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Chemistry 1025 Environmental Science Lab Final Exam Review # 2 Formulas/48 Q/A
Chemistry 1025 Environmental Science Lab Final Exam Review # 2 Formulas/48 Q/A
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Chemistry 1025 Environmental ScienceLab Final Exam Review # 2 Formulas/48
Q/A
What is meant by the "Q" value? - -Q = gap / range
-What is meant by the Average or Mean value? - -the sum of the
measurements divided by the number of measurements.
-the vertical axis is the ___________? - -ordinate (y)
-the horizontal axis is the ____________? - -abscissa (x)
-density is: - -mass divided by volume
-Clearly define precision and accuracy - -Accuracy is how closely the
measured values lie to the true values. Precision is how closely the measured
values lie to one another.
-What is the percent error - -{ [x-y] / y} x 100
y=the accepted value
-In what form do plants and trees generally absorb nitrogen? - -nitrate ion
-What process converts the nitrogen-containing ion in part a) into the
nitrogen-containing ion in part b)? - -nitrification or nitrogen fixation
-Describe nitrification - -ammonium ions are converted to nitrite ions and
then to nitrate ions by bacteria
-What are typical nitrate levels in freshwater? - -less than 1 mg/L
-man-made source of nitrates into the environment. - -animal feedlots,
agricultural run-off, treated municipal water being returned to streams,
urban runoff
-What is methemoglobinemia (blue-baby syndrome)? - -Nitrate ions convert
hemoglobin to a form that can no longer transport oxygen in the baby's
blood. High nitrate levels (above 10 mg/L) in drinking water provided to
babies can cause it.
-Describe the process of eutrophication - -High nitrate ion levels cause
excessive growth of aquatic plants and algae. This reduces water clarity
which induces accelerated plant death. Decomposing dead plants on bottom
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