Chemistry I - Exam 4

Crystalline Solids

have ordered structures

Which species has London dispersion forces as the ONLY intermolecular force?

Ar

When KBr dissolves in water, aqueous K+ and Br- ions results. The force of attraction that exists between K+ and H2O is called a(n) _______ interaction.

Ion-dipole

The intermolecular force(s) responsible for the fact that CH4 has the lowest boiling point in the set: CH4,CH3CH3,CH3CH2CH3,CH3CH2CH2CH3 is/are

London Dispersion forces

Hydrogen bonding is a special case of

dipole-dipole attractions

The predominant intermolecular force in water is

hydrogen bonding

Which of he following molecules has london forces as its only intermolecular force

CH3CH3

what types of intermolecular forces exist between CH3OH and H20

dispersion forces, dispole-dispole, and hydrogen bonding

what types of intermolecular forces exist between C2 and CCI4

dispersion forces

the phrase “like dissolves like” refers to the fact that

polar solvents dissolve polar solutes and nonpolar solvents dissolve nonpolar solutes

The _______ is are associated with the heat energy being used up to increase distance between molecules

Phase change B → C and D → E

Based on the following information, which compound has the strongest intermolecular forces?

Ethanol

The predominant intramolecular forces in KBr is

ionic bonding

diamond and graphite, two substances that differ in the arrangement of their atom but only contain the element carbon, can be referred to as

Allotropes

The heating curve shown was generated by measuring the heat flow and temperature for a solid as it was heated. The slope of the _____ segment corresponds to the heat capacity of the solid and slope of the ____ segment corresponds to the heat capacity of the liquid respectively.

AB and CD

What is the molar concentration of potassium bromide in a solution prepared by dissolving 4.57 g of potassium bromide in 597 g aqueous solution? Kbr MM= 119.02 g/mol, dwater = 1.0g/mL

0.0643 M

what is the correct sequence of the substance NaCI, H2, CO, and HCI in order of increasing boiling point

H2 < CO < HCI< NaCI

what is the amount of heat in KJ needed to evaporate 65.0 g of C2H5OH? The heat of vaporization for C2H5OH is 38.6 kJ/mol

54.5 kJ

a substance that solidifies into a random molecular arrangement is referred to as an amorphous solid

True

Molarity is defined as the

moles solute/ liters solution

what is the molar concentration of a solution which is prepared by dissolving 12.0 grams of NaCI in 240. mL of aqueous solution

0.862 M

a solution contains 11% by mass of sodium chloride. This means that

100 g of the solution contains 11 g of sodium chloride

which molecules has hydrogen bonding as the predominant intermolecular force

CH3CH2OH

when a liquid reaches a temperature at which its vapor pressure is equal to one atmosphere, the liquid has reached its ___

normal boiling point

Which of the following substances will have hydrogen bonding as one of its intermolecular forces?

D