1. Drill: Determine if the following are molecular or empirical: C3H8N

2. Objective: The student will be able to:
Explore Arithmetic equations in order to explain how balanced equations apply to both chemistry and everyday situations.

3. SAT/HSA Enrichment
Chloral hydrate is a sedative that has played a part in the deaths of a number of celebrities. It has the composition: 14.52% C, % H, 64.30% Cl, and 19.35% O. The empirical formula of Chloral hydrate is…
CHClO
C2H2ClO
CHCl2O
C2H3Cl3O2
C3H3Cl2O3

4. How do I express a chemical equation?
Stoichiometry
How do I express a chemical equation?

5. Inquiry Activity 15 min How Many Can You Make?
Purpose: Use simple molecular models to demonstrate the concept of a limiting reagent in a chemical reaction.
15 min

6. Quantitative Analysis Lab
Purpose:
To determine the values for the coefficients used in a balanced chemical equation.
Complete the Procedure for Day 1 (1-4)
Come back to your seats!
10 Min

7. Using Everyday Equations
More than 3000 cocoons are needed to produce enough silk to make just one elegant Japanese kimono. Like silk manufacturers, chemists must know how much reactant they need to make a certain amount of product. Determining the quantities of reactants and products in a reaction requires a balanced chemical equation.

8. Using Everyday Equations
A balanced chemical equation provides the same kind of quantitative information that a recipe does.

9. Using Everyday Equations
An equation can represent the manufacturing of a single tricycle.

10. Using Balanced Chemical Equations
Chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction.
The calculation of quantities in chemical reactions is a subject of chemistry called Stoichiometry.

11. Sample Problem

12. Sample Problem

13. Sample Problem

14. Sample Problem

15. Practice Problem 2

16. Interpreting Chemical Equations
A balanced chemical equation can be interpreted in terms of different quantities, including numbers of atoms, molecules, or moles; mass; and volume.

17. Interpreting Chemical Equations
Number of Atoms

18. Interpreting Chemical Equations
Number of Molecules

19. Interpreting Chemical Equations
Moles

20. Interpreting Chemical Equations
Mass

21. Interpreting Chemical Equations
Volume

22. Interpreting Chemical Equations

23. Mass Conservation in Chemical Reactions
Mass and atoms are conserved in every chemical reaction.

24. Quantitative Analysis
Complete procedure
Day 1 (5-9)
Clean up
Return to your seats!
20 min

25. Summary Did we accomplish the objective? Explain.
How is a balanced equation similar to a recipe?
How do chemists use balanced equations?
Chemical reactions can be described in terms of quantities?
What quantities are always conserved in chemical reactions?

26. Exit Ticket Arithmetic Equations Exit ticket
Homework: Arithmetic Equations worksheet.