x-2)/(x^2+3)# on #x in [-1,0]#?
  
• What is the name of the compound that has one aluminum atom and three oxygen atoms?
  
• For the dissolution of lead(II) chloride in #"0.2 M NaCl"#, find the molar solubility at SATP? How do I do this without a #K_(sp)#?
  
• An anion-exchange column is lined with #"OH"^(-)#. A solution of #"MCl"_2# is passed through the column, and the result titrated to its equivalence point [ . . . ]. If #"2.375 g"# of #"MCl"_2# was originally dissolved, determine [ . . . ] #"M"#?
  
• What is the electron configuration of #"H"^-#?
  
• What is the mathematical equation showing that the quantity of heat absorbed by vaporizing is the same as the quantity of heat released when the vapor condenses?
  
• Help with these three questions about mass and concentrations?
  
• What is the molar concentration of methanol if the mol fraction of methanol is #0.040# at #4^@ "C"#?
  
• What is the surface area produced by rotating #f(x)=tanx-cos^2x, x in [0,pi/4]# around the x-axis?
  
• Can someone help me with questions 1, 3, and 4? As soon as possible please, I have several questions regarding the properties of equilibrium constants.
  
• For a constant-temperature, constant-volume process, what is the change in pressure caused by introducing #"3 mols"# of an additional ideal gas into a #"24-L"# contain at #25^@ "C"#?
  
• Consider a #"3 kg"# box on a flat surface. If the coefficient of static friction is #0.5#, #(a)# what is the pulling force needed to move the box, and #(b)# if one pulls at a #60^@# angle with respect to the horizontal, what force is needed instead?
  
• Why is the #"FPF"# bond angle larger than the #"BrPBr"# angle in #"PF"_3# and #"PBr"_3# respectively?
  
• What is the #"pH"# for #"0.11 M"# #"HF"# dissociating in water at #25^@ "C"#? #K_a = 7.2 xx 10^(-4)#
  
• Question #f4617
  
• Why is there an exception in the ionization energy trend in the second-row p-block elements?
  
• How would you prove that cuprous oxide is not an element?
  
• Is #H_2O# a base or acid?
  
• What is the arclength of #r=-thetasin(theta/2-(27pi)/16) -3cos(theta/2 -(11pi)/16)# on #theta in [(11pi)/8,(13pi)/8]#?
  
• Question #7bc94
  
• How do you find the derivative of #G(x)=int (e^(t^2))dt# from #[1,x]#?
  
• Question #f4f41
  
• According to Bohr's model of an atom, which of the following is/are quantized? (a) The total energy of electron is quantized. (b) Angular momentum of electron is quantized. (c) both (a) and (b). (d) None of the above.
  
• If #"14 g"# of calcium nitrate is dissolved in #"200 g"# of water, and it experiences a #70%# dissociation, what is the solution's vapor pressure if the solvent began at the normal boiling point of water? Hint: the normal boiling point occurs at 760 torr.
  
• What is the molar mass of calcium hydroxide?
  
• Explain the mechanism for the #"Pt"#-catalyzed formation of water from #"H"_2# and #"O"_2#?
  
• Can you tell from the chemical formula what the molecule looks like?
  
• If #K_c# at a certain temperature for twice the formation reaction of #"HF"(g)# in a sealed rigid #"10-L"# container is #1.0 xx 10^2#, and one starts with #"1.00 mol"# of each reactant, what are the concentrations at equilibrium for each species?
  
• What would a 0.12M solution of an acid that ionizes only slightly in solution be termed?
  
• During a phase change, what happens to the temperature of a substance?
  
• Inside a laser apparatus, the stimulation and relaxation of electrons in atoms causes many photons with the same what to be continuously emitted?
  
• What is the total enthalpy for #"C"(g) -> "C"^(4+)(g) + 4e^(-)#?
  
• What is the #%"w/v"# of #"NaOH"# if #"4.0 g"# of it was in #"500 mL"# and #"10 mL"# of it was used to get #"100 mL"#?
  
• What are Helmholtz free energy and Gibbs free energy?
  
• Is there a simple way to solve #int(x^2-1)/(x^3+x)dx#?
  
• What do the signs on an orbital represent?
  
• How do you use a Taylor polynomial to estimate #tan(x)# around #x=0# for #n=0, 1, 2#?
  
• A certain amount of rubidium iodide was dissolved in #"4.6 L"#. A #"1-L"# aliquot was extracted an diluted to #"13.9 L"# to form a #"0.65 M"# solution in water. What mass of rubidium iodide was dissolved into the original solution?
  
• Next