QQ Consider yesterdays lab Summarize your conclusion 1
QQ: Consider yesterday’s lab: Summarize your conclusion. 1) What was your hypothesis? 2) What was your conclusion? 3) Give evidence and supporting details. 4) Evaluation: Why is it important to document your observations and data? 5) What do you think the substances were?
Today’s Objective: I can name cations and anions using scientific rules.
Introducing: Ions
1. 3 Potassium Aluminum Sulfate 2 How close are your 2. Magnesium sulfate sketches? 4 3. Sodium chloride 4. Sucrose
1. Potassium aluminum sulfate 2. Magnesium sulfate 3. Sodium chloride 4. Sucrose
Crystals: Solids arranged in repeating lattice pattern Nitride Silicate
What determines the characteristics of a crystal? The way the ions are arranged: * sizes of the ions involved * ratio of the ions
Properties of Ionic Compounds Crystals Hard & Brittle As solid – poor conductor As liquid – good conductor
• Created because of electrostatic attraction • High melting & boiling points Na. Cl = 800 degrees Mg. O = 2, 800 degrees • Conduct electricity when dissolved in water or melted
• Ionic Compounds are created when a cation and anion bond together • Ionic bonds occur between metals and nonmetals
Is fluoride the same as fluorine?
Name an anion: Element Name + -ide -1 Cl Chlor ide -1 S Sulf ide
They’ve lost e
Name a cation: Element Name +1 Na Sodium +2 Mg Magnesium
Formula tells the ratio of the atoms in the compound. Al 2 O 3 Ruby Na. Cl Table Salt Si. O 2 Quartz
Coefficient: 3 x Means x + x Or 3 times x # in front of symbol; tells how many of these 3 Na means 3 sodium atoms
Sub or Super? ? ? Number of Atoms in that bond Ion’s overall charge
a W r e t H 2 O 2 H ato ms
10 H 2 O
Hydroxide -1 OH or OH Overall charge is -1
Assignment: Naming monatomic ions
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