3: Cleaning Pennies Lab

15 September

Below are the notes from class today. This is the Cleaning Pennies Lab Report.

Cleaning Pennies Lab Report

Question

How does changing the household chemicals a penny soaks in affect how clean a penny becomes?

(independent variable) (dependent variable)

Research

-Hard to see details on coins--dirt.

-Old coins

-Metal coins--copper?

-Ketchup has lots of sugar.

-Vinegar is an acid.

-Salt is sodium chloride.

Hypothesis

If I use only vinegar and salt, then the pennies will become clean and shiny.