In chemistry class, Elias determined the effectiveness of various metals in releasing hydrogen gas from hydrochloric acid. Several weeks later, Elias read that a utility company was burying lead next to iron pipes to prevent rusting on the iron pipes. Elias hypothesized that less rusting would occur with more active metals. He placed the following into separate beakers of water: (a) one iron nail, (b) one iron nail wrapped with an aluminum strip, (c) one iron nail wrapped with a magnesium strip, (d) one iron nail wrapped with a lead strip. Each beaker held the same amount of water, the same mass of metals and the same type and size of iron nails. At the end of five days, he rated the amount of rust as small, moderate or large AND recorded the color of the water.