Questions tagged [metal]

For questions about metals in general and their physical or chemical properties. For characteristic properties and reactions of d and f block metals specifically, use the [transition-metals] and [rare-earth-elements] tags respectively instead.

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ZnO layer as a passivity layer

I have bought a zinc sheet and with SEM I can see a ZnO layer, which is a passivity layer. But when I connect this sheet to a conductive wire, le zn sheet is conductive too. Is that normal ? the ZnO ...
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73 views

reduce size of zinc dust

I am working with zinc dust (particles of 10um). I want to make a stable dispersion of this dust with arabic gum. The problem is that the particles are still too big, the solution rapidly settles.... ...
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870 views

Metal reagent in dehalogenation of vicinal dihalides

In the dehalogenation of vicinal dihalides why can't sodium be taken as a reagent? I understand that zinc is taken because it is reactive and rate of reaction would be considerably high and it ...
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1answer
6k views

What is the difference between activity and reactivity when discussing elements?

I screwed up on a true/false question that stated that lithium is the most active alkali metal. I answered false, because I remembered that the lower you go in this group, the more explosive the ...
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1answer
425 views

What determines malleability of metals? [closed]

I'm designing an aircraft, and certain sections need to hold under a lot of stress. I know that it is the ways the metal crystallizes that effects the mallebility, but does the distance between the ...
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1answer
2k views

What are the effects of storing drinking water in a copper container?

I recently learned that Ayurveda recommends storing drinking water in copper containers for positive health benefits. Upon my simple experimentation, I've noticed the following effects: Water Type :...
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Identity of unknown metal

I wanted figure out what the identity of this scrap metal was. It seems to be some sheet metal but Wikipedia says sheet metal can be made of a variety of metals. My dad said it might be tin so I ...
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Mercury metal: Not toxic?

Now I (and most of us here, I guess) have grown up around "Mercury's toxic! Avoid handling it! Do NOT screw around with this thing, if you value your life" and other equally heartening pieces of ...
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2answers
966 views

Identity a metal based on its properties

A metal X can be cut with a knife. When placed in water, metal X floats and melts. What is X? The options are calcium, copper, magnesium and potassium. I think it can't be potassium because it will ...
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Which side of an aluminum foil should I put in contact with food?

Aluminum foil has two sides: a matte one, and a shiny one. My question is: which one should I put in contact with food? Criteria are lowest risk of toxicity and best qualities for food preservation (...
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1answer
246 views

Painting corroded 9V battery contacts with vinegar

I have an old radio with corroded 9V battery contacts, probably from a battery that corroded though I don't know. I wanted to clean up the contacts with 5% vinegar since that works with pennies, but ...
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At what temperature does charcoal burn?

According to some sources, charcoal burns at temperatures as high as 2600 °C (Wikipedia), others (that seem less reliable) say around 1000 °C. I know that it depends on the air flow, but how high of ...
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593 views

Removing Rust with Coke

I've seen a few videos on cola being used to remove rust, I've tried it myself too so I know that it works. Now the thing that's bothering me is that this apparently contradicts what I've learnt ...
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How can we get the pure mass of an unclean metal?

So I'm facing a small chemistry problem that I can't find a way to solve. I'm not looking for answers, I'm just looking for how can I approach this problem. The problem is as follows : We put 5 ...
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4answers
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How could I cause metal to rust rapidly?

I'm writing a novel set in the mid-nineteenth century. One of my characters needs to cause an iron padlock to rust rapidly, ideally within a matter of hours. The lock doesn't need to rust away ...
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1answer
273 views

Composites of Immiscible Solids - Aluminum and Lead Example

The $\ce{Al}$-$\ce{Pb}$ (aluminium-lead) phase diagram clearly depicts that when cooled from the liquid state, aluminium and lead are not miscible in the solid state, i.e. the crystal structure of ...
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2answers
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Why is copper a better conductor than iron?

Metals are good conductors as the electrons in their outer shell are loose and can plunge out of the atom with the application of the slightest force (voltage). Silver is the best metallic conductor, ...
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3answers
11k views

Are there metals that react with sulfuric acid but not hydrochloric (or vice versa)?

In school practicals introducing the reactions of metals with acids, it seems to be standard (as in this one from the RSC) to use both hydrochloric and sulfuric acid, but with metals which react to ...
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1answer
3k views

What happens to the mobility of Group 1 elements going down the periodic table?

Whilst reading the book, So you want to go to Oxbridge (Third Edition), I noticed that it states that a past question given during an interview for the place on the undergraduate chemistry course (M....
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1answer
3k views

Is metallic sodium a strong base?

Chemical properties: Sodium metal and sodium amide ($\ce{NaNH2}$ ) are strong bases. They react with ethyne to form sodium acetylide with the liberation of hydrogen gas. How can a metal considered a ...
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1answer
4k views

Why alkali metals have bcc structure?

It is well known that metals are typically, well, metallic and usually favor the most dense packing, like hcp or fcc cells. This may be easily rationalized as dense packing of metal ions in a sea of ...
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1answer
147 views

Would sodium metal react differently with aqueous solutions than with pure water?

I know sodium metal reacts violently with water, but what about aqueous solutions (like sodium bicarbonate). Also, what would the reaction kinetics be? I have watched YouTube videos were a small ...
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2answers
374 views

Successive ionization energies (work functions?) for metals

Are there tables for successive ionization energies for metals (like for gases)? All I can find are work functions to remove one electron from the surface of a metal into vacuum (and to keep it there)....
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1answer
10k views

Reaction of Iron with Concentrated and dilute hydrochloric acid

Does Iron react differently with dilute and concentrated hydrochloric acid? A. I know that with dilute hydrochloric acid Iron (II) chloride is formed. B. I read on the internet that with concentrated ...
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1answer
6k views

How to dissolve bronze at room temperature

Is there any way to dissolve about 10 kg of bronze at room temperature? If yes, which substance would be the best to use and how would the reaction look like?
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1answer
991 views

What is activating effect?

In the book "Organic Chemistry" by Morrison and Boyd,It is written that Sodium borohydride cannot reduce weaker electrophiles like esters though Lithium aluminum hydride can reduce esters to ...
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1answer
1k views

How does metallic bonding in alkaline earth metals work?

Metallic bonds are said to be delocalised. Lithium crystals have each lithium atom in direct contact with eight other lithium atoms. Each atom could therefore be in a hybrid of eight chemical bonds ...
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1answer
460 views

How to prevent Ag2O from decomposing to Ag on Aluminum

I have silver oxide in an ink formulation. When I apply it (in small quantities) over aluminum and heat the resulting (to evaporate the solvent), the monovalent silver oxide seems to decompose to Ag. ...
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1answer
2k views

Effects of potassium hydroxide & carbonate on metals?

BACKGROUND I am in the process of restoring an old computer. The problem with the computer is that it has a NiCad battery fitted to the motherboard, which powers a real-time-clock circuit. The NiCad ...
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4answers
37k views

The Reaction Between Nickel and Hydrochloric Acid

Having conducted an investigation involving multiple metals, I have found that nickel refuses to react with concentrated hydrochloric acid. I have even left the reaction overnight and still have seen ...
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2answers
113 views

How can I undo the tarnish on my aluminium headphones?

I thought of cleaning my headphones, which has an outer aluminium casing, with Dettol liquid which I believe has strong oxidising agents. This was a bad idea. It left a tarnish on the aluminium and I'...
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1answer
3k views

Will a Dole Pineapple juice can made out of tin leach the tin into the juice & cause harm? [closed]

I drink a lot of Dole Pineapple juice from the can, because it has no added sugar or ingredients. Can it be harmful because of the tin in the can? I called Dole and the can is not lined.
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682 views

Can a more electropositive metal replaced by a less electropositive one?

I read from this reference that rubidium is extracted by reduction of its chloride with calcium or sodium. How is it possible?. Their electronegativities are much higher than rubidium. I think ...
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1answer
445 views

Alkalide compounds

I have read much more about metallic hydrides but I am totally confused about "inverse alkali hydrides" or "hydrogen alkalides" while reading refer to this. What are these compounds and how do they ...
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1answer
166 views

To Debunk the 9/11 conspiracy, what is the science behind melting of the towers architecture? [closed]

I am wondering what the chemical validity is of jet fuel actually melting the steel beams that held up the twin towers during the September attacks.
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What intrinsic property do metals have that causes their delocalisation?

So I understand that electrons in metals delocalise completely and are free to move around. But my question is, why would something like Nitrogen not delocalise, whereas say Iron or Bismuth does? What ...
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1answer
2k views

Can silver metal be used to electrochemically reduce copper?

I have a solution of copper(II) ions and several cations. I am trying to reduce the copper ions to copper metal with electricity. My Ideas was to use silver as the anode and a copper wire as the ...
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2answers
901 views

Lithium metal not reacting with water

To start off with I want everyone to know that I'm not doing this for nay kind if drugs or anything illegal, just having some fun. So I know that lithium( Li) is the least alkaline metal in group one ...
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129 views

What is the physics/chemistry behind gold dissolution in water/seawater?

Global ocean contains some amount of dissolved gold (around 0.05-0.005 ppb). Is it ions of gold? Is it just suspended atomic gold (like water vapor in gases - just suspended molecules)? Can pure ...
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2answers
2k views

How much pressure does Gallium exert when it freezes?

Assuming the liquid Gallium is in a sealed container, how much pressure will it exert on its container when it freezes?
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1answer
932 views

Formation of Bands in Semi-Conductors

At school, we are learning about semi-conductors and their applications in modern electronics. One of the features of semi-conductors is that there is a small energy gap between the valence and ...
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1answer
3k views

Choose electrolyte for electroplating

I am planning to try electroplating a steel ring with copper, than nickel, and than finally gold. It seems to me that this would be as simple as using a bath of HCl for electrolytes and attaching the ...
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1answer
42 views

For alkali and lanthanide metals, is there a better liquid barrier to oxidation than mineral oil?

Most often mineral oil is used to store, protect reactive metals from oxidation. By far the best choice is to hermetically seal the metal in pure argon or some other inert gas, since, although mineral ...
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1answer
161 views

Powdering aluminum chemically?

I need a fine aluminum powder for many reactions/experiments. Could I dissolve the metal in an acid and then drop it out of solution using a base, or vice versa? What would be the best chemicals/...
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1answer
9k views

Why is the first ionization enthalpy of zinc higher than expected?

The following sentence is stated in my current chemistry book: The first ionization enthalpy of zinc is higher because it represents an ionization from the $\rm 4s$ level. Now zinc does have an ...
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72 views

ZnO spontaneous combustion during transport

I found your contact information researching $\ce{ZnO}$ reactions. I was hoping you could please help me or orient me in the right direction to find an answer to my problem. The company I work for ...
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1answer
3k views

Why does sodium react with water to produce a hydroxide, while zinc produces an oxide?

Sodium belongs to the so-called active metals and produces a hydroxide on contact with water. Zinc produces an oxide. Why is it so? I was given a hint: to read up about electrochemical series. I've ...
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1answer
729 views

Removing aluminum “corrosion?”

I have some aluminum alloy, possibly 6063 or 7050 (no clue really) which has corroded. The finish might be silver-anodized but I doubt it due to the high polish, could be urethane. The item is a ...
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2answers
4k views

Why do the alkali metals form different products upon combustion in air?

From Wikipedia's article on sodium: When burned in dry air, it forms primarily sodium peroxide with some sodium oxide. We know that sodium has a strong reducing capacity, so why does it produce a ...
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1answer
2k views

What is the lowest temperature tungsten starts sublimating at?

What is the lowest temperature tungsten starts sublimating at? I've tried to search in Google but without any luck. For example, $\ce{WO3}$ starts sublimating roughly at $\pu{550 °C}$, according to ...

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