chemistry

Hydrogen telluride

Hydrogen telluride 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 Hydrogen telluride rather than just read about it. In short: Hydrogen telluride is the inorganic compound with the formula H2Te. A hydrogen chalcogenide and the simplest hydride of tellurium, it is a colorless gas.

Key takeaways

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

Reference excerpt

Hydrogen telluride is the inorganic compound with the formula H2Te. A hydrogen chalcogenide and the simplest hydride of tellurium, it is a colorless gas. Although unstable in ambient air, the gas can exist long enough to be readily detected by its rotting garlic-like odour at extremely low concentrations, or by the revolting odour of rotting leeks that it has at somewhat higher concentrations. Most compounds with Te–H bonds (tellurols) are unstable with respect to loss of H2. H2Te is chemically and structurally similar to hydrogen selenide, and both are acidic. The H–Te–H angle is about 90°. Volatile tellurium compounds often have unpleasant odours, reminiscent of decayed leeks or garlic.

Synthesis Electrolytic methods have been developed. H2Te can also be prepared by hydrolysis of the telluride derivatives of electropositive metals. The typical hydrolysis is that of aluminium telluride:

Al2Te3 + 6 H2O → 2 Al(OH)3 + 3 H2Te Other salts of Te2− such as MgTe and sodium telluride can also be used. Na2Te can be made by the reaction of Na and Te in anhydrous ammonia. The intermediate in the hydrolysis, HTe−, can be isolated as salts as well. NaHTe can be made by reducing tellurium with NaBH4. Hydrogen telluride cannot be efficiently prepared from its constituent elements, in contrast to H2Se.

Properties H2Te is an endothermic compound, degrading to the elements at room temperature:

H2Te → H2 + Te Light accelerates the decomposition. It is unstable in air, being oxidized to water and elemental tellurium:

2 H2Te + O2 → 2 H2O + 2 Te It is almost as acidic as phosphoric acid (Ka = 8.1×10−3), having a Ka value of about 2.3×10−3. It reacts with many metals to form tellurides.

Illustrations

Worked examples

Example 1 — a first encounter with Hydrogen telluride

Start with the simplest possible case. Write down what Hydrogen telluride 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 Hydrogen telluride 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 Hydrogen telluride 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 Hydrogen telluride

In research: Hydrogen telluride 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 Hydrogen telluride 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: Hydrogen telluride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Foul-smelling chemicals, Hydrogen compounds, Tellurides, so understanding it makes those chapters shorter.
In everyday life: Look for Hydrogen telluride 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 Hydrogen telluride in 20 minutes

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

Frequently asked questions

What is Hydrogen telluride in simple terms?

Hydrogen telluride is the inorganic compound with the formula H2Te. A hydrogen chalcogenide and the simplest hydride of tellurium, it is a colorless gas.

Why does Hydrogen telluride 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 Hydrogen telluride?

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 Hydrogen telluride.