PS QUIZ 3

What is electronegativity?

• The ability of an atom to attract electrons in a chemical bond

• The tendency of an atom to repel electrons in a chemical bond

• The measure of an atom's size in a chemical bond

• The strength of the forces of attraction between atoms in a chemical bond

Which of the following statements is true about polar molecules?

• They have positive and negative ends

• They do not have positive or negative ends

• They do not dissolve in polar solvents

• They have lower melting points than nonpolar molecules

According to the rule "like dissolves like," which type of solute would dissolve in a polar solvent?

• Nonpolar solute

• Ionic solute

• Nonpolar solvent

• Polar solute

Which of the following molecules is nonpolar?

• Water (H2O)

• Methanol (CH3OH)

• Hexane (C6H14)

• Benzene (C6H6)

What is the relationship between the melting point and polarity of molecules?

• Polar molecules have higher melting points than nonpolar molecules

• Nonpolar molecules have higher melting points than polar molecules

• Polarity does not affect the melting point of molecules

• Melting point is determined by the size of the molecules, not their polarity

Which of the following statements is true about boiling points?

• Polar molecules have higher boiling points than nonpolar molecules

• Nonpolar molecules have higher boiling points than polar molecules

• Boiling point is not affected by the polarity of molecules

• Boiling point is determined by the size of the molecules, not their polarity

What is the most electronegative element on the periodic table?

• Francium

• Cesium

• Fluorine

• Hydrogen

Which of the following elements is the least electronegative?

• Francium

• Cesium

• Fluorine

• Hydrogen

How does electronegativity generally change across a period on the periodic table?

• It increases

• It decreases

• It remains constant

• It varies unpredictably

What is the shape of a molecule determined by?

• Electronegativity of the atoms in the molecule

• Number of valence electrons in the atoms

• VSEPR theory

• Polarity of the bonds in the molecule