Answers created by Truong-Son N.

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• What is the electron configuration and oxidation state of vanadium in #"VBr"_3#?
  
• Could you help me identify the relative pronoun and the noun or pronoun to which it relates?
  
• When an adduct is formed from Diels Alder reaction of maleic anhydride and furan, what does the adduct decompose to at its melting point?
  
• The rate constant of a first order reaction is #4.60 xx 10^(-4) "s"^(-1)# at #350^@ "C"#. If the activation energy is #"104 kJ/mol"#, what is the temperature at which the rate constant is #8.80 xx 10^(-4) "s"^(-1)#?
  
• What is the Bronsted-Lowry acid and base versus Lewis?
  
• The attachment of a fluoride ion to the boron in #BF_3#, through a coordinate covalent bond, creates the #BF_4-# ion. What is the geometric shape of this ion?
  
• How do you calculate the percent composition of water?
  
• Why do we use disodium EDTA?
  
• How do you evaluate # e^( ( pi)/2 i) - e^( ( 19 pi)/12 i)# using trigonometric functions?
  
• In Heisenberg's Uncertainty Principle, is the uncertainty in the position a 2 dimensional, 3 dimensional, or 4 dimensional?
  
• What is an example of a tetrahedral bent molecule other than water?
  
• What is meant by the term 'mole' (and its unit, 'mol') in chemistry? (Hint: not a small burrowing mammal)
  
• What is an example of an alkene that would react with water to make only one possible alcohol. Why can't your alkene make two different alcohols?
  
• How might one draw atomic and molecular orbital diagrams?
  
• What opens epoxides?
  
• Which #d# orbital is specified by #Y(theta,phi) = (5/(8pi))^(1//2) (3cos^2theta - 1)#?
  
• Can changes in volume be negative in chemical reactions or ever?
  
• What is the integral of sin(x) dx from 0 to 2pi?
  
• When should you use the #cis//trans# as opposed to #"(Z)-"//"(E)-"# isomer naming scheme and vice versa?
  
• What are #(1)# the reaction mechanism for 1-hexene reacting with #"H"_2"O"# with catalytic #"H"_2"SO"_4# and #(2)# the reaction of cyclopentene with #"H"_2# in the presence of #"Ni"#?
  
• Explain Le Chatelier's principle in simple terms?
  
• How do you calculate the average kinetic energy of the #CH_4# molecules in a sample of #CH_4# gas at 253 K and at 545 K?
  
• How do I convert from the mass of #"25.9 g Mg"_3"N"_2# to the mass of #"27.7 g H"_2"O"#? The reaction is magnesium nitride reacts in water to form magnesium hydroxide and ammonia.
  
• What is the percentage of lithium in lithium carbonate #(Li_2CO_3)#?
  
• When are tetrahedral molecules polar and when are they nonpolar?
  
• Why can't the alkoxide ion deprotonate acetylene?
  
• What is the shorthand electron configuration for Al?
  
• How many #pi# bonds are in #["Ag"("CN")_2]^(-)#?
  
• I measured #"5.00 g"# copper sulfate solid and #"6.530 g"# zinc. If for this reaction #q_(rxn) = "979.72 cal"# of energy was involved, why is my percent error of the standard enthalpy of reaction for the reaction of zinc with copper sulfate so big???
  
• If a mass of #"16.26 mg"# contains #1.66 xx 10^20# atoms, what is the molar mass of that atom? If you have #"1 million"# silver atoms constituting a total of #1.79 xx 10^(-16) "g"#, what is the molar mass? #"1 amu"# #=# #1.660599 xx 10^(-24) "g"#.
  
• Out of NO+, NO2-, NO3- which has the longest NO bond and which has the shortest NO bond?
  
• Why is most-probable speed correspond to the top of the Maxwell-Boltzmann distribution curve, even though the root-mean-square speed is the highest? Why are average and root-mean-square to the right?
  
• In the modern atomic model, the electron cloud is denser in some locations than in others. What do the denser areas represent?
  
• Why is hydroboration anti-Markovnikov?
  
• Is "a lot" an adjective?
  
• What is the difference between the trans influence and trans effect on square-planar transition metal complex substitution/interchange reactions? So is the trans influence defined under the trans effect or alongside, or both?
  
• What is a sigma bond example?
  
• Why is there not an sp4 hybrid orbital?
  
• How do you balance #Ac(OH)_3(s) -> Ac_2O_3 + 3H_2O#?
  
• Is possible to prove that the Heisenberg Uncertainty Principle is incorrect by somehow doing an experiment without light, i.e. in total darkness? If such an experiment could be performed, would we be able to disprove this principle?
  
• Help me review kinetics??? I really don't get it and would appreciate a walkthrough of it!!
  
• What quadrant is the coordinate (2,4) in?
  
• When the volume _______ at constant ________ the density increases?
  
• How can the ideal gas law be made more precise?
  
• (a) How will you convert methyl bromide to dimethylamine? (b) How will you prepare propanamine from methyl chloride using suitable reactions?
  
• Why do aromatic rings absorb light?
  
• If given a starting product and end result, how do you determine which steps are used to reach the end result? How do you determine the correct order?
  
• Of these molecules, which one is an electrophile and which one is a nucleophile?
  
• How does hydrogen chloride differ from hydrochloric acid?
  
• How do electron capture detectors work?
  
• How does a basketball under high pressure compare to a basketball under low pressure?
  
• An interaction between two subunits of a protein was determined to have a delta G of -57.05 kj/mol. What is the Keq for the reaction at 25 degrees celsius?
  
• The density of #"CO"_2# at #0^@ "C"# is #"1.98 g/L"#. How many mols are found in #"88.0 L"# of #"CO"_2# at this temperature and #"1 atm"#?
  
• Is #NO^-# Paramagnetic or Diamagnetic?
  
• Which type of bonding can be found in #"As"("C"_6"H"_5)_3#?
  
• If we have #"24.9 L"# of liquid ethanol, with a density of #"789 g/L"# at a certain temperature, how many mols do we have?
  
• How do you solve the Arrhenius equation?
  
• Is the amount of #Na(OH)# with respect to amide in hydrolysis important?
  
• What happens to the atomic mass as you go down each group/family?
  
• What is diamagnetism?
  
• What tells us where we can find electrons? Why are these probability distributions the way they are? Can an electron ever stop spinning or moving?
  
• Can primary alcohols be oxidized to form either aldehydes or ketones?
  
• Why is #3^@ > 2^@ > 1^@ > "methyl"# the trend for reactivity in an #"S"_N1# reaction but #3^@ < 2^@ < 1^@ < "methyl"# for #"S"_N2# reactions?
  
• How do you write the formula of vanadium (IV) carbonate?
  
• Is #C_2^+# paramagnetic or diamagnetic? Is #C_2# paramagnetic or diamagnetic?
  
• Draw the Lewis structure of #"HXeSH"# and describe the electron and molecular geometry around the central atom according to VSEPR theory?
  
• Is #B_2# diamagnetic or paramagnetic?
  
• What is the half life decay rate formula?
  
• What is the atomic number of the yet undiscovered element in which the 8s and 8p electron energy levels fill?
  
• How do you calculate the pre-exponential factor from the Arrhenius equation?
  
• Explain why the trifluoromethyl (#CF_3#) group is meta directing in electrophilic aromatic substitution. What would you expect #CF_3# to be activating or deactivating? Why? Can some one PLEASE help me!!!!! Thanks?
  
• How come higher the value of Henry's Law constant, the lower is the solubility of a gas in a liquid?
  
• Which solution has the higher vapor pressure? #(A)# A solution that boils at #100^@ "C"# #(B)# A solution that boils at #-33^@ "C"#
  
• How do you solve the Arrhenius equation for activation energy?
  
• Is methylcyclohexane chiral?
  
• List and describe the gas laws?
  
• How do you simplify #sqrt(6889)#?
  
• What is the norm of #<1,-3,-2 >#?
  
• The gas inside of a container exerts #"84 Pa"# of pressure and is at a temperature of #"320 K"#. If the pressure in the container changes to #"64 Pa"# with no change in the container's volume, what is the new temperature of the gas?
  
• The volume of a gas is 93 mL when the temperature is 91°C. If the temperature is reduced to 0°C without changing the pressure, what is the new volume of the gas?
  
• A 5 letter word for what sodium does to bond with chlorine to form table salt??
  
• What are the sigma and pi bonds in cumulene?
  
• What are some examples of inorganic chemistry?
  
• Are there any geometric isomers of the stable octahedral complex #[Co(NH_3)_3(NO_2)_3]#? If there are, how many?
  
• Why can only two electrons occupy each orbital?
  
• Why does ideal gas law fail at times?
  
• Why is #"Sn"^"2+"# diamagnetic?
  
• What is an innocent ligand vs. a non-innocent ligand?
  
• Why don't any of the isotopes of natural iron have the atomic mass of 55.85 amu, if the number listed in the periodic table is 55.85 amu?
  
• Are the following ions diamagnetic or paramagnetic? #Cr_3^+#, #Ca_2^+#, #Na^+#, #Cr#, #Fe_3^+#
  
• How would you arrange the following amines in order of decreasing base strength?
  
• How do you write the equation of the tangent line to the graph of #y = ln(x^2)# at the point (5, ln(25))?
  
• Why does the reaction take place on the central ring of anthracene in a Diels-Alder reaction?
  
• Will the reaction #Ag + CuNO_3# occur?
  
• What does an acid + a base create?
  
• What is a benzylic carbon atom?
  
• How do you prove that the equilibrium concentrations of #"H"^(+)# and #"OH"^(-)# are #1.00 xx 10^(-7) "M"# at neutral pH using molar conductivity data at #25^@ "C"#?
  
• Why is Islam criticized in many parts of the world?
  
• How will you convert methyl bromide to dimethylamine?
  
• What is 16% of 30?
  
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