Ionic and Molecular Properties Assessment

The video tutorial covers the concepts of ionic and polar bonds, using NaCl as an example of an ionic compound. It explains the continuum of electronegativity differences and how they affect bond types. The tutorial also discusses polar molecules, using water and ammonia as examples, and explains the concept of dipole moments. The video further explores ions, their sizes, and introduces the concept of isoelectronic species, highlighting how different ions can have the same electron configuration but differ in size due to varying proton numbers.

What is the difference in electronegativity between Na and Cl, and what type of bond does this create?

• 1.1, covalent bond

• 2.1, ionic bond

• 0.9, metallic bond

• 3.0, hydrogen bond

What two factors must be present for a molecule to be polar?

• Non-polar bonds and non-canceling shape

• Polar bonds and symmetrical shape

• Non-polar bonds and symmetrical shape

• Polar bonds and non-canceling shape

Which molecule is a classic example of a polar molecule due to its bent shape?

• Oxygen

• Water

• Methane

• Carbon dioxide

In ammonia (NH3), where is the center of negative charge located?

• On the ammonia molecule as a whole

• On the nitrogen atom

• In the middle of the molecule

• On the hydrogen atoms

What happens to the size of a sodium atom when it becomes a sodium ion?

• It becomes larger

• It remains the same

• It becomes smaller

• It becomes a different element

What is the term for ions with a positive charge?

• Anions

• Cations

• Neutrons

• Protons

What does the term 'isoelectronic' mean?

• Same atomic mass

• Same number of protons

• Same chemical properties

• Same number of electrons

Which of the following ions is isoelectronic with neon?

• All of the above

• Sodium ion (Na+)

• Magnesium ion (Mg2+)

• Fluoride ion (F-)

Why is the magnesium ion smaller than the sodium ion, even though both are isoelectronic?

• Magnesium has more protons

• Sodium has fewer electrons

• Magnesium has fewer electrons

• Sodium has more protons

Which ion would be the largest among isoelectronic species?

• Neon atom

• Magnesium ion (Mg2+)

• Sodium ion (Na+)

• Fluoride ion (F-)