Synthesis of triphenylmethanol: 1. Start from bromobenzene to product, write chemical equations for this experiment stepwise and indicate which steps are water sensitive. 2. What is the major factor that increases by product biphenyl formation? How to remove this compound from the final product?
In: Chemistry
There are several distinct differences between IR and UV-Vis
spectroscopy. Discuss the following as they relate to:
(a) The types of interactions responsible for the
signals generated
(b) Source of radiant energy
(c) Signal detection
(d) Sample cells
(e) Sample preparation
In: Chemistry
In: Chemistry
Which solids are used to make a solid oxide fuel cell?
2. What is/are the fuels operating SOFCs?
3. What do we know about the atomic structures, i.e. lattices and
unit cells of SOFCs?
4.Where are the materials (chemicals) resources
from? Are they abundant?
5. What are potential environmental issues associated with the
resourcing and production of those SOFC components?
In: Chemistry
In: Chemistry
A beaker with 105 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 MM. A student adds 9.00 mL of a 0.460 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.
Express your answer numerically to two decimal places. Use a minus ( − ) sign if the pH has decreased.
In: Chemistry
Describe how to separate a mixture containing phenol, aniline, benzoic acid, and toluene.
In: Chemistry
1. What is the pH at the equivalence point in the titration of a 18.7 mL sample of a 0.381 M aqueous hydrocyanic acid solution with a 0.496 M aqueous sodium hydroxide solution?
pH =
2. The solubility of Ag2S is measured and found to be 7.38×10-15 g/L. Use this information to calculate a Ksp value for silver sulfide.
Ksp =
In: Chemistry
In: Chemistry
In: Chemistry
1) determine the heat of reaction from the bond enthalpies for the reaction given
H2 + Br2 >> 2 HBr
436.4 192.5 366.1
2) calculate the formal charges in the phosphate ion.
3) what elements can have "expanded octets" and how many electrons can they carry?
In: Chemistry
Imagine an alternate universe where the value of the Planck constant is 6.62607·10^8 J·s
.In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics?
1. A buckyball with a mass of 1.2 x 10-21 g, 0.7 nm wide, moving at 16. m/s.
Classical or Quantum
2. An airplane with a mass of 1.58 x 104 kg, 13.0 m long, moving at 800. km/h.
Classical or Quantum
3. A turtle with a mass of 720. g, 28. cm long, moving at 1.7 cm/s.
Classical or Quantum
4. An eyelash mite with a mass of 11.8 µg, 340 µm wide, moving at 50. µm/s.
Classical or Quantum
In: Chemistry
What are the empirical formulas of substances with the following mass percent compositions?
(a) aspirin 4.48% H, 60.00% C, 35.52% O
(b) ilmenite (a titanium-containing ore) 31.63% O, 31.56% Ti, 36.81% Fe
(c) sodium thiosulfate (photographic "fixer") 30.36% O, 29.08% Na, 40.56% S
In: Chemistry
When Iodobenzene (b.p. 188.5 oC) codistills with
water at 760 torr, the boiling point of the mixture is 98.5
oC. The vapor pressure of water at 98.5 oC is 714
torr.
What is the partial pressure of iodobenzen at
98.5oC?
Calculate the weight of the iodobezene that codistills
with each gram of water at 98.5 0C.
Calculate the weight of water needed to codistill 1.5
g idobenzene using steam distillation.
In: Chemistry
Does the molecule of Succinic acid rotate around its central c-c bond?
In: Chemistry