Lesson Plans

Chemistry: The Central Science 9th Edition ©2003

by Brown, LeMay, and Bursten

Week 2: Chemical Reactions

Chapter 3: Stoichiometry: Calculations with Chemical Formulas and Equations; Sections: 3.1–3.2
Chapter 4: Aqueous Reactions and Solution Stoichiometry; Sections: 4.1–4.4

This topic covers very important basic concepts that will be used later in the course. It will probably take a little longer than a week to cover it thoroughly.

College Board Performance Objectives:

• Be able to balance chemical equations.
• Write balanced chemical equations from word descriptions.
• Predict the products of reactions based on the types presented, including combustion of compounds of C, H, and O.
• Complete and balance these reactions.
• Predict to some extent whether a substance will be a strong electrolyte, weak electrolyte, or nonelectrolyte.
• Predict the ions that an electrolyte dissociates into.
• Identify substances as acids, bases, and salts.
• Using solubility rules, predict if a precipitate forms in a metathesis reaction, and thus predict its products and write a balanced equation.
• Predict the products and write a balanced chemical equation for neutralization reactions.
• After constructing molecular reactions for metathesis reactions, be able to identify spectator ions and write the net ionic equations.
• Assign oxidation numbers to atoms.
• Determine whether a reaction is Redox or not.
• Use the activity series to predict whether a Redox (single replacement) reaction will occur, and be able to write the molecular and net ionic equations if it does.

College Board Lab Objectives:

• Observe some typical chemical reactions studied in the text, identify products, and write chemical reactions.
• Become familiar with the relative chemical reactivity of metals.
• Gain experience with reactions in solution.
• Be able to write molecular, ionic, and net ionic equations for these metathesis reactions.

Suggested Labs:

• Experiment 4, Chemical Reactions, p. 37
• Experiment 15, Activity Series, p. 159
• Experiment 21, Reactions in Aqueous Solutions, p. 227

Resources:

• Instructor's Resource Manual, p. 27–32 and pp. 40–49
• Student's Guide, pp. 33–36 and pp. 58–68
• Test Bank, pp. 89–101, and pp. 131–149
• Instructor's Resource CD, Chapters 3 and 4

Pacing Guide:

• Chemical Reactions and Patterns of Reactivity—1 day
• Electrolytes—0.5 days
• Precipitation Reactions—1 day
• Acid-Base Reactions—1.5 days
• Redox Reactions—2 days
• Block Scheduling
  Try to keep up the pace assuming that your students have had the basics of this lesson in Chemistry I. Chemical Reactions and Patterns of Reactivity, Electrolytes, and Precipitation Reactions can be covered in the one block. Use two blocks for an intense study of Acid-Base Reactions and Redox Reactions. Students must complete all suggested exercises.

Key Words:

Suggested Exercises:
Critical thinking questions and end-of-chapter activities are included in these exercises.

• pp. 104–109, # 5, 7, 9, 11, 13, 79.
• pp. 145–149, # 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 35, 37, 39, 41, 43, 44, 45, 80, 83.
• eMedia Exercises: p. 151 # 105–108.

Troubleshooting Tips/Error Traps:

• It is very important that each species in chemical equations be expressed correctly with their physical state and, if they are ions, with their specific charge.
• Oxidation numbers are not always real charges.
• In writing ionic equations, only dissolved strong electrolytes are written as ions.
• There is no reaction if all ions are spectators.