CP Chem Ch6

How do polarity and the shape of molecules relate to the properties of a substance?

Shape and polarity can affect how a molecule fits into another structure and how it tastes. It can affect how easy the molecule is to separate and it's attraction positively or negatively charged objects

How does one unbonded pair of electrons affect the shape of a molecule?

The electrons in the unbonded pair repel bonding electrons as far away as possible from it

What evidence is there to support the idea that opposite polar ends of molecules attract each other?

The energy required to separate polar molecules is greater than that required to separate nonpolar molecules.

How do multiple unbonded pairs of electrons affect the shape of a molecule?

They can repel each other as weel as bonding electrons and form a bending molecule

the shape of molecules that contain only two atoms is... linear bent trigonal planar both a and b

a

VSEPR applied to the unshared pairs of electrons around the central atom of which compound would suggest that the molecule has a bent shape? CO₂ H₂O CS₂ HF

b

The structure of which of the following compounds suggests that it has the highest boiling point? CO, CO₂, H₂S, O₂

c

The structure of which of the following compounds suggests that it has the highest melting point? BF₃, CO₂, H₂O, O₂

c

VSEPR theory predicts that the shape of which of the following compounds is not trigonal pyramidal? PBr₃, NCl₃, BF₃, NH₃

c

Which of the following molecules is nonpolar? NF₃, H₂O, C₂H₄, H₃P

c

According to the VSEPR theory, which of the following shapes is possible for a molecule with the molecular formula of AB₂? linear bent trigonal pyrmidal both a and b

d

VSEPR theory predicts the shape of some molecules is limited to polar molecules assumes that pairs of valence electrons surrounding an atom repel each other both a and c

d

VSEPR theory predicts that the shape of carbon tetrachloride, CCl₄, is... linear, bent, trigonal planar, tetrahedal

d

know all that Lewis structure stuff

kay

Atoms have __ potential energy and __ stability after they form a covalent bond.

less, more

What are the five names of the shapes the VSEPR theory can predict?

linear, bent, trigonal planar, tetrahedal, trigonal pyramidal

What does the VSEPR theory predict?

molecular shapes (based on the Lewis structure)

The greater the electronegativity difference, the greater the __ of the bond.

polarity

The __ of a molecule affects the molecule's physical and chemical properties.

shape