Covalent Bonding and Molecular Substances

The polarity of a bond between two elements can be best determined by

• The difference in electronegativity between the elements
• The difference in first ionization energy between the elements
• The number of electrons shared in the bond
• The difference in atomic radius between the elements

In the diagram shown, what is the total number of electrons shared in the bond between the two carbon atoms?

• 2
• 3
• 4
• 6

Which two substances are covalent compounds?

• C₆H₁₂O_{6 (s)} and KI _(s)
• KI _(s) and NaCl _(s)
• C₆H₁₂O_{6 (s)} and HCl _(g)
• NaCl _(s) and HCl _(g)

Which bond is most polar?

• H-F
• H-Cl
• H-Br
• H-I

Which of the following most likely represents the molecular geometry of water?

• A
• B
• C
• D

This molecule has______bond and is a _________molecule.

• non-polar; non-polar
• polar, polar
• polar,
  non-polar
• non-polar; polar

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-3

Is the molecule H2  polar or non-polar?

• polar
• non-polar

Which of the following statements explains why the bond between hydrogen chloride is polar covalent?

• Chlorine has a greater atomic mass than hydrogen
• Chlorine has a greater electronegativity than hydrogen
• Chlorine has a higher ionization energy than hydrogen
• Chlorine has a greater number of valence electrons than hydrogen

Hydrogen needs _____ electrons in its valence shell to be stable.

• 4
• 6
• 8
• 2

Which of the following is the correct Lewis dot structure for the molecule fluorine (F₂)?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2