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14 votes
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If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

A good question, but not sure it's possible, at least by polishing the given structure: if the boride layer is tightly bonded, I'd imagine it would be hard to remove such a layer, leaving the isolated ...
DrMoishe Pippik's user avatar
8 votes

If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

Sure! The example most surface scientists should be familiar with is that of alpha silicon carbide or $\ce{\alpha-SiC}$. Alpha silicon carbide (α-SiC) is the most commonly encountered polymorph, and ...
uhoh's user avatar
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8 votes

If a crystal has alternating layers of different atoms, will it display different properties depending on which layer is exposed?

Undoubtedly yes. Giamello et al.[1] give an example involving a very subtle effect of this nature on a magnesium oxide (100) surface (meaning a square array of magnesium and oxygen atoms lying along ...
Oscar Lanzi's user avatar
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3 votes

Which reaction occurs in calcium vanadate when it comes in contact with water?

If you mean $\ce{Ca}\left( \ce{V}\ce{O_{3}} \right)_{2}$ aka $\ce{Ca} \ce{V_{2}}\ce{O_{6}}$ then $\ce{Ca} \ce{V_{2}}\ce{O_{6}} + 2 \cdot \ce{H_{2}}\ce{O} \to \ce{Ca^{2+}} + 2 \cdot \ce{H_{2}}\ce{V}\ce{...
Kevin Dietrich's user avatar
3 votes
Accepted

Metallic nanostructures exhibiting charge separation

The type of charge separation described in the question has been identified between hydrogen and gold, the latter a relatively electronegative metal, by Chen et al[1]. Hydrogen adsorbed on neat ...
Oscar Lanzi's user avatar
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3 votes
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Does someone know a unique testable questions surrounding 1 of the 5 variables that affect the rate of a chemical reaction?

The greater the surface area, the more accessible the reagent in a heterogeneous reaction. Hence, assuming the same chemical purity, Zn (metal) is less reactive than Zn (shot), and this is less ...
Buttonwood's user avatar
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1 vote

Surface Tension at Critical Temperature and at Boiling point

"As temperature decreases, surface tension increases. Conversely, as surface tension decreases strongly as molecules become more active with an increase in temperature becoming zero at its ...
Poutnik's user avatar
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1 vote

Reaction Rate for Surface Reactions

[OP] For ease of calculation assume an arbitrary site concentration of site species in $\pu{mol/m2}$ and the gas species in $\pu{mol/m3}$. Although this may seem OK, in the theory of heterogeneous-...
Metal Storm's user avatar
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1 vote

Does someone know a unique testable questions surrounding 1 of the 5 variables that affect the rate of a chemical reaction?

My current question is, “Does the physical condition of a catalyst change its effect on a chemical reaction rate?” That is a good question. To make this make any sort of sense, I intend on comparing ...
Karsten's user avatar
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1 vote

Does someone know a unique testable questions surrounding 1 of the 5 variables that affect the rate of a chemical reaction?

Careful using the word unique. The 5 conditions put too much emphasis on catalysts. It is basically 3 conditions: Concentrations, temperature, and adequate mixing. A catalyst changes the mechanism. ...
jimchmst's user avatar
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1 vote

Why is the decomposition of gas on a metal surface at high pressure considered a 0 order reaction?

Well textbook mostly tries to explain a concept in a broader and simple way rather than diving deep into different conditions in which reactions could occur (without giving much details of the ...
Prajas Kulkarni's user avatar
1 vote

How does the silver nucleate on glass in Tollen's reagent mirroring?

You are on the right track, and the question is somewhat answerable. But, there are some problems with the proposed mechanisms of nucleation and—to an extent—the fundamental nature of the question to ...
thelocalsage's user avatar
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