Questions tagged [oxides]
The oxides tag has no usage guidance.
20
questions
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0answers
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enthalpy of formation group 2 oxides
i understand the the trend for enthalpy of formation of alkaline earth metal oxides should become less exothermic moving down the group as the positive charge density decreases and the strength of the ...
0
votes
1answer
27 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 ...
1
vote
1answer
74 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 ...
1
vote
1answer
35 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 ...
0
votes
1answer
57 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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0answers
20 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?
1
vote
3answers
243 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)
...
5
votes
2answers
169 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 ...
3
votes
2answers
164 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 ...
0
votes
1answer
81 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 (...
0
votes
1answer
339 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 ...
0
votes
1answer
127 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 ...
2
votes
0answers
41 views
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 ...
0
votes
1answer
61 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 ...
-1
votes
1answer
187 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 ...
3
votes
3answers
86 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 ...
2
votes
0answers
49 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
votes
1answer
79 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-...
0
votes
0answers
24 views
Why does the oxides that form change down the alkali metals? [duplicate]
Why does Li2O primarily form when Li has reacted with O2 but the Na2O2 forms for sodium? Moreover, the primary product for the other alkali metals are superoxides instead of oxides and peroxides. How ...
2
votes
2answers
1k 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 ...
