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Investigation 7A
Lewis Structures
2 Investigation 7A: Lewis Structures
Each water molecule contains one oxygen atom and two hydrogen atoms.
One central oxygen atom
One hydrogen atom on either side
Why can’t a water molecule be like this?
3 Investigation 7A: Lewis Structures
How many valence electrons does a hydrogen atom have?
How many valence electrons does an oxygen atom have?
How many electrons are available for bonding in hydrogen?
What about in oxygen?
How do bonds form?
4 Investigation 7A: Lewis Structures
How do bonds form?
5 Investigation 7A: Lewis Structures
How do bonds form?
6 Investigation 7A: Lewis Structures
Bonding patterns depend on the number of valence electrons.
Paired electrons do not make bonds.
Part 1: Introduction to Lewis dot diagrams
7 Investigation 7A: Lewis Structures
a. How many bonds should a hydrogen atom normally make?
b. How many bonds should a lithium atom normally make?
c. How many bonds should a carbon atom normally make?
d. How many bonds should a nitrogen atom normally make?
e. How many bonds should an oxygen atom normally make?
f. How many bonds should a helium atom normally make?
Part 1: Introduction to Lewis dot diagrams
8 Investigation 7A: Lewis Structures
How many holes does a red ball have?
How many holes does a black ball have?
How many holes does a blue ball have?
How many holes does a white ball have?
Part 2: Molecules and Lewis structures
Each group of 3 or 4 students should have 1 modeling kit
9 Investigation 7A: Lewis Structures
Can you guess which ball represents which type of atom?
Part 2: Molecules and Lewis structures
10 Investigation 7A: Lewis Structures
H2OChemical formula:
waterCommon name:
H O HStructural diagram: Lewis dot structure:
Part 2: Molecules and Lewis structures
11
Chemical formula ________________
Commonname _________________
Chemical formula ________________
Commonname _________________
Investigation 7A: Lewis Structures
Ethanol Oxygen
Build the following molecules: What type of bond is this?
Part 2: Molecules and Lewis structures
12
Chemical formula ________________
Commonname _________________
Chemical formula ________________
Commonname _________________
Investigation 7A: Lewis Structures
Formaldehyde Dichloroethylene
Build the following molecules:
Part 2: Molecules and Lewis structures
13
Chemical formula __________________
Commonname ___________________
Lewis structure
Chemical formula __________________
Commonname ___________________
Lewis structure
Investigation 7A: Lewis Structures
Build the following molecules:
Ethene Acetic acid
Part 3: Lewis structures from models
14
Chemical formula __________________
Commonname ___________________
Lewis structure
Chemical formula __________________
Commonname ___________________
Lewis structure
Investigation 7A: Lewis Structures
Build the following molecules:
Methylamine Ethanol
Part 3: Lewis structures from models
15 Investigation 7A: Lewis Structures
What is the chemical formula for a molecule made of the following atoms?
Part 4: Molecules with different structures
16 Investigation 7A: Lewis Structures
What is the chemical formula for a molecule made of the following atoms?
Create two different molecules, each with that same chemical formula. Each structure must use all available bonding sites on all atoms.
Be creative! Many diverse compounds can be created using these 8 atoms.
Part 4: Molecules with different structures
17 Investigation 7A: Lewis Structures
What is the chemical formula for a molecule made of the following atoms?
Create two different molecules, each with that same chemical formula. Each structure must use all available bonding sites on all atoms.
Create the Lewis structure for both of your molecules.
Part 4: Molecules with different structures