Topic 4/14 Flashcards
What type of bond does not conduct electricity?
Coordinate covalent
What state do ionic compounds conduct electricity?
Liquid
How many pi and sigma bonds in a triple bond
2 and 1
What is coordinate covalent
Bonding electrons only come from one atom
What type of bond isnot soluable in water
Covalent because it is a polar solvent
Do ionic compounds have resonance structures
No
Bond angle of bent (2 domains and two lone pair of electrons)
104.5
Bond angle of tetrahedral
109.5
Bond angle of trigonal pyrmidal (3 domains and one lone pair of electrons)
106.7
Bond angle of trigonal bipyrmidal (5 domains) and octahedral
90
What are allotropes
Different forms of an element in the same state
Structure of diamond
Tetrahedral, strong covalent so poor electrical conductor
Structure of silicon and silicon dioxide
1) Tetrahedral
2) also tetrahedral but each silicon bonded to 4 oxygens
Structure of graphite
Sheets of hexagonal rings and each sheet held together by LDF so they can slide
Each carbon atom has one delocalized electron so conduct electricity
Graphene
Single layers of graphite, trigonal planar, high strength and good electrical conductor and very reactive
Fullerene C60
20 6 carbon rings and 12 5 carbon rings. Delocalized electron but cannot jump from fullerene to fullerne
What is the dipole in polar and non polar
Polar have net dipole
Non polar dipoles cancel each other out
What is an alloy and name two examples
Two metals or non metal ike carbon mixed in molten. Brass and stainless steal
Formal charge
Charge an atom would have if all atoms in the molecule had the same electronegativity
FC = V - (1/2B + NB)
Calculate FC for each molecule, most perferred has negative number over most electronegative element
Bond angle of square pyridmidal 5 bonding domains and one lone pair
less than 90
Where are delocalized electrons present? Why do they give greater stablotu
In covalent bonds with resonance structures. Charge is spread out so less attractive to pos nucleus
What is the wavelength needed to dissociate oxygen and ozone?
Divide bond enthalpy of oxygen or ozone by avrogadros constnat (energy to break one bond)
Find lambda (wavelength) and convert to nanometers (lambda = (hc)/E
Convert o nanometers
What is sp3, sp2 and sp hybdridization
no multiple bonds, 1 double bond, 2 double or 1 triple bond
Which molecules would form a coordinate covalent bond?
One has to have a lone pair of electrons and other at least one lone pair
Bond molecular geometry and angle in ozone
Bent and 116
Nitrogen monoxide catalyses décomposition of ozone
RNO + O3 = RNO2 + O2
RNO2 + O3 = RNO + 2O2
Define resonance structure
More than one possible positon for pi bond
Are ionic or covalent structures higher melting
ionic bc covalent weak imf
bonds BETWEEN compounds are imf whereas covalent bonds IN compounds
Describe metallic bonding and how it contributes to electrical conductivity (3)
Electrostatic attraction between lattice of cations and sea of delocalized electrons, mobile electrons responsible for conductivity
Molecular geometry of see saw
4 domains and 1 lone pair of electrons
What is preferred for formal charge?
Formal charges closest to zero on each atom
Why is aluminum malleable?
Layers of cations slide over each other when metal is malleable without breaking bonds because of delocalized electrons.
