Quiz Ch 9 - Covalent Bonding

What molecule could this be?

• BCl₃ ( boron trichloride))

• CH₄ (carbon tetrahydride)

• H₂O (water)

• CO₂ (carbon dioxide)

3 atoms around the central atom and no lone pairs on the central atom

• linear

• trigonal planar

• bent

• tetrahedral

• trigonal pyramidal

What is the molecular shape for this molecule?

Hint: Draw the Lewis dot structure for NH3.

• tetrahedral

• trigonal pyramid

• trigonal planar

• bent or angular

SiH₄ has what shape?

• square planar

• square pyramidal

• tetrahedral

• octahedral

Which formula represents a nonpolar molecule?

• HBr
• H₂S
• CBr₄
• PCl₃

Which of the following molecules is most polar?

• HF

• H₂

• HCl

• HBr

2. Which of the following molecules is the least polar?

• H − N

• H − Si

• H − O

• H − C

Bond X is?

• Ionic

• Pure covalent

• Polar covalent

• Nonpolar covalent

Electronegativity is

• measure of how much an atom wants (attracts) electrons in a chemical bond

• measure of the size of an atom

• the element name

• the number of electrons contained in an atom

NonPolar bonds are when

• Atoms share electrons equally

• Atoms share electrons unequally

• Electrons are transferred from one atom to another

• There are no electrons