# Define Mechanical adv-antage and
the formula.
#4 Write a short note on Compound
machine.​

The chemical reactions lab we did is typically called a "copper plating lab,  because the acid solution cleaned the pennies and made the copper look shinier;   the acid solution cleaned the paperclips and made them look like pennies;   &   the copper from the pennies was removed, and then added to the paperclips. 

Hi there, the property that gives muscles the ability to contract and relax is the presence of actin and myosin.