chemistry

Strontium carbide

Strontium carbide 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 Strontium carbide rather than just read about it. In short: Strontium carbide (also more precisely known as strontium acetylide or strontium dicarbide) is a salt with chemical formula SrC2. It was first synthesized by Moissan in 1894.

Key takeaways

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

Reference excerpt

Strontium carbide (also more precisely known as strontium acetylide or strontium dicarbide) is a salt with chemical formula SrC2. It was first synthesized by Moissan in 1894. It consists of strontium cations Sr2+ and acetylide anions −C≡C−. Strontium carbide can be formed in an electric arc furnace from strontium carbonate and a reductant, such as a reducing sugar or magnesium metal. Alternatively, carbothermal reduction of strontium oxide with graphite begins around 150 °C and is catalyzed by calcium oxide. Classical organic chemistry syntheses include transmetallation from mercury acetylide or an acid-base reaction between dibenzylstrontium and acetylene, although these techniques often produce complexes with the solvent. Direct formation from the elements has a notional enthalpy of −20 kcal/mol. Nevertheless, strontium carbide may be only metastable when encapsulated in a fullerene. It slowly hydrolyzes in air to acetylene. The material is polymorphic, forming a monoclinic crystal structure akin to calcium carbide II and a black tetragonal phase. Heated to 370 °C, it reversibly converts to a face-centered cubic (fcc) lattice. Yttrium carbide retains the fcc lattice down to room temperature; the difference is a 3eg orbital that strontium lacks the electrons to fill. Cyanamide impurities stabilize one other strontium carbide polymorph, just as they do for calcium carbide. The stabilized calcium carbide polymorph is triclinic, and the strontium carbide polymorph is believed to be so as well. At roughly 1800 °C, strontium carbide melts. It forms a solid solution with europium carbide, as Eu+2 has an almost identical ionic radius to Sr+2. Strontium carbide is a chemical intermediate in an archaic carbon-14 dating technique: burning the material to be dated releases carbon dioxide, trapped as strontium carbonate. Magnesium then reduces the carbonate to strontium carbide and hydrolysis releases acetylene. The radioactive decay of the acetylene can then be observed directly or heating to 600 °C polymerizes the acetylene to benzene for a liquid scintillator. Solid state metathesis of strontium carbide and a (complex) metal oxide gives the corresponding metal carbide and strontium oxide. The latter washes away easily in pure water.

References

Worked examples

Example 1 — a first encounter with Strontium carbide

Start with the simplest possible case. Write down what Strontium carbide 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 Strontium carbide 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 Strontium carbide 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 Strontium carbide

In research: Strontium carbide 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 Strontium carbide 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: Strontium carbide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Acetylides, Strontium compounds, so understanding it makes those chapters shorter.
In everyday life: Look for Strontium carbide 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Strontium carbide in 20 minutes

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

Frequently asked questions

What is Strontium carbide in simple terms?

Strontium carbide (also more precisely known as strontium acetylide or strontium dicarbide) is a salt with chemical formula SrC2. It was first synthesized by Moissan in 1894.

Why does Strontium carbide 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 Strontium carbide?

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 Strontium carbide.