Question 1

According to VSEPR theory, which of the following molecules has a bond angle closest to $$109.5^\circ$$?

Accepted Answer

CH$$_4$$

Question 2

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

Accepted Answer

Lone pairs are localized on one atom, leading to greater electron-electron repulsion compared to bonding pairs.

Question 3

What is the molecular geometry and approximate bond angle of SF$$_6$$?

Accepted Answer

Octahedral, $$90^\circ$$

Question 4

A molecule has the formula AX$$_2E$_2 ($$where E represents a lone pair). What is its molecular geometry?

Accepted Answer

Bent

Question 5

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

Accepted Answer

CO$$_2$$

Question 6

What is the hybridization of the central atom in BF$$_3$$?

Accepted Answer

$$sp^2$$

Question 7

Which of the following best describes a sigma ($$\sigma) $$bond?

Accepted Answer

A bond formed by the end-to-end overlap of orbitals along the internuclear axis.

Question 8

Which hybridization is required for a central atom with five electron groups (e.g., in PF$$_5$$)?

Accepted Answer

$$sp^3d$

Question 9

A student prepares a calibration curve for a spectrophotometry experiment using Beer's Law. If the path length is doubled but the concentration remains the same, what happens to the absorbance?

Accepted Answer

It is doubled.

Question 10

Which of the following is the correct formula for Beer's Law?

Accepted Answer

$$A = \epsilon b c$$

Question 11

What is the molecular geometry of XeF$$_4$$ and the hybridization of the central atom?

Accepted Answer

Square planar, $$sp^3d^2$

Question 12

Which of the following best explains why the geometry of HCN is linear?

Accepted Answer

The central carbon atom has two electron groups, resulting in $$180^\circ$$ bond angles.

Question 13

A student accidentally leaves fingerprints on the cuvette during a spectrophotometry experiment. What is the most likely effect on the absorbance reading?

Accepted Answer

The absorbance reading will be higher than expected.

Question 14

Which of the following molecules requires $$sp$$ hybridization for the central atom?

Accepted Answer

CO$$_2$$

Question 15

In the context of molecular polarity, which statement is correct?

Accepted Answer

A molecule with a symmetrical shape and identical surrounding atoms can be nonpolar even if it has polar bonds.

Question 16

Which of the following best describes a $$\pi (pi) $$bond?

Accepted Answer

A bond formed by the side-to-side overlap of parallel p orbitals.

Question 17

A sample of ore weighing $$0.389 g is $$dissolved and diluted to $$25.00 mL. If $$the solution contains $$2.00 	imes 10$$^{-3}$$ mol of Co$$^{2+}$$, what is the mass percent of Co in the ore? (Molar mass of Co = 58.93$ g/mol)

Accepted Answer

$$11.8\%$$

Question 18

Which of the following molecules has a T-shaped molecular geometry?

Accepted Answer

BrF$$_3$$

Question 19

Which of the following is a correct statement about the effect of lone pairs on bond angles in a molecule?

Accepted Answer

Lone pairs decrease the bond angles between bonding pairs.

Question 20

Which of the following best describes the difference between the Lewis model and valence bond theory in explaining covalent bonding?

Accepted Answer

The Lewis model describes bonding as the sharing of electrons, while valence bond theory describes bonding as the overlap of atomic orbitals.

VSEPR Theory and Molecular Geometry: General Chemistry Study Notes

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