Chem 2 exam 1

At the critical point,

The densities of the gas and the liquid are the same.

Boiling points increase in the order HCI > HBr> Hi because ___ contribute to the intermolecular interactions.

Dispersion forces

Which of the following compounds is capable of hydrogen bonding?

CH3CH2NHCH3

The vapor pressure of a liquid will increase if

The temperature is increased.

The solubility of any gas in a liquid can always be increased by

Increasing the pressure of the gas above the solvent.

Water forms a concave meniscus in a glass tube because

The adhesive forces between water molecules and the glass wall are larger than the cohesive forces between water molecules.

The concept "like dissolves like" explains why

I2 is more soluble in CCl4 than water.

Dipole-dipole interactions typically are not as strong as ion-dipole interactions because

Dipole-dipole interactions only involve partial charges caused by unequal sharing of electrons by atoms forming a bond.

Which alcohol should be most soluble in a nonpolar solvent such as hexane, C6H14?

CH3CH2CH2CH2CH20H

A solution is prepared by adding 1.50 mol glucose, which is not volatile, to 3.50 mol diethyl ether. What is the vapor pressure of this solution at 25°C given that the vapor pressure of pure diethyl ether is 23.8 torr?

16.7 torr

Coulomb's law states that the energy of attraction between ions depends

On the charges of both ions

What physical property is used to separate the hydrocarbon components in petroleum (crude oil)?

Boiling point

Which of the following must be true if the dissolution of an ionic solid in water is exothermic?

The hydration energy exceeds the lattice energy.

What is the molarity of a sucrose (C12H22011) solution that produces an osmotic pressure of 2.65 atm at 25°C?

0.108 M

Which statement is not correct? Determination of molar mass of an unknown sample by an osmotic pressure measurement requires that

The molar concentration of the solute in the solution is known in advance.

Which of the following compounds has the lowest melting point?

BeF2

Which statement about the vapor pressure of a liquid is not correct?

Adding a nonvolatile solute to a liquid increases the vapor pressure.

A colligative property does not depend on

The identity of the solute present.

Nylon is a

Polyamide.

In antifluorite structures

Cations are smaller than the anions, and there are two cations for every anion.

At a historic Civil War battleground, a stack of cannonballs looked like the picture below on the far left. Removing the top cannonball resulted in the middle view, and removing the next layer resulted in the view on the right. What sort of packing was used in stacking the cannonballs?

Cubic closest-packed

Which unit cell contains the least atoms?

SC

The basic building block of a polymer is called

A monomer

The center of a cubic hole is found

At the center of a simple cubic lattice.

Which type of solid is held together by relatively weak dispersion forces?

Molecular solid

Different structural forms of the elements are called

Allotropes

Polymers

are NOT made up of unomers and are very small molecules

Dimond

Dimond is an example of an allotrope

Osmosis

is the flow of fluid through a semipermeable membrane to balance the concentration of solutes in solutions on the two sides of the membrane

Vapor pressure

is affected by temperature, intermolecular forces, and presence of nonvolatile solute

Changes in boiling point/freezing point of solutions depends on

molality

Osmosis

is the flow of fluid through a semipermeable membrane to balance the concentration of solutes in solutions on the two sides of the membrane

Lattice energy is

is the energy required to separate one mole of an ionic solid into its constituent gaseous ions.

Equilibrium dialysis

is a passive, separation technique used to determine binding interactions

Functional groups like an ether

(C-O-C) or an alcohol (OH) make the molecule polar and thus increase solubility in polar solvents like water

Dipole-dipole interactions are a

intermolecular force that occurs between polar molecules possessing permanent dipoles

Hydrogen bonding

is the strongest and a specific dipole-dipole interaction