Polar & Non-Polar Molecules

What is electronegativity?

• The ability of an atom to repel electrons

• The ability of an atom to attract electrons

• The ability of an atom to lose electrons

• The ability of an atom to share electrons

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How does electronegativity change across the periodic table?

• Increases from top to bottom and decreases from left to right

• Increases from left to right and decreases from top to bottom

• Decreases from left to right and increases from top to bottom

• Remains constant across the periodic table

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Why is water able to form hydrogen bonds?

• Because it has a high molecular weight

• Because of its dipole moment

• Because it is a nonpolar molecule

• Because it is a gas at room temperature

What is the significance of water's high heat capacity?

• It stabilizes Earth's climate

• It makes water a good solvent for nonpolar substances

• It causes water to freeze at a lower temperature

• It makes water evaporate quickly

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Which of the following molecules is nonpolar despite having polar bonds?

• Hydrochloric acid

• Ammonia

• Water

• Carbon dioxide

What principle explains why polar solvents dissolve polar substances?

• Law of definite proportions

• Conservation of mass

• Opposites attract

• Like dissolves like

How does geometric asymmetry affect molecular polarity?

• It only affects ionic compounds

• It has no effect on molecular polarity

• It makes a molecule nonpolar regardless of its bonds

• It can make a molecule polar even if it has polar bonds

Why does ice float on water?

• Because ice has a higher temperature than water

• Because ice is a different chemical compound

• Because ice is heavier than water

• Because ice is less dense than liquid water

What role do amphiphilic molecules play in biological membranes?

• They enable the mixing of polar and nonpolar substances

• They repel water molecules

• They dissolve in nonpolar solvents

• They prevent the formation of hydrogen bonds

How does water's dipole moment contribute to its physical properties?

• It leads to hydrogen bonding, affecting surface tension and specific heat

• It makes water a nonpolar solvent

• It causes water to have a low boiling point

• It prevents water from forming ice