Gowtham
  • Member for 7 years, 1 month
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  • Bengaluru, India
Do only outer electron shells take part in forming chemical bonds?
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14 votes

Great Question. From this article, it seems that extreme conditions of pressure can lead to new type of molecules,bondings and how the electrons participate in the bonding. Under very high ...

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How does chromium help stainless steel prevent rusting?
11 votes

TL;DR Note that the passive layer forms on the surface, there needn't be any change to lattice constant. Chromium needn't migrate , the Cr present on the surface will form the layer to protect it....

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Can water be liquefied or solidified just by adjusting the temperature, regardless of the pressure?
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7 votes

If I actually understood your question correctly, yes there are regions above which there will be only solid state (rather than no solid state). This is limited to the molecular region. The Roman ...

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How does a catalytic poison reduce a catalyst's activity?
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6 votes

Basically the catalytic poison reduces the activity by slowing or inhibiting the reaction by occupying the surface of the catalyst and therefore the surface area available for the reactants reduces. ...

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Why is the melting of ice a spontaneous reaction?
6 votes

When T > 0 °C, ice melts spontaneously; the reverse process, liquid water turning into ice, is not spontaneous at these temperatures. However, when T < 0 °C, the opposite is true. Liquid water ...

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Having trouble understanding the iron-carbon phase diagram
5 votes

For any steel with less than 0.02% carbon we should see only ferrite, and for steel with >0.02% carbon we should see only pearlite. You have got a small misunderstanding here. The maximum solubility ...

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Smoke alarm ion neutralisation
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5 votes

From this paper, found the mechanism for neutralisation, Smoke particle charge interaction When smoke particles enter in the ionization chamber, they are subjected to the electric field ...

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Why is Graphene So Strong?
4 votes

If I understood what strong means, then graphene has high strength because of the 2-D layer structure of carbon atoms. The strength can also be attributed to its $sp^{2}$ hybridisation. Any ...

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Does Gallium (liquid or solid) corrode all forms of brass?
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4 votes

From here Gallium is corrosive to all metals except tungsten and tantalum, which have a high resistance to corrosion. Beta-Brass is embrittled by Gallium Due to its highly reducing character it ...

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When will the mass of the reactant increase while being heated up?
4 votes

The only "special " circumstance I can think of is when the polymer can actually absorb or adsorb moisture or just any gas when it is heated and thus "increasing" the mass somehow.

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When is Serpeck's process preferred over Bayer's process?
3 votes

From this source Baeyer's process: This method is mainly applied when ferric oxide is present as chief impurity. Serpeck's process: This process is used when silica is present in considerable amount ...

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Activation energy and temperature
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3 votes

The two distribution plots shown here are for a lower temperature $T_{1}$ and a higher temperature $T_{2}$. The area under each curve represents the total number of molecules whose energies fall ...

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What is the difference between tempering and hardening metals and their end products?
3 votes

Though the other answer provides a good insight, I think annealing and tempering could have been confused. I will talk with respect to iron-carbon alloys or steel here. Tempering is usually a post-...

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What are the spectroscopic signatures that differentiate triple state water from water at 1 atm?
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3 votes

The triple point of water is point of dynamic equilibrium between three phases of water. Any small change in Pressure or Temperature will lead to one phase regions or two phase lines on the phase ...

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Oxygen Preventing the Formation of Large Organic Compounds?
3 votes

If we take a look at glucose we can see there are oxygen atoms in it, just with extra presence of the hydrogen. The assumption : carbon bonds with oxygen, the electrons are too close to the oxygen, ...

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A misunderstanding about the energy profile of reactions with a catalyst involved
2 votes

A reaction involving more than one elementary step has one or more intermediates being formed which, in turn, means there is more than one energy barrier to overcome. In other words, there is more ...

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Why some compounds form different crystal structure at different temperature?
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2 votes

You are just entering into the field of Polymorphism. I couldnt find any source for Why polymorphism occurs but you can think about it as Energetically favorable structure at a particular temperature. ...

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Why the dilution of solvent doesn't affect the solid phase, in comparison to the liquid phase?
2 votes

Instead of "making the jump" from liquid to gas, the water molecules are trying to stack together into an ice crystal. The salt molecules again get in the way. Think of making a solid as like stacking ...

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Proportion of gases filled in cylinder of sea-divers
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2 votes

From this source Helium is used in scuba tanks to dilute oxygen. Why helium? First, it is chemically inert, that is to say, it does not participate in chemical reactions. Second, helium is much ...

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Contactless non-ferrous metals hardening?
1 votes

From this link I could find a few non-ferrous systems which show quench-induced or stress-induced martensite . Generally non-ferrous systems dont show this behaviour and they are hardened/strengthened ...

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How to temper a non-ferrous metal
1 votes

You have a misconception that tempering is hardening. It is softening done after hardening to relieve stresses, improve ductility and toughness . From this source In nonferrous alloys, eutectoid ...

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Separating metals out of a magnet
1 votes

From this paper, it seems Electrochemical recovery of Neodymium is possible from the Magnet.

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Why are multiple oxidation states useful for a catalyst?
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1 votes

The answer has a lot to do with "what is a catalyst in the first place?" A catalyst is a compound that can affect the rate of a chemical reaction by providing an alternative and lower energy profile ...

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Why is activation enthalpy found and not just rate of reaction?
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1 votes

One of the Factors Influencing reaction rate is given below (Source) Temperature: Usually conducting a reaction at a higher temperature delivers more energy into the system and increases the ...

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Galvanic Cells, theoritical voltage
1 votes

$$Pb^{2+} + 2e^{-}->Pb E_{0}(Pb^{2+}) = -0.1263$$ $$Zn->Zn^{2+} +2e^{-} E_{0}(Zn^{2+}) = -0.76 $$ $$[Zn^{2+}] = 0.1 mol/L [Pb^{2+}] = 10^{-4} mol/L$$ $$Qc= \frac{[Zn^{2+}]}{[Pb^{2+}]}$$ $$...

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Wavelength extention in AAS
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0 votes

From this source broadenings occur due to Doppler effect This effect arises because atoms will have different components of velocity along the line of observation. Lorentz effect This ...

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