chemistry

Hans-Werner Wanzlick

Hans-Werner Wanzlick 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 Hans-Werner Wanzlick rather than just read about it. In short: Hans-Werner Wanzlick (1917-1988) was a German chemist. A Professor of chemistry at Technische Universität Berlin he is notable for work on persistent carbenes and for proposing the Wanzlick equilibrium between saturated imidazolin-2-ylidenes and their dimers — which he called "das doppelte Lottchen", after a 1949 novel by Erich Kästner about a pair of mischievous twins.

Key takeaways

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

Reference excerpt

Hans-Werner Wanzlick (1917-1988) was a German chemist. A Professor of chemistry at Technische Universität Berlin he is notable for work on persistent carbenes and for proposing the Wanzlick equilibrium between saturated imidazolin-2-ylidenes and their dimers — which he called "das doppelte Lottchen", after a 1949 novel by Erich Kästner about a pair of mischievous twins.

References

Hans-Werner Wanzlick (1958), letter to Linus Pauling (in German). Linus Pauling's Correspondence, item #444.6.

Illustrations

Worked examples

Example 1 — a first encounter with Hans-Werner Wanzlick

Start with the simplest possible case. Write down what Hans-Werner Wanzlick 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 Hans-Werner Wanzlick 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 Hans-Werner Wanzlick 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 Hans-Werner Wanzlick

In research: Hans-Werner Wanzlick 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 Hans-Werner Wanzlick 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: Hans-Werner Wanzlick is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1917 births, 1988 deaths, 20th-century German chemists, so understanding it makes those chapters shorter.
In everyday life: Look for Hans-Werner Wanzlick 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 Hans-Werner Wanzlick in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hans-Werner Wanzlick 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 Hans-Werner Wanzlick out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hans-Werner Wanzlick in simple terms?

Why does Hans-Werner Wanzlick 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 Hans-Werner Wanzlick?

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 Hans-Werner Wanzlick.