Exam III

Question 1

What is ideal gas law?

Answer 1

PV = nRT; P=pressure, V=volume, n=# of mols, T=temp in Kelvin, R=0.0821

Question 2

convert 760mmHg to torr, atm, psi, pascals

Answer 2

760 torr, 1 atm, 14.7 psi, 101,325 pascals

Question 3

Which Gas Law? For a fixed amount of a gas at constant temp, the volume is inverse to the pressure

Answer 3

Boyle’s Law

Question 4

What is Boyle’s Law?

Answer 4

P1V1 = P2V2

Question 5

Which Gas Law? The volume of a fixed amount of gas at constant pressure is directly propotional to its temp in K

Answer 5

Charle’s Law

Question 6

What is Charle’s Law?

Answer 6

V1/T1 = V2/T2

Question 7

Which Gas Law? At a fixed temp and pressure, the volume of a gas is directly proportional to the # of mols of that gas

Answer 7

Avogadro’s Law

Question 8

What is Avogadro’s Law?

Answer 8

v1/n1 = V2/n2

Question 9

Which Gas Law? Relates pressure, volume, # of mols, temp all in one equation

Answer 9

Ideal gas low

Question 10

What is General Gas Equation?

Answer 10

P1V1/T1 = P2V2/T2

Question 11

Which Gas Low? The sum of the partial pressures exerted by each individual gas is the total pressure of the system

Answer 11

Dalton’s Law of Partial Pressures

Question 12

What is Dalton’s Law of Partial Pressures?

Answer 12

Pt = P1 + P2 + P3?

Question 13

Average Kinetic Energy is?

Answer 13

directly proportional to the temp of the system

Question 14

What is Diffusion?

Answer 14

molecular movement of a gas going high consentration to lower

Question 15

What is Effusion?

Answer 15

movement of gas through an opening

Question 16

What is Graham’s Law?

Answer 16

rates of effusion of 2 different gases in inversely proportional to the square root of their molar masses

Question 17

What is Polarity?

Answer 17

the tendency for a partial charge separation to occur within a molecule, either via lack of symmetry or via differences in electronegativity

Question 18

What is intermolecular forces?

Answer 18

those in addition to bonds, that exist among different molecules

Question 19

What is intramolecular forces?

Answer 19

those forces that exist within a molecule and help determine its preferred conformation

Question 20

What is Dipole-Dipole interaction?

Answer 20

in polar compounds, the partially positive (delta+) end aligning itself with the partially negative (delta-) end of another molecule

Question 21

What is Hydrogen Bonding?

Answer 21

the electrostatic attraction between polar molecules that occurs when a H atom bound to a highly electronegative atom such as FON

Question 22

What is London Dispersion Forces?

Answer 22

The weakest intermolecular force. A temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

Question 23

What are the forces acting among molecules called?

Answer 23

cohesion

Question 24

What are the forces acting between molecules and the surface of the container called?

Answer 24

adhesion

Question 25

What is the tendency of a liquid to rise in narrow tubes or to be drawn into small openings?

Answer 25

capillary action

Question 26

What is the phase? Change between liquid and gaseous states of matter

Answer 26

Vavorization/evaporation

Question 27

What is the pressure a liquid excerts on the atmosphere?

Answer 27

vapor pressure

Question 28

What is the pressure the atmosphere excerts on the liquid?

Answer 28

atmospheric pressure

Question 29

Increase atmospheric pressure = (increase/decrease) vapor pressure = (increase/decrease) boiling point

Answer 29

decrease VP, increase BP

Question 30

Increase temp = (increase/decrease) kinetic energy = (increase/decrease) vapor pressure

Answer 30

increase KE, increase VP

Question 31

Increase surface area of liquid = (increase/decrease) molecules intencity with atomospheric pressure = (increase/decrease) evaporative rate

Answer 31

increase MI, increase ER

Question 32

What is this phase change? Solid -> Liquid -> Gas

Answer 32

melting, evaporation

Question 33

What is this phase change? Gas -> Liquid -> Solid

Answer 33

condensation, freezing

Question 34

What is this phase change? Solid -> Gas

Answer 34

sublimation

Question 35

What is this phase change? Gas -> Solid

Answer 35

deposition

Question 36

What is Heating Curves?

Answer 36

graphically represent the phase changes for a substance

Question 37

What is Phase Diagram?

Answer 37

represents the conditions supporting different states of matter for a substance

Question 38

What is tha set of contions that supports all 3 states of matter (solid, liquids, and gas)?

Answer 38

triple point

Question 39

What is Covalent Solids?

Answer 39

have a network of covalent bonds throughout the crystal unit

Question 40

What is Ionic Solids?

Answer 40

contain gaseous cations and anions hold together in a matrix

Question 41

What is crystalline solids?

Answer 41

highly regular repeating network of atoms

Question 42

What is amorphous solid?

Answer 42

no order in the network of atoms

Question 43

What is the system? Neither heat nor matter is exhanged with the surroundings

Answer 43

isolated

Question 44

What is the system? Can exchange evergy, but not matter with the surroundings

Answer 44

closed

Question 45

What is the system? Exchanges both energy and matter with the surroundings

Answer 45

open

Question 46

Processes - conducted at some temp

Answer 46

isothermal

Question 47

Processes - conducted at some pressure

Answer 47

isobaric

Question 48

Processes - not heat exchange occurs

Answer 48

adiabatic

Question 49

stored energy

Answer 49

potential

Question 50

energy in motion

Answer 50

kinetic

Question 51

Derived from molecular motion, or temp of the system, also known as enthalpy

Answer 51

termal energy

Question 52

energy released as heat

Answer 52

friction

Question 53

1 calorie = ? Joules

Answer 53

4.184

Question 54

regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes

Answer 54

Hess's Law