MOLECULAR SHAPES

Quiz Review

Admit Slip

Name as many molecular shapes as you can.

The Rules

Split into groups of 3. Rotate who answers each question.

Each group will get points for participation.

All answers should be written down and not shouted out.

The winning group will receive 2 homework points and candy during the quiz Thursday!

200

What are the names of the regions around atoms where the electrons reside in bonds or lone pairs?

400

Why aren’t molecules flat and with all bonding angles at 90º?

800

Draw the Lewis Dot structure of H2O.

a) How many electron domains does oxygen have

b) How many electron domains does each hydrogen have?

200

Most of the molecular shapes we’ve learned have an underlying tetrahedral shape because the central atom has _____ electron domains.

200

Trigonal planar, on the other hand, is a shape caused when the central atom has ____ electron domains.

200

The central atom in the linear molecule CO2 has only ____ electron domains.

400

The molecule H2O has which shape?a) tetrahedral b) pyramidal

c) bentd) linear e) trigonal planar

400

The molecule methane, CH4 has which shape?a) tetrahedral b) pyramidal

c) bentd) linear e) trigonal planar

400

The atom neon, Ne has which shape?a) tetrahedral b) pyramidal

c) bent d) pointe) linear

400

The molecule NH3 has which shape?a) tetrahedral b) pyramidal

c) bentd) linear e) trigonal planar

600

Draw the following molecules as Lewis Dot structures and then identify the shape.CF4

600

Draw the following molecules as Lewis Dot structures and then identify the shape.H2S

600

Draw the following molecules as Lewis Dot structures and then identify the shape.CH2Br2

600

Draw the following molecules as Lewis Dot structures and then identify the shape.CH2O

600

Draw the following molecules as Lewis Dot structures and then identify the shape.CO2

800

Draw the following molecules as Lewis Dot structures and then identify the shape.CH3NH2

Shape on C:

Shape on N:

400

Carbon (C) reacts with bromine (Br) to form carbon tetrabromide (CBr4).

a. Draw the Lewis dot structures for carbon (C) and bromine (Br) individually.

400

b. Draw the Lewis dot structure for carbon tetrabromide (CBr4).

400

c. Identify the shape of the CBr4 molecule as predicted by valence-shell electron-pair repulsion (VSEPR) theory and explain why CBr4 has this shape.

Final Jeopardy

The total amount of points possible is:

8600

Final Jeopardy

Draw the Lewis Dot Structure for:

CH2S

What shape is this molecule and why?