Portland State University - - Professor Carl C. Wamser

Chemistry 331 - Fall 1997

Class Assessment #1

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1. When writing a Lewis structure for CH₄ , the total number of valence electrons you will use is:

A (Green)	5
B ( Red )	8
C (Yellow)	10
D ( Blue )	16

2. When writing a Lewis structure for SO₄^-2 , the total number of valence electrons you will use is:

A (Green)	8
B ( Red )	16
C (Yellow)	32
D ( Blue )	40

For the acid-base reaction shown below,

CH₃OH + HCl <===> CH₃OH₂⁺ + Cl^-

Relevant pKa values are:

CH3OH	16
CH3OH2+	-2
HCl	-5

3. Predict the preferred direction of the equilibrium:

A (Green)	to the right
B ( Red )	to the left

4. Predict the sign of delta G:

A (Green)	positive
B ( Red )	negative