1. goldentigers.org #30 Brass Alloy Lab Chemistry

2. goldentigers.org Dec 16(B) & Dec 17(A) Big Idea: Show Me the Money! Objective: SWBAT make an alloy called brass Do Now: Read, annotate, answer questions Agenda ­ Do Now10 min ­ Group Leader/Greeter ­ Homework & Do Now Review05 min ­ Interim OER Review10 min ­ Finish Copper Retrieval Lab10 min ­ Brass Alloy Lab30 min Homework: Complete worksheet table #30

3. goldentigers.org Purpose (Write Down) Add a layer of zinc to a penny with chemical treatment, then make the alloy brass with heat treatment (To think about) Do you want to have an outer layer on your coin, or use an alloy mixture of metals?

4. goldentigers.org Safety First! SPECIAL SAFETY NOTES: Collect data for last lab; do calcs during todays’ Double check you get your lab pair’s filter Zinc Chloride (ZnCl 2 ) burns; rinse off! Hotplates go in middle of table Grab beakers from the top when taking them off the hotplate Record your penny’s year; Handle heated pennies with: ­ Forceps in beaker ­ Tongs on hotplate Each person does a penny; one control per group NO TALKING TO OTHER GROUPS! Leave worksheets to turn-in on table!