1. Chemistry 101 Dr. Don DeCoste 3014 Chemistry Annex
2-3 pm Mondays am Thursdays; by appointment; open door policy
CLC: 2021 Chemistry Annex

2. To Do… OWL HW: Friday and Wednesday.
Open now.
Turn in Chapter 6 homework tomorrow in Discussion.
Should have read Chapters 6 and 7; Chapter 15 (1, 2, 4, 5) for Tuesday.
Exam 2: Thursday, March 15 (4 weeks)
Chapters 6, 7, 9, 15, and Section

3. Clicker Question
Balance the following equation (standard) and determine the coefficient for water:
CaC2 + H2O → C2H2 + Ca(OH)2
A) 1
B) 2
C) 3
D) 4

4. Clicker Question
What is the correct unbalanced chemical equation for the reaction of iron(II) oxide with oxygen gas to produce iron(III) oxide?
A) FeO + O2 → Fe2O3
B) FeO2 + O2 → Fe2O3
C) FeO2 + O2 → Fe3O2
D) FeO + O2 → Fe3O2
E) FeO2 + O2 → FeO

5. Clicker Question
Balance the following equation (standard) and determine the sum of the coefficients:
C2H5OH + O2 → CO2 + H2O
A) 4
B) 5
C) 8
D) 9
E) 10

6. Dissolving of an Ionic Compound

7. Figure 7.2 Electrical conductivity of aqueous solutions.
Figure 7-2 p124

8. p129

9. Clicker Question What are the possible products?
AgNO3(aq) + KCl(aq) → ?
A) AgCl and KNO3
B) AgNO3 and KCl
C) AgK and NO3Cl
D) Any of the above could be the products.

10. p129

11. Solubility Rules

12. p130

13. Precipitation Reactions
Know how to use the solubility rules (you will be given them on the exam).
Know how to write equations from reactants (ionic reactants).
Understand what solutions “look” like at a very magnified level.

14. Clicker Question When aqueous AgNO3 and aqueous Na2CrO4
are mixed, what are the formulas of the products?
A) Na2NO3 and AgCrO4
B) NaNO3 and Ag2CrO4
C) NaNO3 and AgCrO4
D) Na2NO3 and Ag2CrO4

15. Clicker Question Given: Na2CrO4(aq) + AgNO3(aq) → Ag2CrO4 + NaNO3
Which is the solid?
A) NaNO3
B) Ag2CrO4
Solubility Rules
Most nitrate salts are soluble.
Most salts of sodium, potassium, and ammonium cations are soluble.
Most chloride salts are soluble. Exceptions: Ag+ and Pb2+.
Most sulfate salts are soluble. Exceptions: Ca2+, Ba2+, and Pb2+.
Most hydroxide salts are only slightly soluble. Soluble ones are: Na+, K+, and Ca2+.
Most sulfide, carbonate, and phosphate salts are only slightly soluble.