1. Percent Composition Epsom Salt Lab

2. Evaluation/Assessment:
Objective:
Today I will be able to:
Calculate the empirical formula of epsom salt by completing a lab
Determine the percent composition of water in epsom salt by completing a lab
Calculate the percent composition of an element in a compound
Evaluation/Assessment:
Informal Assessment – Monitoring group interactions and questions as they complete the lab
Formal Assessment – Analyzing students responses to the lab calculations and the exit ticket
Common Core Connection
Value Evidence
Make sense of problem and persevere in solving them
Reason abstractly and quantitatively
Attend to precision
Use appropriate tools strategically
Model with mathematics

3. Lesson Sequence Evaluate: Warm – Up Explain: Epsom Salt Lab Safety
Engage and Explore: Epsom Salt Lab
Elaborate: Epsom Salt Lab Calculations
Evaluate: Exit Ticket

4. Warm - Up
What are some lab safety procedures to remember when using a Bunsen burner?

5. Objective Today I will be able to:
Calculate the empirical formula of epsom salt by completing a lab
Determine the percent composition of water in epsom salt by completing a lab
Calculate the percent composition of an element in a compound

6. Homework Study for Stoichiometry Exam – Friday, March 14
Complete Lab Calculations

7. Agenda Evaluate: Warm – Up Explain: Epsom Salt Lab Safety
Engage and Explore: Epsom Salt Lab
Elaborate: Epsom Salt Lab Calculations
Evaluate: Exit Ticket

8. Epsom Salt Lab

9. Epsom Salt Lab Safety
Goggles, aprons, closed toe shoes are required to participate
Long hair must be tied back
Make sure gas is turned off completely when finished using the Bunsen burner
Crucibles will be HOT. Do not touch. Wait 5 minutes before taking the final mass of the crucible

10. Epsom Salt Lab Directions
Today you will be working in pairs
Once you get the lab set up, the water must evaporate from the Epsom salt for 15 minutes
While you wait, work on the percent composition practice problems
When your reaction is complete let the crucible cool down for 5 minutes before taking the mass. It will be HOT!
Leave the lab area as it was when you entered.

11. Epsom Salt Lab Calculations
Complete the calculations for the lab once your sample has cooled. Have one group member write the empirical formula and percent composition of water that each group calculated.

12. Exit Ticket What was the empirical formula of the epsom salt?
What was the percent composition of water in the epsom salt?