Learning Modules 19-24

What is the correct order of increasing electronegativity in the following group of elements?

• C<N<O

• C<O<N

• O<N<C

• N<C<O

Which compound in the following ionic substances has the most exothermic lattice energy?

• LiI

• LiCl

• LiF

• LiBr

Tags

NGSS.HS-PS2-4

Which of these elements has the greatest attraction for electrons in a covalent bond?

• Se

• As

• Br

• Kr

Which of the following is the correct Lewis structure of sodium fluoride (NaF)?

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• 
• 
• 

Tags

NGSS.HS-PS1-1

How many resonance forms are possible for the formate ion? Formate ion is CHOO−.

• 2

• 4

• 1

• 3

Draw the Lewis structure for BeCl2. (Hint: Beryllium atoms do not follow the octet rule.)

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• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The electron geometry of NH₃ (ammonia) is.

• bent

• linear

• tetrahedral

• trigonal planar

Which of the following does NOT have an angular shape?

• ClO₂^-

• S₃^2-

• HOCl

• N₃^-

Which of the following statements about the polarity of a molecule is false.

• Unequal sharing of bonding electron pairs is what leads to polar bonds within a
  molecule.

• Polar molecules must have a net dipole moment.

• Lone (unshared) pairs of electrons on the central atom play an important role in
  influencing polarity.

• A perfectly linear molecule will always be a polar molecule.