The EPA Has Determined That the Maximum Safe Level of Lead

question 62

Multiple Choice

The EPA has determined that the maximum safe level of lead ion in drinking water is 15 ppb.If a sample of tap water has a lead ion concentration of 0.016 ppm, what is the concentration of the lead ion in ppb, and is the water safe to drink? Assume the density of the solution is 1.00 g/mL.

• A)160 ppb, not safe
• B)16 ppb, not safe
• C)1600 ppb, not safe
• D)0.16 ppb, safe
• E)1.6 * 10^-6 ppm, safe

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Definitions:

Subduction

The process by which one tectonic plate moves under another plate and into the mantle, causing volcanic and seismic activity.

Normal Faulting

A type of faulting in which the hangwall moves downward relative to the footwall, often associated with tensional forces pulling the Earth's crust apart.

Volcanic Neck

A column of solidified lava or magma that formed in the vent of a volcano and became exposed through erosion.

Igneous Feature

A geological formation that results from the solidification and crystallization of magma or lava, such as volcanoes or granite intrusions.