chemistry

Lassar Cohn

Lassar Cohn 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 Lassar Cohn rather than just read about it. In short: Lassar Cohn, Lassar-Cohn or Ernst Lassar Cohn (6 September 1858 – 9 October 1922) was a Prussian chemist and professor at the University of Königsberg who wrote several influential textbooks on organic analysis including methods for the analysis of urine. Cohn was born in the Jewish family of Jacob Marcus Cohen and Hanna Hewe in Hamburg.

Key takeaways

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

Reference excerpt

Lassar Cohn, Lassar-Cohn or Ernst Lassar Cohn (6 September 1858 – 9 October 1922) was a Prussian chemist and professor at the University of Königsberg who wrote several influential textbooks on organic analysis including methods for the analysis of urine.

Cohn was born in the Jewish family of Jacob Marcus Cohen and Hanna Hewe in Hamburg. He studied at the Gymnasium in Königsberg before going the University of Heidelberg. He also studied at Bonn and Königsberg. After receiving a doctorate in 1880 and habilitation in 1888 he joined the University of Königsberg and became a professor in 1894. He worked for some time from 1897 in Munich at the Ludwig-Maximilians-Universität München (LMU Munich), but returned to Königsberg in 1902. In 1907, he also began to work with the chemical industry. Cohn's major works included studies of organic compounds, tartaric acid and its esters, bile chemistry and the recycling of industrial wastes. He innovated methods for nitrogen measurement, saccharimetry, and urine analysis.

References

External links Chemistry in Daily Life (1909) A laboratory manual of organic chemistry (1895) Application of some general reactions to investigations in organic chemistry (1904)

Illustrations

Worked examples

Example 1 — a first encounter with Lassar Cohn

Start with the simplest possible case. Write down what Lassar Cohn 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 Lassar Cohn 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 Lassar Cohn 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 Lassar Cohn

In research: Lassar Cohn 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 Lassar Cohn 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: Lassar Cohn is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1858 births, 1922 deaths, 20th-century biochemists, so understanding it makes those chapters shorter.
In everyday life: Look for Lassar Cohn 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 Lassar Cohn in 20 minutes

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

Frequently asked questions

What is Lassar Cohn in simple terms?

Why does Lassar Cohn 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 Lassar Cohn?

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 Lassar Cohn.