In the “Alloys: The Copper, ‘Silver’ and ‘Gold’ Penny Experiment,” the color of a penny changes to silver when it’s dropped into a hot solution of NaOH and zinc powder. What is the reason for the color change?

1. Which piece of equipment would be BEST to measure 5 mL of a liquid?
a) A disposable dropper
b) A 50 mL Beaker filled halfway between the 0 and 10 mL markings
c) A 100 mL Graduated cylinder
d) A 50 mL Erlenmeyer flask filled halfway between the 0 and 10 mL markings
e) A 10 ml Graduated cylinder

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