Questions tagged [oxides]

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Why does the basic properties of oxides of transition metal increase downwards?

I was solving questions on d-block elements and I got a question that asked for the order of basic properties of $\ce{ZrO2}$ & $\ce{HfO2}$. Based on what I have learnt, the size of zirconium and ...
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2answers
104 views

How can I make cerium(IV) chloride? [closed]

How can I make CeCl4? I have some ideas but am worried I'm going to mess it up since this is the first time I've worked with lanthanides.
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1answer
40 views

What is the effect of H2O2 on SPIONs?

I have a system contains super paramagnetic iron oxide nanoparticles (SPIONs) either Fe3+ or Fe2+. I need to introduce hydrogen peroxide to the system but i am not sure about its effect to the SPIONs ...
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1answer
110 views

What is/was “uraneous oxide”? Was it an accepted name for a compound or mixed oxides of uranium?

In This National Technical Reports Library page for a 1965 report Method for Coating Actinide Particles in the list of keywords both Uranium compounds and Uraneous oxide are listed. But I don't find ...
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1answer
77 views

Why does radium form a nitride rather than oxide when exposed to air?

The Wikipedia article states: Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride ($\ce{Ra3N2}$)....
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49 views

Oxidising power of oxides of 15th group elements [closed]

In case of oxides of 15th group elements in form of $\ce{M2O3}$ ($\ce{M}$ is the 15th group element), does oxidising power of oxides increase or decrease down the group? I tried to check by comparing ...
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1answer
46 views

How thick is the colored oxide layer on heat treated stainless steel? [closed]

When stainless steel is welded, or just heat treated, it will develop a thicker oxide layer, which in some cases is is rainbow colored, but can become so thick as to appear almost black. From the ...
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1answer
83 views

Explanation of rusting of iron through metallic bonding [closed]

In the diagram , colour representations : [O - oxygen atoms , red dots - electron ] I will explain rusting of iron due to metallic bonding as I have understood from online. Please correct me if I’m ...
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1answer
2k views

Why do only some metals make protective oxide layers?

Almost all Alkali metals and Alkaline Earth metals react with air to form their respective oxides, but why does only Magnesium forms a protective oxide layer? What properties of magnesium oxide allow ...
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31 views

Comparison between bond length of platinum and titanium oxides

This question comes from a problem sheet I recently had. It concerns the fact that Pt-O bond lengths are typically longer than Ti-O ones, even though the radii of the two metals are similar. My ...
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1answer
34 views

Ascorbic acid and aldehydes: Reaction and Influencing Metals

I've researched online and I've read that ascorbic acid can both promote oxidation and reduction depending on the conditions (I've read about trace metals but I've never found which metals affect its ...
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1answer
100 views

MgO as food supplement - solubility in water

A number of magnesium food / sports supplements contain it as MgO - which is practically unsoluble in water. The recommended quantity is somewhere around .3g / day, so not an insignificant amount. How ...
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1answer
37 views

Do antimicrobial abilities of copper boilers decrease over time?

As copper boilers age and develop oxide buildup, does this lessen the copper's antimicrobial abilities in killing bacteria? I was thinking since that coating would be on the copper, there would be ...
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1answer
115 views

Is the lattice point in ZnO crystal structure occupied by the molecule ZnO or the ion O^2-/Zn^2+?

I learnt that ZnO has a hexagonal crystal system. I was expecting that cations or anions would occupy the lattice points in hcp while voids would be occupied by anions or cations respectively. But ...
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23 views

When MnO2 acts as a catalyst to speed up the decomposition of H2O2 what does it actually do? [duplicate]

Everywhere I look it just states that $\ce{MnO2}$ acts as a catalyst but I have yet to find a simple explanation for what it actually does. What is the mechanism involved in simple terms?
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3answers
323 views

What does *oxidizing* have to do with *hydrogen*? [closed]

An oxidizing acid is a Brønsted acid that is a strong oxidizing agent. All Brønsted acids can act as oxidizing agents, because the acidic proton can be reduced to hydrogen gas. (source: Wikipedia) ...
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2answers
311 views

Molecular structure of iodine nonoxide

A question in an exam was as follows: Iodine reacts with ozone gas to form a dark yellow solid $\ce{X}.$ Let the number of lone pair of electrons in un-ionised form of $\ce{X}$ be $m,$ number of lone ...
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2answers
195 views

Why and how is rust forming on moon?

note: @Mithron's proposed duplicate Why can't rust form without water? does not have anything about the conditions on the Moon, so no, it's not a duplicate. Several popular news articles mention ...
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1answer
249 views

Reaction (or lack thereof) between oxygen and halogen gas

I understand that oxygen and halogens are both very electronegative elements and it would makes sense that they don't want to associate with each other at all. However, I know that oxides of halogens (...
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2answers
243 views

Lewis structure of dinitrogen trioxide

I have a confusion related to the structure of $\ce{N2O3}.$ I was taught 1 is the correct one, but I believe 2 is better since it has no formal charge on it. Why is 1 correct and 2 wrong?
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1answer
665 views

Why is phosphorous pentoxide a dehydrating agent?

$$\ce{HNO3 + P2O5 -> 2HPO3 + N2O5}$$ In this reaction, both nitrogen and phosphorus have the same oxidation number before and after the product is formed. Since the $+5$ oxidation of nitrogen is ...
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1answer
235 views

Reaction of Silicon Dioxide with Hydrofluoric Acid [duplicate]

I learnt that $\ce{SiO2}$(Silicon dioxide) doesn't react with any acid except $\ce{HF}$. So what is special about $\ce{HF}$? Why does only $\ce{HF}$ reacts with $\ce{SiO2}$ even though $\ce{HF}$ has a ...
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Liquid storage of transition metal oxides?

Transition metal oxides (TMOs) have a lot of interesting properties, from ferroelectricity to battery applications. Often times you can change the properties with only slight changes of oxygen ...
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1answer
70 views

Silver “polish” with aluminum foil left a hard yellow coat [closed]

I cleaned my silver teapot with the aluminum foil-baking soda-hot water method. Usually this works well on my silver plated flatware. However, this time it left a hard yellowish coating. I was only ...
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1answer
297 views

Iron and copper oxide for thermite

I recently successfully made thermite from iron oxide powder and aluminum powder. However, I have a couple of questions about copper and iron oxides. The kind of iron oxide that is made by ...
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3answers
130 views

Effect of magnetization on oxidation (rusting) of iron

Can magenetizing a piece of iron bar slow-down (or speed-up) the oxidation (rusting) process? In other words have any influence on it ? From what I've looked up( wikipedia, quora), it appears that the ...
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0answers
53 views

Why does 'softening' of lead oxidise only elements other than lead?

In a flowchart describing the steps to refine lead obtained after the reduction step, my book1 gives a short note on the process 'Softening of lead' where the crude lead is melted in the presence of ...
3
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1answer
83 views

The dissociation of hydrogen on UO2 and PuO2 surfaces: Homolytic or heterolytic?

I have seen that $\ce{H2}$ can dissociate on a metal-oxide surface by two methods: Heterolytically, forming a proton-$\ce{O}$ bond ($\ce{OH}$ group) and a hydride-metal bond ($\ce{M-H}$) on a metal-...
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2answers
2k views

Why is Aluminium oxide amphoteric?

I was reading my book, in which it mentioned that aluminium and gallium oxides are amphoteric and and indium and thalium oxide are basic in their properties. But no explanation was given. My main ...
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3answers
76k views

Why are Silicates solid while carbon dioxide is a gas?

I was under the impression that chemistry almost exclusively involves valence electrons because there isn't enough energy to strip off electrons located closer to the nucleus. If that is true, and ...