Today we will

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Today we will

• Discuss yesterdays lab
• Learn about polyatomic ions
• Learn about metallic bonds

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Daily Quiz
3
Daily Quiz

• Name the following ionic compounds.

4
Daily Quiz

• 1. CaS

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Daily Quiz

• 2. MgCl2

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Daily Quiz

• 3. LiOH

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Daily Quiz

• 4. K2SO4

.
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Daily Quiz

• 1. CaS

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Daily Quiz

• 1. CaS
• calcium sulfide

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Daily Quiz

• 2. MgCl2

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Daily Quiz

• 2. MgCl2
• magnesium chloride

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Daily Quiz

• 3. LiOH

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Daily Quiz

• 3. LiOH
• lithium hydroxide

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Daily Quiz

• 4. K2SO4

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Daily Quiz

• 4. K2SO4
• potassium sulfate

.
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Making Ionic Compounds
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Making Ionic Compounds
Material Mass (g)
Empty crucible
Crucible and Mg before heating
Magnesium ribbon
Crucible and Mg products after heating
Magnesium products
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Making Ionic Compounds

• Classifying
• What kind of energy was released by the reaction?

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Making Ionic Compounds

• Using Numbers
• How do you know that the magnesium metal reacts
  with certain components of the air?

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Making Ionic Compounds

• Predicting
• Mg reacts with both O and N from the air.
• Predict the binary formulas of both products.
• Write the names of these two compounds.

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Making Ionic Compounds
5. Analyzing and concluding The product formed
from Mg and O is white, and the product formed
from Mg and N is yellow. From your
observations, which compound makes up most of the
product?
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Making Ionic Compounds
6. Analyzing and concluding Did the Mg
compounds and water conduct electric current? Do
the results indicate whether or not the compounds
are ionic?
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Making Ionic Compounds
7. Error Analysis If the magnesium lost mass
instead of gaining mass, what do you think was a
possible source for the error?
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Tonights Homework
Problem 39 on page 227 Questions 40, 42, and 44
on page 231.
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Polyatomic Ions
Most ionic compounds are binary
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Polyatomic Ions
Most ionic compounds are binary but sometimes a
whole group of atoms will carry a charge together
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Polyatomic Ions
Most ionic compounds are binary but sometimes a
whole group of atoms will carry a charge
together. A polyatomic ion is an ion made up of
more than one atom.
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Polyatomic Ions
Example
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Polyatomic Ions
Example NO3- nitrate
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Polyatomic Ions
A polyatomic ion acts just like a monatomic
ion. K NO3- potassium
nitrate
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Polyatomic Ions
A polyatomic ion acts just like a monatomic
ion. KNO3 potassium nitrate
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Polyatomic Ions
A polyatomic ion acts just like a monatomic
ion. Ca2 NO3- calcium
nitrate
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Polyatomic Ions
Because a polyatomic ion is a unit, you never
change the subscripts within the ion. Ca2
NO3- calcium nitrate
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Polyatomic Ions
Because a polyatomic ion is a unit, you never
change the subscripts within the ion. Ca2
(NO3)- calcium nitrate
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Polyatomic Ions
Because a polyatomic ion is a unit, you never
change the subscripts within the ion. Ca(NO3)2
calcium nitrate
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Metallic Bonds
When atoms of metals get together, the atoms
dont give away electrons
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Metallic Bonds
When atoms of metals get together, the atoms
dont give away electrons. Instead, the outer
electron shells overlap so the electrons can
easily float from atom to atom
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Metallic Bonds
When atoms of metals get together, the atoms
dont give away electrons. Instead, the outer
electron shells overlap so the electrons can
easily float from atom to atom. These
delocalized electrons form an electron sea.
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Metallic Bonds
40
Metallic Bonds
41
Metallic Bonds
42
Metallic Bonds
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Metallic Bonds
44
Metallic Bonds
45
Metallic Bonds
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Metallic Bonds
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Metallic Bonds
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Homework
19-23 on pg 224 24-28 on pg 225 40, 42, 44 on pg
231