Lesson 3: Objectives
Purpose:
To become familiar with the laws and calculations that relate to the amounts of chemicals that react with one another.
To show you how to use chemical equations to represent chemical reactions.
Objectives:
You have completed this lesson when you can:
1. Use observations to distinguish between chemical and physical changes. Recognize chemical reactions by observation or description of the observable changes that take place.
2. Handle chemicals properly--safely and without contamination.
3. Write clear, concise descriptions of chemical reactions. (Note that explanations of chemical reactions will come later.)
4. State or recognize statements of the Law of Conservation of Mass and apply the law where appropriate.
5. Given the weight relationships in a chemical reaction, calculate the amount of a chemical that will react with (or produce or be produced by) a specified amount of another chemical.
6. Define "reagent", "reactant" and "product" and identify them in chemical equations.
7. Distinguish between reactions and equations.
8. Write and interpret word equations.
9. Write and interpret skeleton (unbalanced) equations.
10. Describe what is meant by a balanced equation.
11. Balance simple chemical equations.
12. Use a balanced equation to calculate the amount of one chemical that corresponds to a specified amount of another chemical. ("Corresponds to" can mean "reacts with" or "produces" or "is produced by". The "amount" can be in grams or in moles.)
13. Categorize chemical reactions on the basis of chemical equations.
Assignments:
To be turned in -
- Problem set
- Computer practice session on balancing and categorizing equations
NOTE: Get lots of practice balancing equations and working problems.
Oustide Reading (optional): Find the sections in your text that deal with the following topics and read them.
- chemical and physical changes
- law of conservation of mass
- chemical equations and types of chemical reactions
- stoichiometry