The EPA Has Determined That the Maximum Safe Level of Lead

question 116

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 0.0065 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)65 ppb, not safe
• B)6.5 ppb, safe
• C)650 ppb, not safe
• D)0.65 ppb, safe
• E)6.5 × 10^-6 ppm, safe

Grasp the concepts and applications of special document elements, such as citations, footers, and headers.

Identify and utilize different features of Word document to effectively organize and navigate through the text.

Understand and apply various document formatting tools including headers, footers, and section breaks.

Utilize tools for referencing and citation within documents.

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Definitions:

Mixed Cost

An expense that has both fixed and variable components, changing in total with the level of activity but not in direct proportion.

Least-squares Regression

A statistical method used to determine the line of best fit by minimizing the sum of squares of the differences between observed values and those predicted by a linear function.

High-low Method

A technique used in accounting to estimate variable and fixed costs based on the highest and lowest levels of activity.

Utility Costs

The expenses associated with using utilities such as water, electricity, and gas in a business or household.