Download 1 Naming compounds 2 Light and matter

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Naming compounds
Provide the systematic name of the following compounds:
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1.
Fe2 (SO4 )3 :
2.
Cl2 O7 :
3.
HNO2 :
Light and matter
a Find the wavelength of an electron with a velocity of 6.87 ×106 m/s.
Answer:
b An instrument detects a light packet consisting of 2580 photons of light with a wavelength of
425 nm. What is the total energy of the light packet that is detected?
Answer:
c One photon of the light described in part (b) is absorbed by a hydrogen atom in the ground
state, exciting an electron. To which energy level is it excited?
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Periodicity
a Rank the following compounds from smallest to largest size: F− , Be2+ , Li+
Answer:
b Rank the following atoms from smallest to largest ionization energy: Sn, C, Ge
Answer:
c Rank the metals M = Cs, Li and K from smallest to largest reactivity with H2 :
2M (s) + H2 (g) → 2M H(s)
Answer:
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Lewis Structures and Formal Charge
For each of the following compounds, draw the most stable Lewis structure and indicate the formal
charge on each atom.
a BF3 NH3
b ICl−
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c SCO
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VSEPR theory
a For the following molecule, describe the electron geometry and the molecular geometry. State
the ideal bond angles, and describe any deviations.
NF3
Electron geometry
Molecular geometry:
Bond angles and deviations:
b For the following molecule, give the steric number and the coordination number. Describe
the electron geometry and the molecular geometry.
BrCl5
Steric number:
Coordination number:
Electron geometry
Molecular geometry:
c Rank the following molecules from largest to smallest F-A-F bond angles
NF3 , BF3 , OF2
Answer:
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Valence bond theory
a Give the hybridization for the central atom in this molecule.
COCl2
Answer:
b Give the hybridization for the circled atoms. Write ”unhybridized” if an atom is not hybridized.
i:
ii:
ii:
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Molecular orbital theory
a Fill in the molecular orbital diagram for CN− . Label all the orbitals and show where the
electrons go in the atomic and molecular orbitals.
b What is the bond order for the species in part a?
Answer:
c Is the species in part a paramagnetic or diamagnetic?
Answer:
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Empirical formula
A white solid is found to have the following percentages upon analysis:
40.00% C
53.29% O
6.71% H
The compound has a molar mass of 180.16 g/mol. Give the empirical and molecular formula of
this compound.
Empirical formula:
Molecular formula:
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Intermolecular interactions and states of matter
a List all the intermolecular forces that exist in a solution of sodium chloride dissolved in water.
b Draw a hydrogen bond between any two molecules that can form a hydrogen bond.
c Describe the difference between a metal and an ionic solid in terms of the electronic properties.
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