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intermolecular forces

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Chemistry

159 Terms

1

intermolecular forces

forces between separate particles

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2

london forces

IM forces due to temporarily induced dipoles

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3

dipole dipole

IM forces due to permanently induced dipole

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4

hydrogen bonding

a special very strong dipole force due to the attraction of a ‘special H’ to an ‘X atom’, includes NOF as they are more EN

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5

viscosity

measure of flow resistance

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6

surface tension

measure of energy needed to increase surface area

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7

constant

how does temperature behave during a phase change

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8

Hfus and Hvap

how do you determine Hsublimation?

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9

melt, evaporate, sublime

endothermic processes (3)

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10

deposit, freeze, condense

exothermic processes (3)

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11

vapor pressure

pressure of a gas that forms above a liquid or solid

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12

always goes up (VP)

as T goes up, VP __

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13

goes down (VP)

as IM goes up, VP __

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14

boiling point

temperature at which VP of a substance = external pressure

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15

Clausius Clapeyron

equation that gives the VP/ T curve and values of Hvap and Hfus

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16

q= h x amount

equation during a phase change (think heating/cooling curve)

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17

critical point

temperature and pressure above which there is no distinction between liquid and gas

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18

triple point

where all three states of matter exist simultaneously

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19

amorphous solid

solid without a set 3D repeating pattern

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20

crystalline solid

solid with a set 3D repeating pattern

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21

ionic solid

solid made of ions

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22

metallic solid

solid made of metal

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23

covalent network solid

a covalent solid with no discrete molecules, “hard”, high melting point

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24

molecular solid

a covalent solid, low melting point, made up of C,H, O

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25

1/2

fraction representing a face of a square

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26

1/4

fraction representing the edge of a square

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27

1/8

fraction representing the corner of a square

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28

4

how many atoms in a face centered cube

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29

2

how many atoms in a body centered cube

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30

1

how many atoms in a primitive cube

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31

fcc

cubic closest packing is exactly equal to

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32

2 per atom

how many tetrahedral holes are there

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33

1 per atom

how many octahedral holes are there

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34

solubility

maximum amount of solute that can dissolve in a given amount of solvent at a set temperature

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35

saturated solution

solution that cannot dissolve more solute

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36

unsaturated solution

can dissolve more solute

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37

supersaturated solution

an unstable condition in which a solution has more solute dissolved than the solubility limit allows

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38

solubility increases always

how does a rise in pressure affect gas solubility

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39

Cgas = k x Pgas

Henry’s Law

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40

solubility decreases always

how does a rise in temperature affect gas solubility

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41

no effect

how does a rise in pressure affect solid/liquid solubility

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42

usually goes up

how does a rise in temperature affect solid/liquid solubility

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43

mol A/ mol solution

units of mole fraction

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44

mol A/ L solution

units of M

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45

mol A/ kg solvent

units of m

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46

colligative properties

properties of solutions that depend only on the number of solute particles

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47

vapor pressure lowering

as concentration of solute increases, VP goes down

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48

Psolvent = Xsolvent x Psolvent

Raoult’s Law

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49

boiling point elevation

as solution concentration goes up, BP goes up

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50

freezing point depression

as solute concentration goes up, freezing point goes down

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51

multiply number of ions by M or m value

how to determine Meff or meff?

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52

pi = Meff x R x T

osmosis / osmolarity eq

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53

g/ mol

units of molar mass

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54

colloids

a dispersion of a substance in a medium such that the size of dispersed particles is 5nm- 1000 nm

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55

tyndall effect

name of the effect that causes colloids to scatter light

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56

solution

homogeneous, clear, molecule or ion, do not settle, cannot filter, does not scatter light

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57

colloid

heterogeneous, clear, 5nm-1000nm, does not settle, cannot filter, scatters light

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58

suspension

heterogeneous, >1000 nm, cloudy, can filter, settles over time

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59

always goes up

as temperature goes up, reaction rate

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60

usually goes up

as concentration of reactants increases, reaction rate

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61

exponent

how do you determine the order of a reaction

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62

sum of exponents

overall reaction order is determined by

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63

M/ sec

units of k for a zero order rate law

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64

1/sec

units of k for a first order rate law

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65

1/ M (sec)

units of k for a second order rate law

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66

A = -kt + Ao

equation for a zero order rate law

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67

ln A = - kt + ln Ao

equation for a first order rate law

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68

1/A = kt + 1/ Ao

equation for a second order rate law

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69

because M is not in the units of k

why can you use proportional values in a first order rate law

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70

half life

length of time required for only 1/2 amount to remain (first order!)

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71

kt1/2 = ln 2

half life equation used in first order rates

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72

collision theory

states that rate is proportional to rate of collisions, reactants must hit in proper directions, and particles must hit with enough energy to convert products

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73

lower Ea

why are exothermic reactions faster than endothermic ones

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74

ln (k2/ k1) = -Ea/ R (1/T2 - 1/T1)

Arrhenius equation (R= 8.314 J/mol k )

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75

the slowest step

what is the rate determining step

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76

catalyst

a substance added to a reaction that is not a reactant or product, alters the mechanism for a lower Ea, present at start of mechanism and reforms at end

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77

intermediate

an unstable molecule that formed early and is used later

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78

H+ donator

bronsted lowry acid

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79

H+ receiver

bronstead lowry base

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80

amphoteric

a substance that can either be an acid or base depending on partner (Ex. H2O)

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81

pKw (14)

pH + pOH =

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82

-log OH-

pOH=

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83

-log H+

pH=

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84

Kw

[H+] x [OH-] =

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85

1.0 x 10^-14

the value of Kw is

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86

digits to the right of the decimal

how do sig figs work for logs in pH/pOH values

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87

stronger

what does a large ka tell you about a weak acid or base

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88

Kw

Ka x Kb =

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89

the weaker the conjugate base

the stronger the conjugate acid,

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90

pKw

pKa + pKb =

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91

-log Ka

pKa =

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92

smaller

more acidic, larger Ka, ____ pKA

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93

HX

binary acid

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94

horizontal: more acidic is more EN

vertical: more acidic is larger

trend for determining binary acid strength

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95

HXO

oxoacids

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96
  1. more Os, more acidic

  2. more EN X, more acidic

trend for determining oxoacid strength

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97

Ka1 > Ka2

polyprotic acid series

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98

buffer

solution that resists pH change, a mixture of a weak acid and its conjugate base (or a reaction that an result in such mixture)

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99

pH = pKa

when [HA] = [A-], then

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100

Henderson Hasselbach (buffers)

pH = pKa + log (weak base conc)/ (weak acid conc)

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