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chemwk2labhomework.Report Sheet: Lab 2 CHEM 108
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Experiment 2 Lab Report
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CHEM 108
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Tamatha Anthony |
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C Term |
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name section date
WORKSHEET: Lewis Structures
Fill in all the information in boxes highlighted in yellow!
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Formula |
Total Valence e– |
Lewis Structure: (scan/take photo & upload) |
On central atom: |
Molecular Geometry (from simulation) |
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Bonds |
Lone pairs |
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1. |
I2 |
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(paste here) |
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2. |
N2 |
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(paste here) |
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3. |
H2O |
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(paste here) |
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4. |
NH3 |
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(paste here) |
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5. |
CO2 |
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(paste here) |
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6. |
HCN |
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(paste here) |
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7. |
CHCl3 |
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(paste here) |
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8. |
OH– |
8 |
(paste here) |
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9. |
CO32– |
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(paste here) |
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10. |
NH4+ |
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(paste here) |
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SIMULATION: Molecular Shapes
1. Paste images of the following shapes (scan/photo of your drawing, from Google Images, a screenshot, etc.). Fill in the bond angles below.
Top of Form
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Trigonal planar |
Trigonal pyramidal |
Bent |
Tetrahedral |
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(paste here) |
(paste here) |
(paste here) |
(paste here) |
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Electron geometry: |
Electron geometry: |
Electron geometry: |
Electron geometry: |
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Bond angle: |
Bond angle: |
Bond angle: |
Bond angle: |
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Bottom of Form
2. What is the difference between the trigonal planar and trigonal pyramidal molecular geometries?
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EXPERIMENT: Separation of a Mixture of Solids
Use rules of significant figures; include units with each result.
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Data Table 1: Experiment Data |
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Mass (g) |
Percent of mixture |
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Iron filings |
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Sand |
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Table salt |
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Benzoic acid |
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Total |
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Post-Laboratory Questions
Show work whenever feasible! Use rules of significant figures; include units with each result.
A. How would you explain a sand recovery percentage that is higher than the original sand percentage?
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B. How could you separate a mixture of solid caffeine and sugar and recover both substances as dry solids? Use the solubility information of the white solids below and your understanding of the experiment you completed to concisely list the steps you would take. (Assume that it is impossible to tell the four solids apart just by looking at them!)
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Soluble in: |
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Water |
Methylene chloride |
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Caffeine |
yes |
yes |
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Naphthalene (moth balls) |
no |
yes |
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Sucrose (sugar) |
yes |
no |
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Calcium carbonate (chalk) |
no |
no |
Step 1:
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Step 2:
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Step 3:
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