1. Empirical Formula Due Today: Homework: 1. Empirical Formula Pre-Lab
2. Density Short Report
Homework:
1. Empirical Formula Formal Lab Report
Empirical Formula

2. Zinc and chloride reaction
Objective
Experimentally determine the empirical formula of:
Zinc and chloride reaction
Copper and sulfur reaction

3. Procedure Notes Part I: Zinc Chloride Procedure Change:
Use g of zinc
This MUST be done in the hood!
DO NOT touch the evaporating dish with your fingers!

4. Procedure Notes HCl MUST be poured in the hood!
DO NOT have the bunsen burner on!
Heat water while you are waiting for the evaporating dish to cool and the reaction is proceeding

5. Procedure Notes When heating, AVOID spattering
Make sure to get data from another lab group
Return evaporating dish to the oven

6. Procedure Notes Part II: Copper Sulfide Compound
DO NOT touch the crucible and lid with bare hands!
When heating, a blue flame should be rising from inside the crucible

7. When the flame disappears, heat to red hot
Procedure Notes
When the flame disappears, heat to red hot
Make sure to get data from another group
Return crucible and lid to the oven

8. Waste
Dispose of contents in an appropriate waste container

9. Risk assessment
Hydrochloric Acid
Danger
Inhalation Hazard
Corrosive

10. calculations
To calculate moles:
Mole Ratio:

11. calculations Mole ratio: Examples: 1:2 2:1
A ratio should never be reported as a single number