Question 1

Which of the following molecules is an example of a molecule with an expanded octet?

Accepted Answer

SF6

Question 2

According to VSEPR theory, what is the electron geometry of a molecule with three electron groups around the central atom?

Accepted Answer

Trigonal planar

Question 3

Which of the following statements best explains why lone pairs occupy more space than bonding pairs in VSEPR theory?

Accepted Answer

Lone pairs are closer to the nucleus and are not shared between atoms.

Question 4

What is the molecular geometry of ammonia ($$NH_3$$)?

Accepted Answer

Trigonal pyramidal

Question 5

Which bond angle is expected in a molecule with tetrahedral electron geometry?

Accepted Answer

$$109.5^\circ$$

Question 6

A molecule of $$SF_4$$ has five electron groups around the central atom. What is its molecular geometry?

Accepted Answer

Seesaw

Question 7

Which of the following correctly lists the relative repulsive force interactions in VSEPR theory?

Accepted Answer

Lone pair to Lone pair \u003e Lone pair to Bonding pair \u003e Bonding pair to Bonding pair

Question 8

Which of the following molecules has a linear molecular geometry?

Accepted Answer

CO2

Question 9

What is the effect of lone pairs on the bond angles in a molecule with tetrahedral electron geometry?

Accepted Answer

Lone pairs decrease the bond angles.

Question 10

Which of the following central atoms is most likely to have an incomplete octet in its Lewis structure?

Accepted Answer

Boron (B)

Question 11

In the molecule $$BrF_3$$, how many lone pairs are present on the central atom, and what is the molecular geometry?

Accepted Answer

2 lone pairs, T-shaped

Question 12

Which of the following best describes the difference between electron geometry and molecular geometry?

Accepted Answer

Electron geometry considers all electron groups, while molecular geometry considers only the arrangement of atoms.

Question 13

Which of the following molecules has a bond angle closest to $$120^\circ$$?

Accepted Answer

CH2O

Question 14

A molecule has four electron groups: two bonding pairs and two lone pairs. What is its molecular geometry?

Accepted Answer

Bent

Question 15

Which of the following is a real-world example of a molecule with a trigonal bipyramidal electron geometry?

Accepted Answer

PF5

Question 16

What is the molecular geometry of $$XeF_4$$?

Accepted Answer

Square planar

Question 17

Which of the following best explains why $$SF_6$$ can have more than eight electrons around the central atom?

Accepted Answer

Sulfur is in period 3 and can use d orbitals to expand its octet.

Question 18

Which of the following is the correct Lewis structure for $$NO_2$$^-$$?

Accepted Answer

A structure with resonance between one N=O and one N-O bond, with a negative charge on one O.

Question 19

Which of the following statements about the placement of lone pairs in trigonal bipyramidal geometry is correct?

Accepted Answer

Lone pairs always occupy equatorial positions.

Question 20

A molecule has six electron groups around the central atom. What is the electron geometry and a real-world example?

Accepted Answer

Octahedral; SF6

Lewis Structures and VSEPR Theory: Lecture 14 +15

Guida di studio - Domande di pratica