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?

2. Today’s Objective:
I can name cations and anions using scientific rules.

3. Introducing: Ions

4. Potassium Aluminum Sulfate 21. 2
How close are your sketches?
2. Magnesium sulfate 3 4
3. Sodium chloride
4. Sucrose

5. 1. Potassium aluminum sulfate
2. Magnesium sulfate
3. Sodium chloride
4. Sucrose

6. Crystals:
Solids arranged in repeating lattice pattern
Nitride
Silicate

7. What determines the characteristics of a crystal?
The way the ions are arranged:
* sizes of the ions involved
* ratio of the ions

8. Properties of Ionic Compounds
Crystals
Hard & Brittle
As solid – poor conductor
As liquid – good conductor

9. Created because of electrostatic attraction
High melting & boiling points
NaCl = 800 degrees
MgO = 2,800 degrees
Conduct electricity when
dissolved in water or melted

10. Ionic Compounds are created when a cation and anion bond together
Ionic bonds occur between metals and nonmetals

11. Is fluoride the same as fluorine?

12. Name an anion:
Element Name + -ide
Cl-1
Chlor
ide
S-1
Sulf
ide

13. They’ve lost e-

14. Name a cation:
Element Name
Na+1
Sodium
Mg+2
Magnesium

15. Formula tells the ratio of the atoms in the compound.
NaCl
TableSalt
SiO2
Al2O3
Quartz
Ruby

16. Coefficient: # in front of symbol; tells how many of these
3x Means x + x + x
Or 3 times x
# in front of symbol;
tells how many of these
3Na means 3 sodium atoms

17. Sub or Super???
Number of
Atoms in that bond
Ion’s overall charge

18. H2O
2 H atoms
Water

19. H2O 10

20. Hydroxide
OH-1 or OH-
Overall charge is -1

22. Assignment:
Naming monatomic ions