Revised 2024 - Unit 4 Chemical Bonding Review

Front

What is the Lewis electron-dot structure for magnesium fluoride?

Back

The Lewis structure shows magnesium (Mg) with two dots representing its two valence electrons and two fluorine (F) atoms, each with seven dots representing their seven valence electrons. The structure indicates that magnesium donates its two electrons to the two fluorine atoms, forming ionic bonds.

Front

What characteristic of C5H12 causes it to have a higher boiling point than C2H6?

Back

The force of attraction between molecules of C5H12 is greater due to its larger molecular size and increased van der Waals forces compared to C2H6.

Front

Which formula represents a nonpolar molecule?

Back

CCl4 is a nonpolar molecule because it has a symmetrical tetrahedral shape, resulting in the cancellation of dipole moments.

Front

Why is potassium nitrate classified as an electrolyte?

Back

Potassium nitrate is classified as an electrolyte because it releases ions in an aqueous solution, allowing it to conduct electricity.

Front

What is the difference in electrical conductivity between NaCl(s) and NaCl(ℓ)?

Back

NaCl(ℓ) has higher electrical conductivity than NaCl(s) because in the liquid state, the ions are free to move, whereas in the solid state, they are fixed in place.

Front

Define ionic bond.

Back

An ionic bond is a type of chemical bond formed through the electrostatic attraction between oppositely charged ions, typically between a metal and a nonmetal.

Front

What is a polar molecule?

Back

A polar molecule is a molecule that has a net dipole moment due to the presence of polar bonds, resulting in a partial positive charge on one end and a partial negative charge on the other.

Front

Explain the concept of electronegativity.

Back

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. It influences the type of bond formed between atoms.

Front

What is the empirical formula of a compound?

Back

The empirical formula of a compound is the simplest whole-number ratio of the elements present in that compound.

Front

What is the significance of molecular geometry in determining polarity?

Back

Molecular geometry affects the distribution of charge within a molecule, which in turn determines whether the molecule is polar or nonpolar.