UNIT 5 QUIZ

Classes of chemical bonds fall into three broad groups, name them.

• Ionic, Covalent, Metallic

• Polar, Non-polar, semi-polar

• Single, Double, Triple

• Sigma, Pi, Delta

Differentiate between the three types of chemical bonds.

• Positive charge, Negative charge, Neutral charge

• Strong bonds, Weak bonds, Intermediate bonds

• Unequal sharing of electrons, Equal sharing of electrons, No sharing of electrons

• Sharing of electrons, Transfer of electrons, Metallic bonding

Consider the following two molecules: Sodium chloride (NaCl) and Carbon dioxide (CO₂). Which one of these molecules contains an ionic bond and which one contains covalent bonds?

• NaCl - Covalent, CO₂ - Ionic.

• NaCl - Ionic, CO₂ - Covalent.

• NaCl - Covalent, CO₂ - Covalent.

What helps describe unequal sharing of electrons in a bond.

• Electron affinity

• Electronegativity

• Ionization energy

• Atomic radius

What is meant by the term electronegativity?

• Tendency of an atom to lose electrons

• Number of electrons in the outermost shell

• Ability of an atom to attract electrons in a chemical bond

• Ability of an atom to form bonds

comment on the polarity of the following (Polar or non-polar)

a) HCl

b)Hf

c) O2

• a) Polar,

  b) NH3 - Polar, c) Non-polar

• a) Non-polar,

  b) Non-polar,

  c) Polar

• a) Polar,

  b)Non-polar,

  c) O2 - Polar

• a) Non-polar

  b) Polar,

  c) Non-polar

When talking about atoms in a Lewis structure, what is meant by the term formal charge? Is the formal charge the same as an electron? If no, explain why.

• Formal charge is the number of valence electrons in an atom. Yes, it is the same as an electron.

• Formal charge is the charge assigned to an atom in a molecule. No, it is different from an electron count.

• Formal charge is the total number of electrons in an atom. Yes, it is the same as an electron.

• Formal charge is the charge of an ion. No, it is different from an electron.

Determine the electron configurations for the following elements.

a) Oxygen

b) Chlorine

• a) 1s2 2s2 2p6 3s2 3p4,

  b) 1s2 2s2 2p6 3s2 3p6 4s2 3d6

• a) 1s2 2s2 12p4,

  b) 1s2 2s2 2p6 3s2 3p5

• a) 1s2 2s2 2p6 3s2 3p6 4s2 3d6,

  b) 1s2 2s2 2p6 3s2 3p6

• a) 1s2 2s2 2p6 3s2 3p6,

  b) 1s2 2s2 2p6 3s2 3p6 4s2 3d6