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Module 8: Applying Chemical Ideas
Quick questions on Why we monitor the environment chemically: HSC Chemistry Module 8
8short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is why monitor at all?Show answer
The environment is a chemical system in which human activity adds species that the natural cycle cannot remove fast enough. Without monitoring, those species accumulate to harmful levels before symptoms appear in plants, animals or people. The three main reasons to monitor are:
What is typical concentration limits (ADWG)?Show answer
To choose the right technique you have to know the order of magnitude expected. Selected ADWG values:
What is qualitative vs quantitative?Show answer
Qualitative analysis identifies what is in the sample. Flame tests, precipitation reactions and complexation tests are qualitative; you observe a colour or a precipitate and conclude the species is present.
What is choosing a technique?Show answer
The choice depends on three things:
What is saying "monitoring detects pollution"?Show answer
Monitoring also confirms that limits are being met, tracks long-term trends and informs policy. It is not just about catching offenders.
What is confusing ppm and ppb?Show answer
1 ppm = 1000 ppb = 1 mg/L (in water). A typical AAS detection limit is a few ppb, not ppm.
What is claiming that flame tests can do quantitative work?Show answer
Standard high-school flame tests are qualitative only. AAS is a quantitative descendant of the flame test idea.
What is forgetting the matrix effect?Show answer
A clean standard solution behaves differently from a real seawater or soil extract. Matrix-matched calibration is part of good practice.