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SWS3022 Exam 3 Study Guide with Complete Solutions

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©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM Page | 2 an organic domain/matrix, in which they move into that organic environment because it is much more compatible with them. b. In regards to synthetic organics: chemicals interact with soil organic matter and slo...

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  • September 16, 2024
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  • 2024/2025
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  • SWS3022
  • SWS3022
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, ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM



SWS3022 Exam 3 Study Guide with
Complete Solutions


Know the two principal chemical elements in organic chemical compounds -

Answer✔️✔️-Carbon & Hydrogen (maybe Oxygen)


Know the two properties that make certain types of organic chemicals highly water

soluble. - Answer✔️✔️-Polarity & Electrical Charge

Understand basically the impediments to water solubility for non-ionic hydrophobic

organic compounds. - Answer✔️✔️-a. Solubility: The ease with which substances

dissolve in water; the degree to which organic contaminants impact soil and water

quality often is related to their water solubility.

b. Non-ionic, non-polar organic chemicals do not possess an electrical charge, nor are

the polar. So they don't share any compatibility with water. Example: Dioxin

Given the relative insolubility of hydrophobic organic compounds, in what type of

substances are they soluble and why? - Answer✔️✔️-a. These types of chemicals are

compatible with carbon-based environments (similar chemically). They are soluble in

environments that are chemically similar to their chemical properties. Carbon-based

compounds dissolve more easily in carbon-based solvents.

Understand how hydrophobic organic chemicals interact with organic colloids in soils. -

Answer✔️✔️-a. An organic colloid has a dense carbon, non-polar uncharged center and

carboxylic, phenolic, and enolic (charged, polar) moleculres surrounding it. They provide


Page | 1

, ©SOPHIABENNETT EXAM SOLUTIONS_2024/2025 Tuesday, September 3, 2024 10:30 AM


an organic domain/matrix, in which they move into that organic environment because it

is much more compatible with them.

b. In regards to synthetic organics: chemicals interact with soil organic matter and slow

or arrest their movement.

i. The lower the water solubility, usually the stronger the interaction, the slower the

chemical movement.

What is partitioning? - Answer✔️✔️-When the chemical will distribute between the

organic and aqueous phases.; The organic colloid behaves like an organic solvent.

Understand the basic relationship between the water solubility of organic chemicals and

the strength of interaction with organic colloids. - Answer✔️✔️-Organic chemicals tend to

partition into the organic domain/sediments. Examples of this are pesticides, DDT, and

Toxaphene. (Persistence).

Understand basically how hydrophobic organic compounds accumulate in organisms. -

Answer✔️✔️-a. These chemicals are highly hydrophobic, so they don't like to be in

aqueous environment; it will accumulate in the fatty tissues of organisms. It will avoid

blood.

b. The "affinity" for carbon-based environments can lead to bioaccumulation, particularly

of poorly water soluble organic contaminants.

c. Lipid Tissue in organisms is principally composed of carbon and hydrogen.

Triglycerides are the most common. They are the main ingredient of fatty, or adipose

tissue, and are stored in fat droplets inside of adipose cells.

d. Hydrophobic organic compounds "prefer" the environment of the lipid tissues

(lipophilic).


Page | 2

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