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21 Cards in this Set

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Unit 6

ch 9

How many lone pairs of electrons are on the As atom in AsCl3?


1

In the best Lewis structure for NO +, what is the formal charge on the N atom?


0

Which of the following processes are endothermic?


the reaction associated with the ionization energy of potassium.


Use the bond energies provided to estimate ΔH°rxn for the reaction below.

C2H4(g) + H2(g) → C2H6(g) ΔH°rxn = ?
Bond Bond Energy (kJ/mol)
C-C 347
C-H 414
C=C 611
C≡C 837
H-H 436

-128 kJ

Use Lewis theory to determine the chemical formula for the compound formed between Al and O.


Al2O3

Which of the following reactions is associated with the lattice energy of CaS (ΔH°latt)?


Ca2(g) + S2(g) → CaS(s)

Place the following in order of decreasing magnitude of lattice energy.

NaF RbBr KCl

NaF > KCl > RbBr

Choose the compound below that should have the highest melting point according to the ionic bonding model.


AlN

Give the complete electronic configuration for S2-.


1s22s22p63s23p6


Identify the compound with metallic bonding.



Li

Identify the shortest bond.


triple covalent bond


Place the following elements in order of increasing electronegativity.

Sr N Na

Sr < Na < N

Which molecule or compound below contains a pure covalent bond?


Cl2

Choose the best Lewis structure for BeF2.


Give the number of valence electrons for ICl5.


42

Choose the best Lewis structure for SO42.


Draw the Lewis structure for CO32- including any valid resonance structures. Which of the following statements is TRUE?


The CO32- ion contains two C-O single bonds and one C=O double bond.


Draw the best Lewis structure for the free radical, NO2. What is the formal charge on the N?


+1

Which compound has the highest carbon-carbon bond strength?


HCCH

Place the following in order of increasing bond length.

NO2 NO3 NO

NO < NO2 < NO3