CHEM 219 - Module 1 Exam Questions with Correct Answers Latest Update 2025-2026
Name 5 common elements found in organic compounds besides carbon. - Answers Hydrogen,
Oxygen, Nitrogen, Sulfur, Halogens.
What unique property allows carbon to form so many compounds? - Answers Catenation —
carbon's ability to bond with other carbon atoms.
What structures can carbon form? - Answers Chains or rings, with single, double, or triple bonds.
Define an organic - Answers A covalently bonded compound containing carbon, excluding
carbonates and oxides.
Why are there more organic than inorganic compounds? - Answers Carbon's catenation and
ability to bond with many other elements create structural diversity.
What does the group number of an element tell you? - Answers The number of valence
electrons for main group elements.
What are lone pairs? - Answers Paired electrons in the valence shell that are not involved in
bonding.
What are unpaired electrons? - Answers Single electrons in the valence shell available for
bonding.
How do you determine the number of bonds an atom will form? - Answers It equals the number
of unpaired electrons.
ΔEN < 0.5 means what type of bond? - Answers Nonpolar covalent (a type of chemical bond
where two atoms share electrons equally because they have the same or very similar
electronegativity (the ability to attract electrons).
ΔEN between 0.5 and 1.9 means what type of bond? - Answers Polar covalent (a type of
covalent bond where two atoms share electrons unequally because one atom has a higher
electronegativity (stronger pull on electrons) than the other.)
ΔEN ≥ 2.0 means what type of bond? - Answers Ionic (a chemical bond formed when one atom
completely transfers one or more electrons to another atom, creating charged particles called
ions.)
Why do atoms form bonds to other atoms? - Answers Energetic stability
To say an atom is energetically stable means that the overall energy of the atom is - Answers
Lower when in the bonded state than in a non-bonded state
T/FLower energy typically means greater stability? Why - Answers Trueb/c the electron
configuration of the atom - atomic valence
Name 5 common elements found in organic compounds besides carbon. - Answers Hydrogen,
Oxygen, Nitrogen, Sulfur, Halogens.
What unique property allows carbon to form so many compounds? - Answers Catenation —
carbon's ability to bond with other carbon atoms.
What structures can carbon form? - Answers Chains or rings, with single, double, or triple bonds.
Define an organic - Answers A covalently bonded compound containing carbon, excluding
carbonates and oxides.
Why are there more organic than inorganic compounds? - Answers Carbon's catenation and
ability to bond with many other elements create structural diversity.
What does the group number of an element tell you? - Answers The number of valence
electrons for main group elements.
What are lone pairs? - Answers Paired electrons in the valence shell that are not involved in
bonding.
What are unpaired electrons? - Answers Single electrons in the valence shell available for
bonding.
How do you determine the number of bonds an atom will form? - Answers It equals the number
of unpaired electrons.
ΔEN < 0.5 means what type of bond? - Answers Nonpolar covalent (a type of chemical bond
where two atoms share electrons equally because they have the same or very similar
electronegativity (the ability to attract electrons).
ΔEN between 0.5 and 1.9 means what type of bond? - Answers Polar covalent (a type of
covalent bond where two atoms share electrons unequally because one atom has a higher
electronegativity (stronger pull on electrons) than the other.)
ΔEN ≥ 2.0 means what type of bond? - Answers Ionic (a chemical bond formed when one atom
completely transfers one or more electrons to another atom, creating charged particles called
ions.)
Why do atoms form bonds to other atoms? - Answers Energetic stability
To say an atom is energetically stable means that the overall energy of the atom is - Answers
Lower when in the bonded state than in a non-bonded state
T/FLower energy typically means greater stability? Why - Answers Trueb/c the electron
configuration of the atom - atomic valence
