Today we will…Discuss yesterday’s lab

Learn about polyatomic ions

Learn about metallic bonds

Daily Quiz

Daily Quiz

Name the following ionic compounds.

Daily Quiz

1. CaS

Daily Quiz

2. MgCl2

Daily Quiz

3. LiOH

Daily Quiz

4. K2SO4

.

Daily Quiz

1. CaS

Daily Quiz

1. CaS

calcium sulfide

Daily Quiz

2. MgCl2

Daily Quiz

2. MgCl2

magnesium chloride

Daily Quiz

3. LiOH

Daily Quiz

3. LiOH

lithium hydroxide

Daily Quiz

4. K2SO4

Daily Quiz

4. K2SO4

potassium sulfate

.

Making Ionic Compounds

Making Ionic CompoundsMaterial Mass (g)

Empty crucible

Crucible and Mg before heating

Magnesium ribbon

Crucible and Mg products after heating

Magnesium products

Making Ionic Compounds

2. Classifying

What kind of energy was released by the reaction?

Making Ionic Compounds

3. Using Numbers

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

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.

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?

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?

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?

Tonight’s Homework:

Problem 39 on page 227

Questions 40, 42, and 44 on page 231.

Polyatomic IonsMost ionic compounds are binary…

Polyatomic IonsMost ionic compounds are binary…

…but sometimes a whole group of atoms will carry a charge together

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.

Polyatomic IonsExample:

Polyatomic IonsExample:

NO3-

nitrate

Polyatomic IonsA polyatomic ion acts just like a monatomic ion.

K+ NO3-

potassium nitrate

Polyatomic IonsA polyatomic ion acts just like a monatomic ion.

KNO3

potassium nitrate

Polyatomic IonsA polyatomic ion acts just like a monatomic ion.

Ca+2 NO3-

calcium nitrate

Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.

Ca+2 NO3-

calcium nitrate

Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.

Ca+2 (NO3)-

calcium nitrate

Polyatomic IonsBecause a polyatomic ion is a unit, you never change the subscripts within the ion.

Ca(NO3)2

calcium nitrate

Metallic BondsWhen atoms of metals get together, the atoms don’t give away electrons

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

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.

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Metallic Bonds

Homework:

19-23 on pg 224

24-28 on pg 225

40, 42, 44 on pg 231