Download In Class Notes Week 11

105. Gamma hydroxybutyric acid, GHB, infamous as a "date
rape" drug, is used illicitly because of its effects on the
nervous system. The condensed molecular formula for GHB is
HO(CH2)3COOH.
(a) Write the Lewis structure for GHB.
(b) Identify the hybridization of the carbon atom in the CH2
groups and of the terminal carbon.
c) Is hydrogen bonding possible in GHB? If so, write Lewis
structures to illustrate the hydrogen bonding.
(d) Which carbon atoms are involved in sigma bonds? In pi
bonds?
(e) Which oxygen atom is involved in sigma bonds? In pi
bonds?
106. There are two compounds with the molecular formula
HN3. One is called hydrogen azide; the other is cyclotriazene.
(a) Write the Lewis structure for each compound.
(b) Designate the hybridization of each nitrogen in hydrogen
azide.
(c) What is the hybridization of each nitrogen in
cyclotriazene?
(d) How many sigma bonds are in hydrogen azide? In
cyclotriazene?
(e) How many pi bonds are in hydrogen azide? In cyclotriazene?
(f) Give approximate values for the N-to-N-to-N bond angles
in each molecule.
Chapter 10 – Gases
15. Gas pressures can be expressed in units of mm Hg, atm,
torr, and kPa. Convert these pressure values.
(a) 720 mm Hg to atm
(b) 1.25 atm to mm Hg
(c) 542 mm Hg to torr
(d) 740 mm Hg to kPa
(e) 700 kPa to atm
17. Mercury has a density of 13.96 g/cm3. A barometer is
constructed using an oil with a density of 0.75 g/cm3.
If the atmospheric pressure is 1.0 atm, what will be the
height in meters of the oil column in the barometer?
21. List the five basic concepts of the kinetic-molecular
theory. Which assumption is incorrect at very high pressures?
Which one is incorrect at low temperatures? Which
assumption is probably most nearly correct?
22. You are given two flasks of equal volume. Flask A contains
H2 at 0 °C and 1 atm pressure. Flask B contains CO2 gas at 0 °c
and 2 atm pressure.
Compare these two samples with respect to each of these
properties.
(a) Average kinetic energy per molecule
(b) Average molecular velocity
(c) Number of molecules