chemistry

Scandium(III) hydride

Scandium(III) hydride 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 Scandium(III) hydride rather than just read about it. In short: Scandium trihydride is an unstable molecular chemical compound with the chemical formula ScH3. It has been formed as one of a number of other molecular scandium hydride products at low temperature using laser ablation and identified by infrared spectroscopy.

Key takeaways

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

Reference excerpt

Scandium trihydride is an unstable molecular chemical compound with the chemical formula ScH3. It has been formed as one of a number of other molecular scandium hydride products at low temperature using laser ablation and identified by infrared spectroscopy. Scandium trihydride has recently been the subject of Dirac–Hartree–Fock relativistic calculation studies, which investigate the stabilities, geometries, and relative energies of hydrides of the formula MH3, MH2, or MH.

Properties and bonding Scandium trihydride is a quastrigonal planar molecule with three equivalent Sc-H bonds. (C3v) structure an equilibrium distance between Sc and hydrogen of 182.0 pm, the bond angle is 119.2 degrees. By weight percent, the composition of scandium trihydride is 6.30% hydrogen and 93.70% scandium. In scandium trihydride, the formal oxidation states of hydrogen and scandium are −1 and +3 respectively, because of the electronegativity of scandium is lower than that of hydrogen. The stability of metal hydrides with the formula MH3 (M = Sc-Lu) increases as the atomic number of M increases. Early theoretical studies of ScH3 revealed that the molecule is unstable, the bulk substance is likely to be a colourless gas with a low activation energy toward the conversion into trimeric clusters due to the electron deficient nature of the monomer, not unlike the group 13 hydrides. One major difference, is that the dimer is the most stable cluster for group 13 hydrides. This can be attributed to the distortion caused by the d-orbitals. It cannot be made by methods used to synthesise BH3 or AlH3.

References

Worked examples

Example 1 — a first encounter with Scandium(III) hydride

Start with the simplest possible case. Write down what Scandium(III) hydride 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 Scandium(III) hydride 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 Scandium(III) hydride 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 Scandium(III) hydride

In research: Scandium(III) hydride 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 Scandium(III) hydride 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: Scandium(III) hydride is common in secondary-school and first-year university syllabi. It links to neighbouring topics Metal hydrides, Scandium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Scandium(III) hydride 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 Scandium(III) hydride in 20 minutes

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

Frequently asked questions

What is Scandium(III) hydride in simple terms?

Why does Scandium(III) hydride 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 Scandium(III) hydride?

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 Scandium(III) hydride.