Chem lab 6 and 7

Lab 7 Precipitation Reactions CHEM101L

Student Name:

Access Code (located on the lid of your lab kit):

Pre-Lab Questions:

1. Under what conditions will a precipitate form?

2. What information do you need to calculate percent yield?

3. Where can you go to find the information regarding the atomic mass of an element?

4. Why is atomic mass significant to calculating percent yield?

Experiment 1: Testing for Calcium Ion, Ca2+

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Post-Lab Questions:

1. In your own words define and describe a precipitation reaction.

2. What is the name of your precipitate?

3. What is the difference between Ca and Ca2+?

Record your observations here.
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Lab 6 Mo

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ccess Code (located on the lid of your lab kit):

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re-Lab Questions:

1.

 

Describe the difference between valence and core electrons.

2. What is the octet rule and which elements obey the octet rule?

3. How does VSEPR affect the shape of molecules?

4. What effect does the presence of lone-pair electrons have on the bond angles in a molecule?

Experiment 1: Molecular Models of Neutral Molecules

Part 1: Periodic Table

Table 1: Lewis Dot

Structure

s

Element

Symbol

Group Number

Valence Electrons

Lewis Dot Structure

Hydrogen

(Upload photo below)

Carbon

(Upload photo below)

Chlorine

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Aluminum

(Upload photo below)

O

xygen

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F

luorine

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Neon

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Nitrogen

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Table 1 Upload of Lewis Dot Structure Sketches with your name and access code handwritten in the background:

Part 2: Construction of Molecules

Table 2

Bond Angle

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Molecule (central atom is underlined)	Sketch of Lewis Dot Structure	Shape Name	Bond Angle	Structure
CO2	Linear
AlCl3	Trigonal Planar
H2O	Bent
NH3	Trigonal pyramidal
CCl4	Tetrahedral
PCl5	Trigonal bipyramidal
SF6	Octahedral

Table 2 Upload of Lewis Dot Structure Sketches and Molecular Models (Table 2a) with your name and access code handwritten in the background:

Table 2 Upload of Lewis Dot Structure Sketches and Molecular Models (Table 2b) with your name and access code handwritten in the background:

Post-Lab Questions:

1. Should all of the angles in methane (CH4) be equal? Why or why not?

2. What additional information does the VSEPR theory give you beyond electron dot structures, in terms of molecular structure?

3. Sketch the molecular shape of the following compounds. Be sure to label the bond angles. Upload the photo below.

Table 3

Compound

H2

Cl2

SO2

NH3

MoF6

Table 3 Upload of molecular shape sketches with your name and access code handwritten in the background:

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Lab 6 Molecular Geometry CHEM101L

Table 1 Upload Name & Access Code (please write neatly): __________________________________________

Hydrogen	Carbon
Chlorine	Aluminum
Oxygen	Fluorine
Neon	Nitrogen

Lab 6 Molecular Geometry CHEM101L

Table 2a Upload Name & Access Code (please write neatly): __________________________________________

Molecule	Sketch of Lewis Dot Structure	Molecular Model (place in box for photo)
CO2
AlCl3
H2O
NH3

Lab 6 Molecular Geometry CHEM101L

Table 2b Upload Name & Access Code (please write neatly): __________________________________________

Molecule	Sketch of Lewis Dot Structure	Molecular Model (place in box for photo)
CCl4
PCl5
SF6

Lab 6 Molecular Geometry CHEM101L

Table 3 Upload Name & Access Code (please write neatly): __________________________________________

H2	Cl2
SO2	NH3
MoF6