CHS 1440 Test 3

If 19.6 L of H2S(g) at 722 torr and 17°C from a natural gas source react with excess SO2(g), what mass of solid sulfur could be produced?

2H2S(g) + SO2(g) --> 3S(s) + 2H2O(g)

a. 25.0 g

b. 37.6 g

c. 50.0 g

d. 32.1 g

e. 61.2 g

b. 37.6 g

Which of these is not really true in relation to gases>

a. gases have densities similar to solids and liquids

b. gases expand to fill the volume of a container

c. gases have highly variable densities depending on conditions

d. gases mix with one another readily and thoroughly

e. gases change volume dramatically with changing temperatures

a. gases have densities similar to solids and liquids

Which substance could be used in the making of lubricants due to weaker bonding forces between layers of carbon atoms?

a. CH4

b. diamons

c. fullerene

d. graphite

e. Li3CO3

d. graphite

How many valence electrons are utilized in the ion, SO3^2-?

a. 7

b. 25

c. 8

d. 26

e. 21

d. 26

How many electrons, per silver atom, are delocalized in the sea of electrons model?

a. 9

b. 18

c. 11

d. 5

e. 2

c. 11

Based on intermolecular forces, select the molecule that is most likely to be a liquid at ordinary temperature and pressure.

a. CH3COOH

b. H2

c. O2

d. CH4

e. CH3F

c. O2

A sample of SO2 gas can be generated in the laboratory by heating ZnS with O2. If 14.5 L of STP react with excess ZnS, what volume of SO2 is generated at STP?

a. 9.67 L

b. 14.5 L

c. 22.4 L

d. 21.8 L

e. 5.22 L

a. 9.67 L

Predict the three - dimensional shape of a trichloromethane, CHCl3

a. tetrahedral

b. see-saw

c. distored tetrahedral

d. octahedral

e. bent

a. tetrahedral

Select the correct statement when comparing the properties of acetone [(CH3)2CO] with those of water (H2O)

a. water and acetone have equal vapor pressure

b. water has a higher vapor pressure

c. water has a lower boiling point, due to hydrogen bonding interactions

d. acetone has a lower vapor pressure, because it has a larger molar mass.

e. acetone has a higher vapor pressure, since it has no hydrogen bonding interactions

e. acetone has a higher vapor pressure, since it has no hydrogen bonding interactions

An experiment is designed to test a component in a natural gas processing plant. If the mole fraction of methane gas, CH4, in the natural gas mixture is 0.865, and the total pressure is 750 torr, what should be the partial of the methane gas?

a. 101 torr

b. 578 torr

c. 370 torr

d. 140 torr

e. 649 torr

e. 649 torr

Choose the substance that corresponds to a p - type semiconductor.

a. Ge doped with As

b. Si doped with Al

c. Si doped with As

d. Ge doped with P

e. Si doped with P

b. Si doped with Al

Select the correct bonding information for the diatomic nitrogen molecule.

a. N2 has three sigma bonds

b. N2 has a triple bond, two of which are pi (π) bonds

c. N2 has three pi - bonds

d. N2 has two sigma bonds and a pi - bond

e. N2 has two sigma bonds and two pi - bonds

b. N2 has a triple bond, two of which are pi (π) bonds

The normal boiling point for ethane, C2H6 (-88 °C), is lower that the normal boiling point for formaldehyde, CH2O (-19.5 °C). This can be explained by

a. larger dipole - dipole forces between C2H6 molecules

b. weaker intermolecular forces between C2H6 molecules

c. stronger hydrogen bonding interactions between C2H6 molecules

d. larger dipole - dipole forces and larger dispersion forces between C2H6 molecules

e. weaker dispersion forces between CH2O molecules

b. weaker intermolecular forces between C2H6 molecules

For a molecule having 2 bonds and two lone pairs of electrons on the central atom, what is the expected molecular geometry?

a. trigonal planar

b. T-shaped

c. triangular pyramidal

d. tetrahedral

e. bent

e. bent

Which gas will have the greatest volume at STP?

a. 1.0 g N2

b. 1.0 g O2

c. 1.0 g Ch4

d. 1.0 g H2

e. 1.0 g SO2

d. 1.0 g H2

Rank the hydrocarbons in terms of decreasing vapor pressure: C2H6, C10H22, CH4, C7H16. C22H46

a. C22H46, C10H22, C7H16, C2H6, CH4

b. C2H6, C10H22, CH4, C7H16, C22H46

c. C2H6, CH4, C7H16, C10H22, C22H46

d. C22H46, C10H22, C2H6, CH4, C7H16

e. CH4, C2H6, C7H16, C10H22, C22H46

e. CH4, C2H6, C7H16, C10H22, C22H46

How many resonance structures can be drawn for the sulfur dioxide molecule, SO2?

a. 4

b. 3

c. 1

d. 2

e. 0

d. 2

In relation to ions and ionic bonding, which is incorrect?

a. MgF2 has a larger lattice energy than NaF

b. the lattice energy of KF is larger than that of CaO

c. larger ion sizes generally contribute to weaker ionic bonds

d. the lattice energy of CaO is larger than that of NaF

e. smaller ion sizes generally contribute to stronger ionic bonds

b. the lattice energy of KF is larger than that of CaO

The following are based on the assumptions of the kinetic molecular theory. Select the one which is not necessarily true at STP.

a. gas particles are in constant, random motion

b. gas particles are infinitely small and occupy negligible volume

c. the collisions between gas particles are inelastic

d. gar particles interact with each other when they collide

e. KEavg = 1 1/2 (RT)

c. the collisions between gas particles are inelastic

In which of the following will an electron require only a very small amount of energy, or no energy, to move from the valence band to the conduction band

a. H

b. Cu

c. diamond

d. S

e. Si

b. Cu