11/4 What are Lewis structures? - Part II
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Transcript of 11/4 What are Lewis structures? - Part II
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Launch: 11/4 Grab your binder and immediately take a seat!
Place homework (practice questions) on desk
1. Draw the correct Lewis structures for the following atoms. Be sure to use the 3-steps!
i. Br2
ii. H2S iii. CCl4
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Schedule We have an exam in 6 days!
We don’t have time to waste! Follow our 7 class rules
You may not use inappropriate language
If you have a question, ask!
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What are Lewis structures? – Part II
Mr. Heffner 11/4/09
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Lewis structures are… pictures of covalent molecules
nonmetal and nonmetal share to get 8
F • • • • • • -
What are Lewis structures?
Lewis Structure
F • • • •
• • Covalent Bond
(dash = 2 electrons)
8 =
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What are Lewis structures?
Cocaine C17H21NO4
Double Bond 2 dashes = 4 electrons
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What are Lewis structures? Large biological molecules are made of
carbon (C) – 4 bonds nitrogen (N) – 3 bonds
oxygen (O) – 2 bonds hydrogen (H) – 1 bond
To fill octet C, N, & O sometimes form double/triple bonds H, I, Br, Cl and everything else = only single bonds
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What is a Lewis structure? There is a 3-step process for creating Lewis
structures: 1. Draw Lewis symbols & count dots 2. Arrange atoms so they have a full octet
If necessary form a double/triple bond
3. Count dots & make bonds
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Example Draw the Lewis structure for O2
Step 1: Draw Lewis symbols & count dots
O • • •
• • • 12 dots
O • •
• •
• •
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Example Draw the Lewis structure for O2
Step 2: Arrange atoms so they have a full octet
7 = 7 =
O • • • • • • O
• •
• •
• •
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Example Draw the Lewis structure for O2
Step 2: Arrange atoms so they have a full octet
8 = 8 =
O • • •
• • • O
• •
• •
• •
• •
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• • •
Example Draw the Lewis structure for O2
Step 3: Count dots & make bonds
O • • • • • O •
• • •
Double Bond 2 dashes = 4 electrons 12 dots
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Example Draw the Lewis structure for N2
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Whiteboards Work in pairs
Trade-off marker every question
You have 60 seconds to draw the answer Show all three steps!
Lift board only when prompted
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CCl4
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CO2
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CH2Cl2
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N2
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Molecular Models Work with partner
1. draw all the Lewis symbols 2. draw the correct Lewis structure
3. build a model using toothpicks and candy 4. draw a picture of your model (label the atoms) 5. identify the types of bonds present in molecule
!"#$%&''(&"$ $ )*+$%,-.,"/$
01&2345"-$ $ 6678$
*",9539&$:;&453<(4=$$!<>&9;>,"$!</&>4$
$
01&239,>$
?<"2;>,$)&.34$+-2@<>4$ )&.34$+5";95;"&$ !</&>$*395;"&$
+3(A>&B$
C<;@>&B$
D"3E>&F$
%0>$ $ $ $
$
0G%H$ $ $ $
$
IG$ $ $ $
$
Step 1 Step 2 Step 3
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Exit Slip 1. The bonds in water (H2O) are
a. single bonds b. ionic bonds
c. triple bonds d. double bonds
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Exit Slip 2. The correct Lewis structure for CO2 is
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Exit Slip 3. Which of the following molecules contains a
covalent triple bond? a. C2H2 b. I2 c. NH3
d. N2
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Exit Slip 4. Bubble in A
Then, draw the Lewis structure for SiF4
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Exit Slip 5. Bubble in A
Then, draw the Lewis symbol for O2
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Homework Finish Lewis symbol and ions worksheet