Chem 1211 Final Exam Review Questions With Correct Answers

Chem 1211 Final Exam Review Questions
With Correct Answers
They |type |of |compound |that |is |most |likely |to |contain |a |covalent |bond |is |
_______________________.

A) |one |that |is |composed |of |a |metal |form |the |far |left |of |the |periodic |table |and |a |nonmetal |
from |the |far |right |of |the |periodic |table.

B) |a |solid |metal |

C) |one |that |is |composed |of |only |nonmetals

D) |held |together |by |the |electrostatic |forces |between |oppositely |charged |ions.

E) |there |is |no |general |rule |to |predict |covalency |in |bonds. |- |CORRECT |ANSWER✔✔-C) |one |that |
is |composed |of |only |non |metals.



In |which |of |the |molecules |below |is |the |carbon-carbon |distance |the |shortest?

A) |H2C--CH2

B) |H-C---C-H

C) |H3C-CH3

D) |H2C--C--CH2

E) |H3C-CH2-CH3 |- |CORRECT |ANSWER✔✔-B) |H-C---C-H



The |Lewis |Structure |of |N2H2 |shows__________________.

A) |a |nitrogen-nitrogen |triple |bond

B) |a |nitrogen-nitrogen |single |bond |

C) |each |nitrogen |has |one |nonbonding |electron |pair

D) |each |nitrogen |has |two |nonbonding |electron |pairs

E) |each |hydrogen |has |one |nonbonding |electron |pair |- |CORRECT |ANSWER✔✔-C) |each |nitrogen |
has |one |nonbonding |electron |pair

,The |oxidation |number |of |iron |is |Fe2O3 |is |______________.

A) |-2

B) |+1

C) |+3

D) |+2

E) |-3 |- |CORRECT |ANSWER✔✔-C) |+3



The |formal |charge |on |sulfur |is |SO4-2 |is |_________, |where |the |Lewis |structure |of |the |iron |is:

A) |-2 |

B) |0

C) |+2

D) |+4

E) |-4 |- |CORRECT |ANSWER✔✔-B) |0



The |Lewis |Structrue |of |CO3-2 |iron |is |________________. |- |CORRECT |ANSWER✔✔-



A |valid |Lewis |Structure |of |_________ |cannot |be |drawn |without |violating |the |octet |rule. |

A) |NF3

B) |IF3

C) |PF3

D) |SbF3

E) |SO4-2 |- |CORRECT |ANSWER✔✔-B) |IF3



The |central |atom |in |________ |does |NOT |violate |the |octet |rule. |

A) |SF4

, B) |KrF2

C) |CF4

D) |XeF4

E) |ICl4- |- |CORRECT |ANSWER✔✔-C) |CF4



Given |the |average |bond |energies |for |C-H |and |C-Br |bonds |are |413 |and |267 |kJ/mol, |respectively,
|the |heat |of |atomization |of |bromoform |(CHBr3) |is |_________ |kJ/mol.



A) |1241

B) |689

C) |-689

D) |1378

E) |-1378 |- |CORRECT |ANSWER✔✔-A) |1241



C-H=413



C-Br=276

| * |3

| = |828



828 |+ |413 |= |1241



Of |the |bonds |C-C, |C--C, |C---C, |the |C-C |bond |is |___________.

A) |strongest/shortest

B) |strongest/longest

C) |weakest/longest

D) |weakest/shortest