Unit C Assessment

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Unit C Assessment

Use the information in this table to answer question A below.

Variables Used to Determine Water Quality

Metals and Ions
Aluminium	Copper	Molybdenum	Vanadium
Arsenic	Iron	Nickel	Zinc
Beryllium	Lithium	Selenium	Cyanide
Boron	Uranium	Silver	Fluoride
Cadmium	Manganese	Thallium
Cobalt	Mercury
Pesticides and Herbicides
2,4-D	Picloram	Bromoxynil	Chloroprifos
MCPP	Dicamba	Cyanazine	Imazamethabenz
Lindane	Triallate	Malathion	Diuron
Diazanon	Athrazine	Methoxychlor	Dichloprop
Nutrients & Related Variables
Dissolved Oxygen	Total Phosphorous	Nitrite-Nitrogen	pH
Total Nitrogen	Ammonia
Bacteria
Fecal coliforms
Pharmaceuticals
Caffeine	Ibuprofen	Ciprofloxacin

Select one of the variables listed in the table above. Explain why the variable you have chosen is useful in assessing the quality of a water sample.

Use the information in this table to answer questions B, C, D, and E below.

Water Quality Data for Selected Sites

Variable	Site 1	Site 2	Site 3	Site 4 (control)
pH	8.2	7.2	7.6	8.2
Metal (Lead) (µg/L)	0.12	1.94	0.60	0.11
Herbicide (Glyphosate) (µg/L)	1.45	0.02	0.50	0.02
Pharmaceuticals (Ibuprofen) (µg/L)	0.01	0.01	1.7	0.00

Explain the purpose of the control in the data table. Describe a suitable location where the control water samples could be obtained.

Use the data from the table above to complete the chart below. Match each of the sites numbered above to one of the descriptions of the sampling site below. Explain the reasoning behind one of your choices by making specific reference to the data provided.

Site	Description of sampling site
	Downstream from large city
	Dugout pond on agricultural land
	Tailings pond in industrial area

Compare the difference in the acidity between Sites 1 and 2. Comment on the magnitude difference between the water samples collected from the two sites and its possible implications for the local ecosystem.
The values shown in the table represent different ways to express the concentration of solute within solution. What other units could be used to express the concentration of the different substances shown in this table? Provide a justification for your choice.

Score	Criteria
5 Excellent	The student demonstrates an excellent understanding of all the components of the question and fully and correctly supports those components. Statements made in the response are organized, unambiguous, and supported explicitly, but may contain a minor error or have minor omissions.
4 Good	The student demonstrates a good understanding of all the components of the question and fully and adequately supports those components. Statements made in the response are unambiguous, mostly complete, mostly correct, but may contain errors.
3 Satisfactory	The student demonstrates a basic understanding of the components of the question. Statements made in the response may be disorganized, ambiguous, incomplete, and may lack support.
2 Limited	The student demonstrates a limited understanding of the components of the question. Statements made in the response lack details, clarity, and support.
1 Poor	The student provides a solution that contains relevant statements that begin to answer the question.
0 Insufficient	The response is incorrect and/or totally off topic.

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Date:	Friday, 19 September 2025, 12:08 AM