chemistry

Gold phosphide

Gold phosphide 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 Gold phosphide rather than just read about it. In short: Gold phosphides are inorganic compounds of gold and phosphorus. The only known gold phosphide is a metastable gold(I) polyphosphide with the formula Au2P3.

Key takeaways

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

Reference excerpt

Gold phosphides are inorganic compounds of gold and phosphorus. The only known gold phosphide is a metastable gold(I) polyphosphide with the formula Au2P3. Older texts sometimes refer to a binary auric phosphide AuP; this hypothetical compound has not been verified by modern methods such as X-ray crystallography.

Preparation Monoclinic Au2P3 is produced by direct reaction between metallic gold and red phosphorus at high temperatures over multiple days. The reaction produced only Au2P3, with no other compounds observed across a wide variety of Au:P atom ratios. Gold(III) phosphide was purportedly prepared by the direct reaction of spongy gold and phosphorus or by passing phosphine into a solution of auric chloride in ether or alcohol:

AuCl3 + PH3 → AuP + 3HCl

Properties Au2P3 is claimed to decompose in air or with H2O. It has a monoclinic crystal structure.

Related A mixed anion phosphide iodide, Au7P10I, is known to possess a trigonal structure.

References

Worked examples

Example 1 — a first encounter with Gold phosphide

Start with the simplest possible case. Write down what Gold phosphide 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 Gold phosphide 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 Gold phosphide 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 Gold phosphide

In research: Gold phosphide 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 Gold phosphide 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: Gold phosphide is common in secondary-school and first-year university syllabi. It links to neighbouring topics Gold compounds, Hypothetical chemical compounds, Monoclinic crystals, so understanding it makes those chapters shorter.
In everyday life: Look for Gold phosphide 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 Gold phosphide in 20 minutes

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

Frequently asked questions

What is Gold phosphide in simple terms?

Gold phosphides are inorganic compounds of gold and phosphorus. The only known gold phosphide is a metastable gold(I) polyphosphide with the formula Au2P3.

Why does Gold phosphide 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 Gold phosphide?

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 Gold phosphide.