Chemical Bonding Summative Assessment

When an atom of sodium and an atom of fluorine combine, an ionic bond is formed. Which statement correctly describes the behavior of the valence electron in the ionic bond?

• An electron from the fluorine atom moves to the sodium atom forming two ions
• An electron from the sodium atom moves to the fluorine atom forming two ions
• An electron from the fluorine atom is shared with the sodium atom forming one cation
• An electron from the sodium atom is shared with the fluorine atom forming one anion

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following pairs is unlikely to form a compound?

• K and I
• Ca and Cl
• Fe and S
• Ne and Ar

The reason that salt crystallines, such as KCl, are held together so well is because the cations are strongly attracted to:

• neighboring cations
• protons in the nucleus of the bonding atom
• delocalized electrons
• neighboring anions

The lewis dot structure for a compound is shown. Which element could be represented by element X?

• Bromine (Br)
• Sulfur (S)
• Nitrogen (N)
• Silicon (Si)

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Under standard conditions, water exists as a liquid, but H₂S is a gas. This difference in phase can be explained by:

• The hydrogen bonding between molecules in water
• The hydrogen bonding between molecules in H₂S
• The greater molecular mass of H₂S
• The greater atomic radii of H₂S

Limestone is a naturally occuring form of calcium carbonate. The correct formula for calcium carbonate is:

• CaCO₃
• Ca₂(CO₃)₂
• Ca₃CO
• Ca₂CO₂

When an element in group 2A combines with an element in group 5A, they produce a compound. What is the correct bonding ratio between these elements?

• 2:3
• 3:2
• 2:5
• 5:2

Provide the IUPAC name for NH4NO3.

• ammonium nitrogen trioxide
• nitrogen hydride nitrate
• ammonium nitrate
• ammonium (IV) nitrate

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

Which of the following is the correct Lewis structure for ammonia?

• A
• B
• C
• D