Exam Review Flashcards
Three regions of space
trigonal planar, 120
Three regions of space, 1 LP
bent, <120
Four regions of space
tetrahedral, 109.5
Four regions of space, 1 LP
trigonal pyramidal, < 109.5
Four regions of space, 2 LP
bent, «109.5
Five regions of space
trigonal bipyramidal, 90 & 120
Five regions of space, 1 LP
seesaw, 90 & 120
Five regions of space, 2 LP
t shape, 90
Five regions of space, 3 LP
linear
Six regions of space
octahedral, 90
Six regions of space, 1 LP
square pyramidal, 90
Six regions of space, 2 LP
square planar, 90
Intermolecular forces & Types
- Btwn atoms
- Dipole-dipole
- H bonding
- LD forces
Intramolecular force
Btwn subatomic particles
Ionic Solids
- More e- given = stronger
- High pnts
- Brittle
- Unconductive as solid, conductive as liquid
Molecular/atomic Solids
- Neutral molecules w/weak intermolecular forces
- Noble gases
- Low pnts
- Poor conductors
- Variety
Network/covalent Solids
- Atoms w/covalent bonds
- Hard
- High pnts
- Nonconductors
Metallic Solids
- Malleable
- High pnts
- Conductors
Thermal Energy
KE + PE
Types of KE
- Translation
- Rotational
- Vibrational
Enthalpy (H)
Total internal nrg of a substance (even w/o change in T)
Exo and Endothermic Enthalpy
- Exo = -ive
- Endo = +ive
BDE
Nrg needed to break bonds (H = react - prod)
Strong bonds have
Low PE, high BDE
Weak bonds have
High PE, low BDE
As bond strength increases
- Needs more nrg (like 2/3 bonds)
- d btwn atoms decreases
Standard Enthalpy of Formation
- Uses standard form of element as 0KJ
- Hf = change in H for 1 mol (H = prod - react)
Ways of Measuring Rates
- Gas
- Colour
- Mass
- pH
- Conductivity
Collision Theory
Rxns only happens when entities collide at right orientation & KE
Factors that affect Rate of Reaction
- Ea
- Temp
- Bond type/strength (covalent needs more)
- C
- SA
- Catalysts
Rate law
= K [A]^m [B]^n
Reaction Mechanisms Requirements
- Steps must added to eqn
- Rate determ step = rate eqn
Characteristics of EQ
- Only macroscopi properties change
- System is closed, temp constant
- Rate F/B =
K Properties
- K always same regardless of C, except temp
- If EQ eqn reversed, K = 1/k
- When rxns +, xK