Team D Week 6 Lab Discussion

Topics: Valence, Chemical bond, Chemical bonding Pages: 7 (1063 words) Published: April 20, 2015


Week 6 Lab Discussion
Team D/CHM 150
Jazzmin Te
Chelsie Pfeiff
University of Phoenix

Individual Results
Week 5 included two labs; Lewis Structure Lab and Identification of Metallic Ions Lab. In the Lewis Structure Lab we investigated the ways the space around atoms are thought to be filled by shared electron orbitals and lone pairs of electrons. This was first modeled using balloons. Students then wrote out the geometries produced by the expected orbitals in the provided tables of compounds. Consolidated tables of results below: Table 1: Lewis Structures Part A Results

Part A
Geoff
Ashley
Ed
Ashton
NH3
Tetrahedral, trigonal pyramidal
Tetrahedral, trigonal pyramidal
Tetrahedral, trigonal pyramidal
Tetrahedral, trigonal pyramidal
H2O
Tetrahedral, bent
Tetrahedral, bent 109 degrees
Tetrahedral, planar bent
Tetrahedral, bent
CBr4
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral 109.5 degrees
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral
SO3
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar
PI3
Tetrahedral, trigonal pyramidal
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar
Tetrahedral, trigonal pyramidal
CH3Cl
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral 109.5 degrees
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral
NO3+
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar 120 deg
Tetrahedral, trigonal planar
Trigonal planar, trigonal planar
CO3+
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar 120 deg
Trigonal planar, trigonal planar
Trigonal planar, trigonal planar
NH4+
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral 109.5 degrees
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral
CH4
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral 109.5 degrees
Tetrahedral, tetrahedral
Tetrahedral, tetrahedral
SO2
Trigonal planar, bent
Trigonal planar, bent 120 degrees
Trigonal planar, planar bent
Trigonal planar, bent

Table 2: Lewis Structures Part B Results
Part B
Geoff
Ashley
Ed
Ashton
CH3OH
C = tetrahedral
C = tetrahedral
C = tetrahedral
C = tetrahedral
 
O = bent
O = bent
O = bent
O = bent
 
2 bonded
2 bonded
2 bonded
2 bonded
 
2 non bonded
2 non bonded
2 non bonded
2 non bonded
CH3NH2
C – tetrahedral
Tetrahedral
C = tetrahedral
C = tetrahedral
 
N – trigonal pyramidal
4 bonded
N = trigonal pyramidal
N = trigonal pyramidal
 
6 bonded
 
1 unbonded pair
4 bonded
 
1 non bonded
 

1 non-bonded
CH2CH2
C – trigonal planar
Trigonal planar
Planar
C = trigonal planar
 
5 sigma bonded pairs
5 single bonds
C's double bonded
4 bonded
 
1 pi bond pair
1 double bonds

0 non-bonded
 

 

CH3OCH3
C – tetrahedral
2 trigonal planar
O = bent
C = tetrahedral
 
O - bent
1 tetrahedral
2 bonded
O = bent
 

 
2 unbonded
2 bonded
 
 
 
C= tetrahedral
2 non-bonded

Identification of Metallic Ions Lab:
The Identification of Metallic Ions Lab was conducted by cooking samples of known ionic solutions over a flame and observing the colors created, then comparing those with the unknown to try to identify it. The Labpaq burner flame with its yellow and blue colors caused some obscuration, so results were somewhat constrained (Jeschofnig, 2012). However, the ions sampled did burn with bright colors, so the students were entertained and the unknown was identified as Strontium. Table of results follows.

Table 3: Identification of Metallic Ions
Metal
Geoff
Ashley
Ed
Ashton
Sodium
Yellow-orange
Dark yellow
Yellow
Yellow
Strontium
Pink-reddish
Dark red
Red
Red
Potassium
Bluish
Dark blue-purple
Purple
Light blue
Lead
Not in kit
Orange-reddish
Not in kit
Pale green
Barium
Yellowish
Yellow
White
Yellow
Copper
Greenish
Bluish green
Green
Bright green
Lithium
Pinkish...

References: Jeschofnig, Peter, PhD. Lab assistant Version 42-0196-00-01,p14-21. Retrieved from: www.LabPaq.com September 14,2014
Science Clarified. (n.d.). Retrieved April 12, 2015, from http://www.scienceclarified.com/everyday/Real-Life-Chemistry-Vol-2/Chemical-Bonding-Real-life-applications.html
Tro, Nivaldo J., Chemistry: A Molecular Approach P. 88-89, 145-148
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