Answers edited by Truong-Son N.

• Back to user's profile
• Next
• How is percent yield calculated?
  
• What is the difference between an electrophile and a nucleophile?
  
• What torque would have to be applied to a rod with a length of #4 m# and a mass of #3 kg# to change its horizontal spin by a frequency of #2 Hz# over #3 s#?
  
• What does change of state mean?
  
• At approximately what pressure will water be a vapor a 0°C?
  
• How are nickel, calcium, magnesium, and antimony classified?
  
• What is the difference between oxidation number and oxidation state?
  
• How do you convert 45°C to Fahrenheit?
  
• How do you simplify #abs(-3/2) #?
  
• What is the geometry and hybridization of #"PF"_6^(-)#? What orbitals are used to hybridize?
  
• Let #vec(x)# be a vector, such that #vec(x) = (−1, 1), " and let " R(θ) = [(costheta, -sintheta), (sintheta, costheta )]#, that is Rotation Operator. For #theta=3/4pi# find #vec(y) = R(theta)vec(x)#? Make a sketch showing x, y, and θ?
  
• How do you integrate #x^2/sqrt(9-x^2) dx#?
  
• For the following reaction, find the rate law and rate constant? #2"NO"(g) + "O"_2(g) -> 2"NO"_2(g)#
  
• Given #(u^4 + 3u + 6)^(1/2)# how do you find the limit as u approaches -2?
  
• How do you start from benzene to synthesize this aldol condensation product?
  
• Describe the formation of single, double, and triple bonds by orbital overlap?
  
• How do you change pOH to pH?
  
• How are single covalent bonds made?
  
• How do you draw #(1)# 3-fluoro-4,5-dimethyl-1-heptyne and #(2)# 2-chloro-4-ethyl-1,3-cyclohexadiene?
  
• What are some examples of theoretical chemistry?
  
• Is there a direct proportionality between base strength and ionic radius for anions in aprotic solvents?
  
• Starting from oxo compounds, #("I")# how do you draw the mechanism for production of 9-iminofluorene? #("II")# What is the mechanism of reacting acetone with p-methylaniline in trace acid?
  
• What is the definition of entropy?
  
• A model train, with a mass of #3 kg#, is moving on a circular track with a radius of #2 m#. If the train's rate of revolution changes from #5/3 Hz# to #3/4 Hz#, by how much will the centripetal force applied by the tracks change by?
  
• If a gas sample has a pressure of 30.7 kPa at 0.00°C, by how much does the temperature have to decrease to lower the pressure to 28.4 kPa?
  
• What is the volume of #"0.220 mols"# of carbon monoxide gas found at STP?
  
• 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?
  
• Calculate the reaction quotient, #Q#, for mixing 100ml of 0.00028M #"Pb"("NO"_3)_2# with 200ml of 0.0012M #"NaCl"#. The #K_(sp)# for #"PbCl"_2# is #1.9 xx10^(-4)#. Does a precipitate form?
  
• What does salt do to ice?
  
• A solution has #[H^+] = 2.0 * 10^-5# #M#. How do you find the pOH of this solution?
  
• What is the pKa of #CH_3COOH# and #H_3PO_4#?
  
• What happens to the temperature of a material when it is undergoing a change of state?
  
• Why are alkenes used to make polymers?
  
• Which electron in cobalt is easiest to remove first?
  
• What is the #"pH"# for #2.5 xx 10^(-6) "M"# #"HCl"#?
  
• Next