Molecular Geometry Test

What does VSEPR mean?

• Valence electron pairs attract one another

• Protons repulse one another

• Valence electron pairs repulse each other

• Atoms are repulsed from the central atom

What does 'polar' mean? Choose all that apply.

• Atoms with 4 sets of lone pairs

• Molecules with an electronegativity difference under 0.4

• Molecules that are more electronegative on one side than another

• Molecules with no lone pairs

Tags

NGSS.HS-PS2-6

What is electronegativity?

• An electron's charge

• The same as atomic bonding

• Whether they can easily repel electrons

• How easily elements can attract electrons to themselves

Tags

NGSS.HS-PS1-1

If a molecule is trigonal pyramidal, how is that different from a tetrahedral?

• trigonal pyramidal: 1 lone pair and 3 bonds. tetrahedral: 4 bonds, no lone pairs

• trigonal pyramidal: 4 bonds, no lone pairs. tetrahedral: 1 lone pair and 3 bonds

• trigonal pyramidal: 2 lone pairs and 2 atoms. tetrahedral: 4 atoms and no lone pairs

• Trick question, they aren't different.

Why do lone pairs affect molecular geometry?

• They don't affect molecular geometry.

• Lone pairs pull the atoms bonded to the central atom towards them

• Lone pairs repel other electron domains, such as bonds, away from themselves

• Lone pairs are made of protons, which repel the protons in the atoms around the central atom

Why isn't H2O's molecular geometry linear?

• It has two atoms around the central atom, which distorts the shape.

• It has three atoms around the central atom, which distorts the shape

• It has two lone pairs around the central atom, which distort the shape.

• It is linear.

What are the bond angles between each H in BeH2?

• 90

• 120

• 109.5

• 180

What are the bond angles between each H in CH4?

• 109.5

• 120

• 180

• 360

What are the bond angles between each H in H2O?

• 180

• 120

• 360

• 104.5

If a molecule has an electronegativity difference of 0.6, is the bond polar, nonpolar, or ionic?

• Polar

• Nonpolar

• Ionic

• None of the above