Final Exam gen chem 2

Question 1

Substances with a low VP have a little tendency to change what ?

Answer 1

change from liquid to gas

Question 2

Substance with low VP have what kind of particle interactions and what else?

Answer 2

strong p-p interactions and/or high avg. molecular mass

Question 3

What kind of substances have hgher heats of vaporization, higher BP, and greater surface tension?

Answer 3

strong p-p interactions and/or high avg. molecular mass substances

Question 4

Large values of VP indicates what kinds of substances

Answer 4

substances with low avg molecular mass and/or very lil interaction among the particles

Question 5

Substances with lower heats of vaporization, lower BP, and less surface tension have

Answer 5

Large values of VP

Question 6

lighter gases will escape

Answer 6

first

Question 7

As pure liquids cools undisturbed in a clean contaner, the temp will

Answer 7

dip briefly below the melting point of the solid

Question 8

When solid crystals form, the temp will

Answer 8

increase to the melting point of the solid where it will remain until all the liquid has finally been converted to a solid

Question 9

A particular solid is soft, a poor conductor of heat and electricity, and has a low melting point.
Generally, such a solid is classified as

Answer 9

molecular solid

Question 10

Ionic Solid structure

Answer 10

crystalline

Question 11

Covalent Solid structure

Answer 11

amorphous or crystalline

Question 12

Network covalent structure

Answer 12

amorphous or crystalline

Question 13

Metallic structure

Answer 13

crystalline

Question 14

Ionic solid expected conductivity of solid

Answer 14

low

Question 15

Ionic solid expected conductivity of solid fused

Answer 15

high

Question 16

Network covalent and Covalent solid expected conductivity of solid

Answer 16

low

Question 17

Network covalent and Covalent solid expected conductivity of solid fused

Answer 17

low

Question 18

Metallic expected conductivity of solid

Answer 18

high

Question 19

Metallic expected conductivity of solid fused

Answer 19

high

Question 20

Carbon dioxide, CO2, in the form of dry ice would be classified as a

Answer 20

molecular solid

Question 21

The melting point of an impure compound is generally

Answer 21

lower than that of the pure solid.

Question 22

What is the vapor pressure of a solution with a

benzene to octane molar ratio of 2:1?

Answer 22

320 mmHg

Question 23

What do phase diagrams demonstrate ?

Answer 23

Phase diagrams show the

temperature/pressure relationships among the three states.

Question 24

What physical properties of solids are looked at?

Answer 24

bonding, crystal shapes, and solubility rules

Question 25

For liquids, what phys props are looked at?

Answer 25

miscibility and VP

Question 26

Physical props of gases

Answer 26

Math relationship such as ideal gas laws

Question 27

Solutions props

Answer 27

units of concentration, preparation and dilution, and properties asso’d w/ # of solute particles dissolved

Question 28

Normal melting point is

Answer 28

the temp at which the solid and liquid phase are in equilibrium at standard atmo pressure, 760 mmHg

Question 29

How are diamonds formed chemically speaking?

Answer 29

covalently bonded carbon atoms; network of substances that do not form cubic crystalline patterns, and doesn’t conduct electricity either when solid or fused

Question 30

Gibbs Free Energy change is what?

Answer 30

The measure of thermodynamic driving force

Question 31

Gibbs free energy does not tell us what?

Answer 31

the energy terrain in moving from reactants to products, but rxn dynamics/kinetics/ rates of rxn do

Question 32

Rate of rxn is based on what factors that lead to their products?

Answer 32

Collisions, attractive interactions, repulsive interactions, bond breaking, and bond making