chemistry

Karen H. Johannesson

Karen H. Johannesson is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Karen H. Johannesson rather than just read about it. In short: Karen H. Johannesson is an American geochemist and professor in the School for the Environment at the University of Massachusetts Boston and the Intercampus Marine Sciences Graduate Program of the University of Massachusetts System.

Key takeaways

Karen H. Johannesson belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Karen H. Johannesson to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Karen H. Johannesson from memory before moving on to harder problems.

Reference excerpt

Karen H. Johannesson is an American geochemist and professor in the School for the Environment at the University of Massachusetts Boston and the Intercampus Marine Sciences Graduate Program of the University of Massachusetts System. She teaches geochemistry and has expertise in environmental geochemistry, biogeochemistry, trace element speciation, geochemical modeling, chemical hydrogeology, reaction path and reactive transport modeling.

Biography Johannesson was born and raised in the Contoocook Valley region of New Hampshire. She received her Bachelor of Science in geology at the University of New Hampshire in 1985. Johannesson then went on to receive a master's degree in 1988 from Boston College in geology and geophysics. She then received her doctorate in hydrology and hydrogeology from the University of Nevada Reno. Johannesson has worked for four universities since receiving her PhD. She worked as an assistant professor at Old Dominion University from 1998 to 2002. After this, she worked as a professor for five years at the University of Texas at Arlington. Her longest position as a professor was at Tulane University as a Cochran Family Professor of Geochemistry and Chemical Hydrogeology, where her laboratory focused on elevated arsenic levels in the groundwater of Ganges Brahmaputra delta and fluxes of trace elements to coastal ocean through groundwater. Currently Johannesson works as a professor of geochemistry at the University of Massachusetts Boston in the School for the Environment. Her research focuses on the chemical speciation and biogeochemical cycling of trace elements in the environment. Johannesson is the author of the book Rare Earth Elements in Groundwater Flow Systems which focuses on the geochemistry of the lanthanide series elements in groundwater environments. It was first published in 2005. Since 2016 Johannesson has served as Co-Editor-in-Chief of the journal Chemical Geology. She has also served as an associate editor for the journal Geochimica et Cosmochimica Acta since 2005 and was an associate editor for American Mineralogist from 2014 until 2017.

Awards and honors In 2015, Johannesson was awarded the Geochemical Society's Clair C. Patterson medal for her research in environmental geochemistry. She became a Fellow of the Geological Society of America in 2010, the International Association of Geochemistry in 2014, and the Geochemical Society as well as the European Association of Geochemistry in 2015.

Publications Some of the more recent work that Johannesson is involved with consists of research on chemicals found in groundwater. An article she had participated in was "Chlorine-salinity as indicator of the chemical composition of groundwater: empirical predictive model based on aquifers in Southern Quebec, Canada". The research aimed to categorize the 12 chemical elements discovered in the groundwater at the location in order to create correlations between the chemicals to salinity levels. Her contribution to environmental studies has resulted in 173 current publications thus far.

References

External links Faculty website Archived 2022-01-04 at the Wayback Machine

Worked examples

Example 1 — a first encounter with Karen H. Johannesson

Start with the simplest possible case. Write down what Karen H. Johannesson claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Karen H. Johannesson before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Karen H. Johannesson ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Karen H. Johannesson

In research: Karen H. Johannesson appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Karen H. Johannesson in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Karen H. Johannesson is common in secondary-school and first-year university syllabi. It links to neighbouring topics 20th-century American chemists, 20th-century American geologists, 20th-century American women scientists, so understanding it makes those chapters shorter.
In everyday life: Look for Karen H. Johannesson outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Karen H. Johannesson in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Karen H. Johannesson means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Karen H. Johannesson out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Karen H. Johannesson in simple terms?

Why does Karen H. Johannesson matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Karen H. Johannesson?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Karen H. Johannesson.