Question 1

Which of the following best describes electronegativity?

Accepted Answer

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

Question 2

Why does electronegativity decrease as you move down a group in the periodic table?

Accepted Answer

Because atomic radius increases, so the nucleus has less pull on bonding electrons.

Question 3

Arrange the following elements in order of increasing electronegativity: Rb, Na, Li.

Accepted Answer

Rb \u003c Na \u003c Li

Question 4

Which statement correctly explains why electronegativity increases across a period?

Accepted Answer

Atoms have more protons, increasing nuclear charge and attracting electrons more strongly.

Question 5

Which of the following molecules is polar?

Accepted Answer

CH3Cl

Question 6

What is a dipole?

Accepted Answer

A molecule with a separation of positive and negative charges due to unequal sharing of electrons.

Question 7

Which intermolecular force is present between two molecules of CH3OH?

Accepted Answer

Hydrogen bonding

Question 8

What is the molecular shape of BF3?

Accepted Answer

Trigonal planar

Question 9

Which term describes the attraction between one polar molecule and another polar molecule?

Accepted Answer

Dipole-dipole force

Question 10

What is the force that holds the carbon to the oxygen in carbon dioxide ($$CO_2$$)?

Accepted Answer

Covalent bond

Question 11

Which force is responsible for holding separate molecules of bromine ($$Br_2) $$together?

Accepted Answer

London dispersion force

Question 12

Which of the following best explains why London dispersion forces are weaker than dipole-dipole forces and hydrogen bonds?

Accepted Answer

London dispersion forces arise from temporary, random fluctuations in electron distribution.

Question 13

Which force holds cesium fluoride ($$CsF) $$together?

Accepted Answer

Ionic bond

Question 14

When a polar molecule induces a dipole in a nonpolar molecule, which type of intermolecular force is involved?

Accepted Answer

Dipole-induced dipole force

Question 15

During a phase change, such as melting or boiling, what happens to the molecules?

Accepted Answer

Intermolecular forces are overcome, allowing molecules to move more freely.

Question 16

Which molecule will have the highest boiling point: $$NH_3$$, $$N_2$$, or $$CH_2S$$?

Accepted Answer

$$NH_3$$

Question 17

Which force is stronger: the H-O covalent bond in water or the hydrogen bond between two water molecules? Why?

Accepted Answer

The H-O covalent bond is stronger because it involves sharing electrons between atoms.

Question 18

Which of the following best describes the force inside a molecule of nitrogen ($$N_2$$)?

Accepted Answer

Covalent bond

Question 19

A student claims that $$CH_3Cl is $$nonpolar because it contains only single bonds. Which is the best correction?

Accepted Answer

$$CH_3Cl is $$polar because the $$Cl$$ atom is much more electronegative than $$C$$ and $$H$$, creating a dipole.

Question 20

Which intermolecular force is present between two molecules of methane ($$CH_4$$)?

Accepted Answer

London dispersion force

Unit 5 Part 2 Review – Chemical Bonding, Polarity, and Intermolecular Forces

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