We can use a gas syringe to measure the reaction of metals with dilute acid. When zinc reacts with hydrochloric acid it produces zinc chloride and hydrogen gas. We can measure the rate of the ...

Brass is 60-82% Cu and 18-40% Zn. To Conduct ... burner flame (3-4 sec.). Students in first few rows report being able to see the zinc turn grey while in the flame. Wash and dry the "gold" penny.