U2: Three-Dimensional Molecules: Mastery Test

Select the correct answer. Which molecule has a tetrahedral arrangement of electron pairs but is not a tetrahedral molecule?

• methane

• water

• carbon dioxide

• boron trifluoride

Select the correct answer. What is the molecular geometry, or shape, of chloroform (CHCl₃)?

• tetrahedral

• trigonal pyramidal

• linear

• trigonal planar

Select the correct answer. What is the molecular geometry, or shape, of beryllium chloride (BeCl₂)?

• tetrahedral

• linear

• trigonal pyramid

• bent

Select the correct answer. What is the molecular geometry, or shape, of phosphorus trichloride (PCl₃)?

• tetrahedral

• linear

• trigonal pyramidal

• trigonal bipyramidal

Select the correct answer. The electron–pair geometry of a molecule is tetrahedral. What is its bond angle if there are no lone pairs of electrons?

• 180 degrees

• 120 degrees

• 109.5 degrees

• 360 degrees

Which statement describes the VSEPR theory?

• Electron pairs in the valence shell of an atom have a tendency to attract other nearby electron pairs.

• Electrons in the valence shell of an atom exert a repulsive force on other atoms while forming a chemical bond.

• Electron pairs in the valence shell of an atom exert a repulsive force on all other electron pairs in the valence shell of the atom.

• Electrons in the valence shell exert a repulsive force while completing their octet during the formation of chemical bond.

Why is the bond angle in a water molecule less than the bond angle of methane?

• The central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs.

• The central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs.

• The central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair.

• The central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does.

Select the correct answer. What is the shape of the molecule shown in the image?

• bent

• tetrahedral

• trigonal pyramid

• linear

Select the correct answer. What is the molecular geometry, or shape, of the molecule shown in the image?

• bent

• tetrahedral

• trigonal planar

• linear

Tags

NGSS.HS-PS2-6

Select the correct answer. What is the configuration of all electron pairs arranged around oxygen in a water molecule?

• bent

• trigonal planar

• tetrahedral

• linear