9. Basic Chemistry: Chemical Bonding

Choose the correct answer/s about chemical bonding?

• An ionic bond is formed when electrons are shared

  equally between identical atoms.

• Chemical bonds hold groups of atoms together.

• The difference in electronegativity values between the atoms involved in a bond length.

• A covalent bond represents the sharing of electrons by nuclei.

What factor determines the relative level of polarity of a polar covalent bond?

• Bond energy.

• Bond length.

• Electron configuration.

• Difference in electronegativity.

Which of the following molecules contain polar covalent bonds?

• Sulfur, S_8.

• Iodine monochloride, ICl.

• Hydrogen bromide, HBr.

• Fluorine, F_2.

• Water, H₂O.

When two atoms share two pairs of electrons, a ........ bond is said to exist between them.

• Ionic
• Covalent
• Metallic
• Hydrogen

Choose the correct answer/s about Lewis structure.

• Some molecules have more than one valid Lewis structure.

• Lewis structures are drawn to represent the arrangement of all electrons in a molecule.

• Lewis structure of a molecule describes how

  the atoms are arranged in space.

• The rules for drawing Lewis structures are based on the observation that nonmetal atoms tend to achieve noble gas electron configurations by sharing electrons.

Arrange the following bonds in order of increasing polarity: H-H, O-H, Cl-H, S-H, and F-H.

• F-H O-H Cl-H S-H H-H

• H-H S-H Cl-H O-H F-H

• Cl-H F-H O-H S-H H-H

• H-H S-H O-H F-H Cl-H

What kind of chemical bonding that exist in NaCl?

• polar covalent bonding.

• polar non-covalent bonding.

• ionic bonding.

• metallic bonding.

True or false? In general, a smaller atom has a smaller electronegativity.

• True

• False

If lithium and fluorine react, which has more attraction for an electron?

• Fluorine has more attraction for an electron.
• Fluorine and lithium attract electrons equally.
• Neither has attraction for an electron.
• Both have equal attraction for an electron.
• Lithium has more attraction for an electron.

Which of the following molecules contain non-polar covalent bonds?

• KBr.

• Cl₂.

• O₃.

• HF.

• P₄.