Question 1

Which of the following statements best describes electronegativity?

Accepted Answer

It is the attraction of an atom for the shared electrons in a bond.

Question 2

Given the electronegativity values: $$	ext{K} = 0.8$$, $$	ext{N} = 3.0$$, what type of bond is formed between potassium and nitrogen?

Accepted Answer

Ionic

Question 3

Which molecule is nonpolar due to its symmetrical shape, even though it contains polar bonds?

Accepted Answer

$$	ext{CO}_2$$

Question 4

What is the molecular geometry and bond angle of $$	ext{CH}_4$$ according to VSEPR theory?

Accepted Answer

Tetrahedral, $$109^\circ$$

Question 5

Which of the following molecules has hydrogen bonding as its main intermolecular force?

Accepted Answer

$$	ext{NH}_3$$

Question 6

A molecule of $$	ext{SO}_2$$ has what shape and how many lone pairs on the central atom?

Accepted Answer

Bent, 1 lone pair

Question 7

Which of the following best explains why $$	ext{H}_2	ext{O} is a $$polar molecule?

Accepted Answer

It has polar bonds and a bent shape, so the dipoles do not cancel.

Question 8

Which of the following compounds would have the highest melting point due to its intermolecular forces?

Accepted Answer

$$	ext{KCl}$$

Question 9

What is the main type of attractive force present in liquid $$	ext{Br}_2$$?

Accepted Answer

Dispersion forces

Question 10

Which of the following molecules is classified as nonpolar?

Accepted Answer

$$	ext{CH}_4$$

Question 11

A molecule has three bonds and one lone pair on the central atom. What is its molecular shape according to VSEPR theory?

Accepted Answer

Trigonal pyramidal

Question 12

Which of the following best describes the trend of electronegativity in the periodic table?

Accepted Answer

It increases from left to right across a period and from bottom to top in a group.

Question 13

Which of the following molecules has a dipole moment that does NOT cancel out, making it polar?

Accepted Answer

$$	ext{HCl}$$

Question 14

What is the main intermolecular force present in $$	ext{H}_2	ext{O}$$?

Accepted Answer

Hydrogen bonds

Question 15

Which of the following best describes a nonpolar covalent bond?

Accepted Answer

It is an equal or almost equal sharing of electrons by two nonmetal atoms.

Question 16

Which of the following molecules has a tetrahedral shape?

Accepted Answer

$$	ext{CCl}_4$$

Question 17

Which of the following is a real-life application of hydrogen bonding?

Accepted Answer

The shape and stability of DNA

Question 18

A student mixes $$	ext{HCl}$$ and $$	ext{NaOH} in $$water. Which type of bond is formed between $$	ext{Na}^+$$ and $$	ext{Cl}^- in $$the resulting solution?

Accepted Answer

Ionic bond

Question 19

Which of the following best explains why $$	ext{Br}_2 is a $$liquid at room temperature while $$	ext{Cl}_2 is a $$gas?

Accepted Answer

Br$$_2$$ has stronger dispersion forces due to its larger size.

Question 20

Which of the following molecules is polar due to its trigonal pyramidal shape?

Accepted Answer

$$	ext{PF}_3$$

Electronegativity, Bond Polarity, Molecular Shape, and Intermolecular Forces

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