Email: support@essaywriterpros.com
Call Us: US - +1 845 478 5244 | UK - +44 20 7193 7850 | AUS - +61 2 8005 4826

The sulfur atom in sulfur hexafluoride

Directions on actual Exam: The exam consists of 2 sections (Chemical Bonding and Geometry and IMFs. Each multiple choice question is worth 4.33 points. You are allowed to use a scientific (nonprogrammable) calculator, periodic table, and VSEPR Theory Table.

Useful information:

ΔH°rxn = Σn×D(bonds broken) – Σn×D(bonds formed)

where Σn represents the sum of the moles of a particular type of bond

D represents bond energy per mole of bond

Chemical Bonding and Geometry

1.The Lewis dot symbol for the calcium ion is
A)2+
B)Ca
C)2+
D)Ca2+
E)Ca
2.The electron dot structure for AsCl3 molecule shows
A)a total of 84 electron dots
B)three single bonds and 10 lone pairs
C)two single bonds, one double bond, and 9 lone pairs
D)one single bond, two double bonds, and 8 lone pairs
E)three single bonds and one lone pair
3.The correct Lewis structure for CO2 is: C

O

O

A)

O

O

B)

O

O

C)

O

O

D)

O

4.Which of the following Lewis structures is incorrect?
A)
B)
C)
D)
E)
5.How many covalent bonds will be formed by bromine in BrO3– for the dot structure that expands the octet to minimize formal charge and places negative formal charges on only the most electronegative atom(s). The Pauling electronegativity values are:Br = 2.8; O = 3.5
A)3
B)4
C)5
D)6
E)7
6.Estimate the enthalpy change for the reaction 2CO + O2  2CO2 given the following bond energies.BE(CO) = 1074 kJ/molBE(O=O) = 499 kJ/molBE(C=O) = 802 kJ/mol
A)+2380 kJ/mol
B)+744 kJ/mol
C)+1949 kJ/mol
D)–561 kJ/mol
E)–744 kJ/mol