Answers created by Truong-Son N.

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• If we know the rate constant, can't we find the reaction rate just by looking at the coefficients?
  
• Why does it look like potassium has more than 8 valence electrons in its outer shell? Isn't its KLMN configuration 2, 8, 9???
  
• If an unknown solid is either #"NaOH"# or #"Ba"("OH")_2#, and it is reacted with excess #37%"w/w"# stock #"HCl"# (#rho = "1.19 g/mL"#), can you still determine which base is the limiting reagent?
  
• How do you solve #sin^-1(x)+tan^-1(x)= pi/2#?
  
• How do you prove # (cos[theta]+tan[theta])/(sin[theta])= sec[theta]+cot[theta]#?
  
• When sinx=0, what does x equal?
  
• How do you rewrite #cos 3theta# in terms of only #costheta# and #sintheta#?
  
• How do you prove #(1+tanx)/(1+cotx)=2#?
  
• What are the products of the following reaction in methoxide in methanol?
  
• What is the optimal #"pH"# for acid hydrolysis?
  
• Why are atoms and molecules always in motion?
  
• How many sigma bonds are in benzene?
  
• Is the peptide bond easily broken? Why would this be important?
  
• In electrophilic aromatic substitution reactions, why is the the hydroxyl group an o,p-director?
  
• What is the SN2 reaction mechanism?
  
• What is the action of hydrogen gas on cyanogen?
  
• Which one of the following equilibrium reactions corresponds to the β2 constant for the complexation reaction described above? Part a) Ag+(aq) + 2Cn^-1(aq)
  
• Explain London dispersion forces with an analogy?
  
• From the Heisenberg uncertainty principle, how do you calculate Δx for an electron with Δv = 0.300 m/s?
  
• Is the Diels Alder reaction reversible?
  
• Use the following data to calculate the energy required to convert 10.0 g of liquid water at 100.0C to steam at 115.0C under a constant 1 atm pressure.?
  
• Use the following bond enthalpies to calculate the heat of reaction?
  
• How to determine the heat evolved or consumed by the reaction of 1.0 g SO2(g) with excess oxygen, with results from a Hess' Law Equation?
  
• Calculating the heat of the reaction?
  
• Is it always true that an acid or base reacts with metals to give hydrogen gas?
  
• How are more complex red-ox reactions balanced? The kind of reactions which have 3 or more reactions and multiple products?Also what do we do when more that one species is undergoing oxidation/reduction?
  
• What is the difference in energy between the lowest energy state of the hydrogen atom, and the next higher energy level (i.e. the difference in energy between the 2 lowest energy states)?
  
• How do you convert #"255 mm Hg"# to #"atm"#? What about #"620 torr"# to #"PSI"#?
  
• What is the density of carbon dioxide at STP?
  
• Assuming the volume is unchanged in a 0.5 M acetic acid/sodium acetate buffer at a starting pH of 4.76, if 1 mL of 0.1 M HCl is added, what does the pH become?
  
• Question #e09dc
  
• Why does ammonia have 4 shells that are sp3 hybridized, rather than having the s-shell for the non-bonding electron pair and the remaining 3 p-shells used for the covalent bonding with the hydrogen atoms?
  
• What is a more substituted carbon from a less substituted carbon? What does substituted mean?
  
• How do you start from the line structure, then determine the hybridization in order to figure out the structure with explicit atoms, for 1,3,4-trimethyl-1-pentene? What is the molecular formula?
  
• Question #655b9
  
• When does a hydride shift occur?
  
• Using Raoult's law... and knowing that #A# and #B# form an ideal binary mixture but #R# and #S# have negative deviation...?
  
• What allows sigma bonds to overlap?
  
• What is the order of the reaction #A -> B# if changing the concentration of #A# from #"0.05 M"# to #"0.1 M"# changes the rate from #2 xx 10^(-3) "M/s"# to #1.6 xx 10^(-2) "M/s"#?
  
• What is the name of the compound whose formula is #H_2SO_4#?
  
• Why can you calculate the total pressure of a mixture of gases by adding together the partial pressures of the component gases?
  
• If the poH of a solution is 10, what is the pH of this solution? Is this solution acidic or basic?
  
• What is the oxidation state of the iron center in #["Fe"("H"_2"O")_5"NO"]"SO"_4#?
  
• MO diagram of #"B"_2"H"_6#?
  
• How do I determine entropy change between two states if given the two temperatures and the two pressures?
  
• ¿¿¿Qué típos de soluciones el vídeo describe???
  
• What is the net ionic reaction for the acid-base reaction of #"HCl"# with #"NaNO"_3#?
  
• What is the definition of entropy?
  
• How many moles of Bromine are present in a 500 mL container at STP?
  
• For what temperature value are the celsius value and the Fahrenheit value the same?
  
• According to the Bohr model for the hydrogen atom, how much energy is necessary to excite an electron from n=1 to n=2?
  
• Is rain water heterogeneous or homogeneous?
  
• Why are high heats of vaporization usually associated with high boiling temperature?
  
• Question #d9771
  
• For a certain reaction #2A + B rightleftharpoons C + 3D#, #K_(eq) = 4.2 xx 10^3#, which of the following is true?
  
• What is the molar mass of sodium hydroxide?
  
• What is sigma bond metathesis?
  
• If the density of the gas is #"4 kg/m"^3# and its pressure is #1.2 xx 10^5 "N/m"^2#, how do I calculate the root-mean-square speed?
  
• Why is it important that the pressure inside a mass spectrometer gets low as possible?
  
• What is the name of #Ag_2O#?
  
• What is an example of a Bronsted-Lowry bases practice problem?
  
• What is the conventional ion notation? For example, how which of the following is correct?
  
• How could you figure out how many oxygens a polyatomic ion has?
  
• Prove that #(cosxcotx)/(1 - sinx) - 1 = cscx#?
  
• Circle all of the allowed sets of quantum numbers for an electron in a hydrogen atom?
  
• What would be the formula for diphosphorus pentoxide?
  
• What must the temperature, pressure, and volume units be in any gas law?
  
• How do you use VSEPR theory to draw #"C"_10"H"_5"Cl"_7#?
  
• What makes tetrahedral and octahedral transition metal complexes coloured?
  
• Compare and contrast the reactivity of alpha hydrogens on carbonyl compounds and alkenes?
  
• How do you draw the MO diagram for #"O"_2# from scratch?
  
• Why are there fractions in this chemical equation? #NH_2CH_2COOH (s) + 9/4 O_2 -> 2 CO_2 (s) + 5/2 H_2O (l) + 1/2 N_2 (g)# Thank you!?
  
• Question #f4729
  
• How do you calculate the uncertainty in velocity (in #"m"cdot"s"^(-1)#) of an electron (mass #9.11xx10^-31 kg#) under the conditions where the uncertainty in position is #4.782xx10^-3 m#?
  
• What are cresols?
  
• How do you solve the Heisenberg Uncertainty Principle?
  
• Write the Hamiltonian for the lithium atom?
  
• What is the difference between vapour pressure of a solvent and vapour pressure of pure solvent in Raoult's law?
  
• How is the electrophile generated in the nitration of benzene?
  
• How do you simplify # (cot^2 x)/(csc x +1)#?
  
• What is the projection of #< 2 , -6, 0># onto #< 5, -3, 8>#?
  
• Does the real resonance structure have a lower or higher total potential energy than each of the contributing structures?
  
• How do you expand #sum_(n=3)^7(n+4)#?
  
• How do you simplify #1/2 ln (4t^4) - ln 2#?
  
• How do you factor #7x^2 + 11x - 30 = 0#?
  
• What is the angle between #<-3,2,6 > # and #<6,1,-5> #?
  
• How do you prove # sec^2(csc^2) = sec^2 + csc^2#?
  
• If #veca = <8 ,1 ,-5 >#, #vecb = <6 ,-2 ,-8 ># and #vecc=veca-vecb#, what is the angle between #veca# and #vecc#?
  
• How do you prove #csc^2(theta)(1-cos^2(theta)=1#?
  
• When pyrrole undergoes electrophilic aromatic substitution, at which position does substitution occur?
  
• Molecular orbital theory for polyatomic molecules?
  
• What category does the word "no" fall in to? Is it a negative adverb?
  
• Why does H bind to the first Carbon, i know that H binds to the C that already has more H's attached to it. But i still dont get it because the first Carbon has only two hydrogens?
  
• Vessel A contains O2 gas at 25C and 1.0 atm. Vessel B contains CO2 gas at 10.0C and 0.75 atm. Both vessels have the same volume. Answer each of the following?
  
• Do elementary row operations change eigenvalues?
  
• What is the Integral of #sec^4 (x) tan^4 (x) dx#?
  
• What class of organic compounds results when cyclopentanone reacts with ethylamine in the presence of trace acid?
  
• How many sigma/pi bonds are in the aspirin structure?
  
• In the arrhenius equation, #k = Ae^(-E_a"/"RT)#, what is the frequency factor?
  
• Explain the mechanism of the Tishchenko reaction?
  
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