chemistry lab report

Laboratory 10

Revised FA 2016

Molecular Model Lab

143

CHEM 101

GENERAL INORGANIC CHEMISTRY I LABORATORY 10

MOLECULAR MODEL LAB

OBJECTIVE :

To learn about the geometry, shape, and polarity of molecules.

Learning Activities :

Pre-Lab

1. Read Lab 10.

2. Read Chapter 9 and Chapter 10 of your textbook.

Lab

3. You should make models of the molecules/ions given in the following table. Use the Molecular model kit and the following key:

Element name Chemical Symbol Color

Hydrogen	H	White
Carbon	C	Black
Oxygen	O	Red
Nitrogen	N	Blue
Chlorine	Cl	Green
Bromine	Br	Orange
iodine	I	purple

4. Fill in the table giving the number of valence electrons, Lewis Structure, sketch, electron pair geometry (EP), molecular geometry (MG), Bond Polarity (BP) and Molecular polarity. Tables of Molecular/Electron pair geometry and Electronegativity values are on page 147.

5. Draw Lewis Structure and make model of your assigned molecule.

6. Your Lab Instructor will initial the Title Page of Your Lab to indicate that you have attended the lab, completed the required lab activities, cleaned your lab bench and all equipment used, and returned all lab equipment to its designated space. A Lab Report that is not initialed in the Checkout box may not be graded. It is at the discretion of your Lab Instructor.

7. Study for the Quiz next week.

Electronegativity Values

http://imgarcade.com/1/electronegativity‐examples/

Lab 10 Molecular Models

Name/Molecular Formula Electron Pair Geometry(EG) Bond Polarity (BP) Number of Valence e‐ Lewis Structure Sketch Molecular Geometry (MG) Molecular Polarity(MP)

EXAMPLE CH4 Methane 8 valence e‐			EG – tetrahedral 4 bonds MG ‐ tetrahedral	C‐H bond non polar (2.5‐2.2) Non polar molecule
N2 Nitrogen
NH3 Ammonia
NH + 4 Ammonium Ion
HCN Hydrocyanic Acid

150

Name/Molecular Formula

Electron Pair Geometry(EG)

Bond Polarity (BP)

Number of Valence e‐

Lewis Structure

Sketch

Molecular Geometry (MG)

Molecular Polarity(MP)

BF3 Boron Trifluoride (octet rule not followed)
CO2 Carbon Dioxide
NO ‐ 3 Nitrate Ion (resonance)
C2H4 Ethylene
SO2 Sulfur Dioxide

Obtain an Assigned Molecular Compound from your Lab Instructor.

1. Write the formula and name of your compound here.

2. Make a model of your compound. You must show this model to your Lab

Instructor

and have them initial here .

3. Make a sketch of your compound below.

4. Draw the Lewis Structure of your Compound.

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Lab 10 Report Models Title Page

Name

Date of Lab

Lab 10 CHECK OUT Lab Instructor’s Initials

Your Lab Instructor will initial the Title Page of Your Lab to indicate that you have attended the lab, completed the required lab activities, cleaned your lab bench and all equipment used, and returned all lab equipment to its designated space. A Lab Report that is not initialed in the Checkout box may not be graded. It is at the discretion of your Lab Instructor

Please use this page as the title page of your lab report.

Lab 10 Report – 15 points

Title page

1. Turn in the completed molecular model tables giving the number of valence electrons, Lewis Structure, sketch, electron pair geometry (EP), molecular geometry (MG), Bond Polarity (BP) and Molecular polarity Your Instructor many assign you additional questions.

(9 points)

2. Turn in the Assigned Molecular Compound page 151. (4 points)

3. Write a paragraph summarizing what you have learned in this lab. (2 points)

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