Answers edited by Truong-Son N.

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• An object with a mass of # 3 kg# is traveling in a circular path of a radius of #2 m#. If the object's angular velocity changes from # 1 Hz# to # 8 Hz# in # 5 s#, what torque was applied to the object?
  
• In #"PbS"(s) + 4"H"_2"O"_2(aq) -> "PbSO"_4(s) + 4"H"_2"O"(l)#, what was oxidized and what was reduced?
  
• How do I make a Lineweaver-Burk (Double Reciprocal) Plot?
  
• If the length of a #21 cm# spring increases to #57 cm# when a #5 kg# weight is hanging from it, what is the spring's constant?
  
• In #"PbS"(s) + 4"H"_2"O"_2(aq) -> "PbSO"_4(s) + 4"H"_2"O"(l)#, what was oxidized and what was reduced?
  
• The movement of atoms is an example of what type of energy?
  
• What is enthalpy of hydrogenation?
  
• How do you differentiate #f(x)=tansqrtx# using the chain rule?
  
• Which has more momentum, a #5kg# object moving at #8m/s# or a #12kg# object moving at #2m/s#?
  
• Where does the maximum electron density occur for 2s and 2p orbitals in hydrogen atom?
  
• What is the empirical formula for a compound that consists of 72.2% magnesium and 27.8% nitrogen by mass?
  
• Why is PtCl4^2- square planar?
  
• Question #487bc
  
• Define the properties of an ideal gas?
  
• For a #"313 g"# sample of helium gas that cools by #41.6^@ "C"# due to being compressed by #"267 L"# at a constant external pressure of #"1 atm"#, if its molar heat capacity is #"20.8 J/mol"^@ "C"#, calculate #DeltaE#, #q#, #w#, and #DeltaH#?
  
• How many moles of oxygen are in 1 mole of #Ca(NO_3)_2#?
  
• Does CH3Cl have a plane of symmetry?
  
• What major concepts should I know for organic chemistry?
  
• Why might an oxygen dissociation curve be sigmoidal?
  
• Can ketones form hemiacetals?
  
• How can I draw sigma bonds?
  
• What is meant by the rate of a reaction?
  
• How do you normalize # (2i -3j + 4k)#?
  
• If #[H_3O^+] = 1.005 * 10^-5# M, what is the pH?
  
• An x-ray has a wavelength of 5 nanometers (#5.0 * 10^-9# m). What is the frequency of these x-rays?
  
• What is the empirical formula of N2O5?
  
• The lattice energy of CsI(s) is −604 KJ/mol, and the enthalpy of solution is 33 KJ/mol. How would you calculate the enthalpy of hydration (KJ) of 0.65 moles of CsI? Enter a numeric answer only, do not include units in your answer?
  
• Given, 2NH3 + Ag+ Ag(NH3)2+, what is the lewis acid and the lewis base in this equation?
  
• What's the unit of enthalpy?
  
• Is CH2 an alkyl group?
  
• Is a buffer supposed to keep the pH of a solution at 7?
  
• Why is acetic anhydride used in aspirin synthesis?
  
• A gamma ray has a frequency of #2.88 * 10^21# Hz. What does this mean?
  
• What is a glycosidic bond?
  
• When 2,3-dimethylhexanoic acid is treated with SOCl2/pyridine, followed by LiAl [OC(CH3)3]3H, what would be the product???? Thank you
  
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