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Scenario 2: Metals and Rusting Iron
In chemistry class, Allen determined the effectiveness of various metals in releasing hydrogen gas from
hydrochloric acid. Several weeks later, Allen read that a utilities company was burying lead next to iron
pipes to prevent rusting. Allen hypothesized that less rusting would occur with the more active metals. He
placed the following into separate beakers of water: (a) 1 iron nail, (b) 1 iron nail wrapped with a aluminum
strip, (c) 1 iron nail wrapped with a magnesium strip, (d) 1 iron nail wrapped with a lead strip. He used the
same amount of water, equal amounts (mass) of the metals, and the same type of iron nail. At the end of 5
days, he rated the amount of rusting as small, moderate, or large. He also recorded the color of the water.
Hypothesis:
Independent variable:
Dependent variable: