Answers created by Professor Sam

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• Question #522dd
  
• Question #6fa5d
  
• Using the Pka' Values for glutamic acid (pk1= 2.19, pk2= 9.67, pkR= 4.25) indicate the ionic form which predominates at: a) pH 1.0 b)pH 7.0 c) pH13 d) What is the net charge of the predominant form at each of these pH's?
  
• How were the shapes of s, p, d, and f orbitals determined? How did they get their names of s, p, d, and f?
  
• Show that lim x->a (x^3/8-a^3/8)/(x^5/3-a^5/3)?
  
• Question #277d6
  
• Organic Chemistry Predict the product(s)?
  
• #lim_(x->pi/2)(sinx)^(1/sin(2x)) = #?
  
• When 1,3 butadiene is treated with HBr in the presence of peroxides and light at very low temperatures two major products are produced how do you draw the 2 resonance structures for the intermediate radical and the final products?
  
• Question #9d462
  
• Question #2f5d1
  
• Question #567d4
  
• Question #933f2
  
• Question #9d1db
  
• Question #4d7d2
  
• Question #95007
  
• What is the solubility of #AgBr# in a solution of #AgBr# and #AgSCN#? Given #rarr# #K_("sp AgSCN") =10^(-12)# #K_("sp AgBr")=5xx10^(-13)# Thank you:)
  
• Question #c209b
  
• Question #b9657
  
• Question #b9657
  
• What are the reactions for amines and amides?
  
• What are the reactions for amines and amides?
  
• Question #99ec0
  
• Question #defa1
  
• Question #c6802
  
• For the nucleophilic aromatic substitution (NAS) reaction of 1-chloro-2,4-dinitrobenzene with methoxide in methanol, what does the intermediate look like?
  
• Question #b5582
  
• Question #2927d
  
• How would you explain the electrophilic aromatic substitution with a diagram of a reaction mechanism?
  
• Question #bace7
  
• Question #0f057
  
• Question #04f3c
  
• Question #d97c6
  
• Question #346a8
  
• Question #3dd79
  
• Question #68518
  
• How many unpaired electrons are in a copper atom?
  
• A photon having #lambda = 854*10^(-10) m# causes the ionization of a nitrogen atom. Give the I.E. per mole of nitrogen in KJ?
  
• Despite the large difference in electronegativity between #"Si"# and #"F"#, #"SiF"_4# has a boiling point lower than that of #"NH"_3# (#-86^@ "C"#, vs. #-33^@ "C"#). Why is that? Could it be due to the symmetry? Hydrogen-bonding?
  
• What is the maximum number of electrons that can occupy the #l = 4# subshell? What are the possible sets of 4 quantum numbers for an electron in #n = 4# orbitals?
  
• What temperature range are most elements on the periodic table liquids and how many would be liquids?
  
• Question #edab3
  
• How do increases in temperature affect the density of ocean water?
  
• Why is the modern-day quantum model of the atom better than John Dalson's model?
  
• How is the wave speed of a string the same as calculating the speed using kinematics?
  
• Which is a better Lewis acid, #"AlCl"_3# or #"BCl"_3#?
  
• Question #dda99
  
• What is the concentration of hydrogen ions in a solution of pH = 4.0?
  
• Question #183d5
  
• What are the orders of #"CV"^(+)# and #"OH"^(-)# for the reaction #"CV"^(+)(aq) + "OH"^(-)(aq) -> "CVOH"(aq)#?
  
• Sea water contains #65 xx10^-3# #"g/L"# of bromide ions. If all the bromide ions are converted to produce #Br_2#,how much sea water is needed to prepare 1 kg of #Br_2#? please tell the method.
  
• what is the difference between the reactivity and abundance of elements in Group 3A through Group 8A?
  
• Question #a7e3f
  
• What is the period of a pendulum near Earth's surface that is 130 cm long?
  
• Question #6e25b
  
• How do you solve #-x-3y= 15# and #2x+7y= -36# using substitution?
  
• Question #31c81
  
• Question #49a06
  
• How do you solve #2x ^ { 2} - 25x = 0#?
  
• How do you solve #\frac { 4m + 7} { m + 10} = \frac { m } { 2} + \frac { 11} { 2m + 20}#?
  
• How do you solve #6 + 2(3j - 2) = 4(1 + j) #?
  
• Why is Osmium with atomic number 76 the densest element and twice a dense as lead with atomic number 82?
  
• Question #80a54
  
• What is the kinetic energy for one electron whose wavelength is #"650 nm"#? Its rest mass is #9.109 xx 10^(-31) "kg"#.
  
• Question #5b2a9
  
• Question #287c9
  
• Question #8711a
  
• How do you convert 32° Fahrenheit to Celsius?
  
• How much heat is released when 2.00 kg of aluminum solidifies? How many kJ is this?
  
• Question #bbed8
  
• 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?
  
• 0.2 mole of A and 0.4 mile of B were reacted at a certain temperature and allowed to come to equilibrium . A+B---2AB The equilibrium mixture contained 0.1 mole of A, find Kc if volume of the container was 2 dm^3?
  
• Question #8b42e
  
• Question #0d50a
  
• How much heat is absorbed by a 2000 kg granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C?
  
• Question #3ca57
  
• Question #e954f
  
• Question #6cd6a
  
• Balance this reaction using ion electron method in shortest way possible . but must be clear .. #Fe^(2+)+MnO_4^(-)+H^(+) -> Fe^(3+)+Mn^(2+)+H_2O# ?
  
• A weightlifter carefully lowers a 150 kg mass from a height of 1.5 m to the floor in 5 seconds. How much power is used?
  
• A jogger runs in a straight line with an average velocity of 4.7 m/s for 3.3 min, and then with an average velocity of 5.8 m/s for 4.4 min. What is her average velocity?
  
• An object travels North at #6 m/s# for #4 s# and then travels South at #3 m/s# for #5 s#. What are the object's average speed and velocity?
  
• A desk is 3.35 m below an 1850-lm incandescent lamp. What is the illumination on the desktop?
  
• An #8 L# container holds #8 # mol and #9 # mol of gasses A and B, respectively. Every two molecules of gas B bind to one molecule of gas A and the reaction raises the temperature from #370^oK# to #425 ^oK#. How much does the pressure change by?
  
• Given the following data, what is the enthalpy associated with the given equation? ##
  
• An object is thrown vertically from a height of #2 m# at #2 m/s#. How long will it take for the object to hit the ground?
  
• How many joules of potential energy does a 1-kg book gain when it is elevated 4 m? When it is elevated 8 m?
  
• What is the moment of inertia of a pendulum with a mass of #7 kg# that is #5 m# from the pivot?
  
• Question #8f73c
  
• Question #8c957
  
• Question #b773e
  
• How do you find the E_cell given standard E_cell, Molarity, and the chemical reaction equation?
  
• Question #70b01
  
• CsBr crystallises in a body-centred cubic (bcc) lattice. The unit cell lengt is 436.6pm. Given that the atomic mass of Cs= 133u and that of Br=80u. What will be the density of CsBr? a) 0.425g/cm^3 b) 8.25g/cm^3 c) 42.5g/cm^3 d) 4.25g/cm^3
  
• Question #593b2
  
• If you did not add sugar, would the ice cream freeze faster or slower? Why?
  
• What will be the pH of the solution that results from the addition of 20mL of 0.01M Ca(OH)2 to 30mL of 0.01M HCl?
  
• Question #ae5d8
  
• A positive Seliwanoff's test is obtained with? A] Glucose B] Fructose C] Galactose D] Mannose
  
• Question #9b0c6
  
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