Today we will…
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Transcript of Today we will…
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Today we will…Discuss yesterday’s lab
Learn about polyatomic ions
Learn about metallic bonds
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Daily Quiz
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Daily Quiz
Name the following ionic compounds.
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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 CompoundsMaterial 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
2. Classifying
What kind of energy was released by the reaction?
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Making Ionic Compounds
3. Using Numbers
How do you know that the magnesium metal reacts with certain components of the air?
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Making Ionic Compounds
4.PredictingMg 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 Compounds5. 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 Compounds6. 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 Compounds7. 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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Tonight’s Homework:
Problem 39 on page 227
Questions 40, 42, and 44 on page 231.
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Polyatomic IonsMost ionic compounds are binary…
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Polyatomic IonsMost ionic compounds are binary…
…but sometimes a whole group of atoms will carry a charge together
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Polyatomic IonsMost 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 IonsExample:
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Polyatomic IonsExample:
NO3-
nitrate
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Polyatomic IonsA polyatomic ion acts just like a monatomic ion.
K+ NO3-
potassium nitrate
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Polyatomic IonsA polyatomic ion acts just like a monatomic ion.
KNO3
potassium nitrate
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Polyatomic IonsA polyatomic ion acts just like a monatomic ion.
Ca+2 NO3-
calcium nitrate
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Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.
Ca+2 NO3-
calcium nitrate
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Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.
Ca+2 (NO3)-
calcium nitrate
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Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.
Ca(NO3)2
calcium nitrate
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Metallic BondsWhen atoms of metals get together, the atoms don’t give away electrons
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Metallic BondsWhen atoms of metals get together, the atoms don’t give away electrons.
Instead, the outer electron shells overlap so the electrons can easily float from atom to atom
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Metallic BondsWhen atoms of metals get together, the atoms don’t 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
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Metallic Bonds
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Metallic Bonds
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Metallic Bonds
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Metallic Bonds
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Metallic Bonds
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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