chem exam 3-cheat sheet

How many electrons does Boron(B) want?

6

How many electrons does beryllium(Be) want?

4

A single bond has what

1 sigma?

A double bond has what

1 sigma and 1 pi

A triple bond has what

1 sigma and 2 pi

Linear has what degree

180

Trigonal planar has what degree

120

Tetrahedral has what degree

109.5

Bent has what degree

Less than 120

Trigonal pyramidal has what degree

Less than 109.5

The dipole goes which way

Positive to negative

What is the range for non-polar

0-0.4

What is the range for polar

0.5-1.9

What is the range for ionic

2.0 and above

What shapes are non polar

Linear, trig. Planar, and tetrahedral IF they have same element configuration

What shapes are polar

Bent, trig. Pyramidal AND all others if different element configuration occurs

What is the difference between bent and linear

Bent has LPs on central atom and linear doesn’t

What is the difference between Trigonal pyramidal and Trigonal planar

Pyramidal has LPs on central atom whereas planar does not

How many groups does linear have? (Atoms connected to central atom)

2

How many groups does trigonal planar have? (Atoms connected to central atom)

3

How many groups does tetrahedral have? (Atoms connected to central atom)

4