Compounds and Molecules

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AP Chemistry › Compounds and Molecules

Questions 1 - 10

Which of the following compounds contains the most π bonds?

CO2

H2O

CH4

NH3

C2H6

Explanation

π bonds occur when there is greater than a single bond (double or triple bond). The only compound listed with double bonds or greater is CO2, meaning it is the one that contains the most π bonds.

How many lone pairs of electrons exist on the following molecule?

BF3

Explanation

.. ..

:F — B — F: Boron can have a violated octet (6 e-) and each F has 3 lone pairs

.. | .. for a total of 9 pairs of unpaired electrons

:F:

Which of the following statements best describes ionic compounds?

3-D arrays of charged particles

Formed when molecules share electrons

Neutral particles that donate electrons

Malleable compounds that lack structural stability

Explanation

The definition of ionic compounds are three-dimensional arrays of atoms held together by strong ionic bonds. Ions are charged particles that have either gained or lost a certain number of electrons. They have great crystalline strength because of the strong electrostatic forces between the ions.

Which of the following compounds contains the most π bonds?

CO2

H2O

CH4

NH3

C2H6

Explanation

π bonds occur when there is greater than a single bond (double or triple bond). The only compound listed with double bonds or greater is CO2, meaning it is the one that contains the most π bonds.

Which of the following compounds contains the most π bonds?

CO2

H2O

CH4

NH3

C2H6

Explanation

π bonds occur when there is greater than a single bond (double or triple bond). The only compound listed with double bonds or greater is CO2, meaning it is the one that contains the most π bonds.

How many lone pairs of electrons exist on the following molecule?

BF3