chemistry

Urea nitrate

Urea nitrate 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 Urea nitrate rather than just read about it. In short: Urea nitrate is a fertilizer-based high explosive with the chemical formula of CH5N3O4 (or (NH2)2COHNO3) that has been used in improvised explosive devices in Afghanistan, Pakistan, Iraq, and various terrorist acts elsewhere in the world such as in the 1993 World Trade Center bombings. Synthesis Urea nitrate is produced in one step by reaction of urea with nitric acid.

Key takeaways

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

Reference excerpt

Urea nitrate is a fertilizer-based high explosive with the chemical formula of CH5N3O4 (or (NH2)2COHNO3) that has been used in improvised explosive devices in Afghanistan, Pakistan, Iraq, and various terrorist acts elsewhere in the world such as in the 1993 World Trade Center bombings.

Synthesis Urea nitrate is produced in one step by reaction of urea with nitric acid. This is an exothermic reaction, so steps must be taken to control the temperature.

Chemistry

Urea contains a carbonyl group. The more electronegative oxygen atom pulls electrons away from the carbon atom, forming a polar bond with greater electron density around the oxygen atom, giving it a partial negative charge. In a simplistic sense, nitric acid dissociates in aqueous solution into protons (hydrogen cations) and nitrate anions. The electrophilic proton contributed by the acid is attracted to the negatively charged oxygen atom on the urea molecule and the two form a covalent bond. Paired with the spectator nitrate counteranion, it forms urea nitrate.

(NH2)2CO(aq) + HNO3(aq) → [(NH2)2COH]+[NO3]−(s)

History It was discovered in 1797 by William Cruickshank, inventor of the Chloralkali process.

Explosive properties It has a destructive power similar to better-known ammonium nitrate explosives, with a velocity of detonation between 3,400 m/s (11,155 ft/s) and 4,700 m/s (15,420 ft/s). Urea nitrate must be initiated using a blasting cap. The compound has frequently been used by terrorist and criminal groups due to its ease of production and low skill level required for synthesis. This is due to the ease of acquiring the materials necessary to synthesize it, and its greater sensitivity to initiation compared to ammonium nitrate based explosives.

References

External links Media related to Urea nitrate at Wikimedia Commons

Illustrations

Worked examples

Example 1 — a first encounter with Urea nitrate

Start with the simplest possible case. Write down what Urea nitrate 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 Urea nitrate 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 Urea nitrate 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 Urea nitrate

In research: Urea nitrate 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 Urea nitrate 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: Urea nitrate is common in secondary-school and first-year university syllabi. It links to neighbouring topics Explosive chemicals, Nitrates, Organic compounds with 1 carbon atom, so understanding it makes those chapters shorter.
In everyday life: Look for Urea nitrate 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 Urea nitrate in 20 minutes

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

Frequently asked questions

What is Urea nitrate in simple terms?

Why does Urea nitrate 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 Urea nitrate?

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 Urea nitrate.