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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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Resistivity of metals [on hold]

Well I know the theory which says that the resistivity of a metal is increased with temperature because the vibration of the individual atoms in the lattice become more violent and that resistivity is ...
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2answers
69 views

Flame Test Spectrograms Not Lining Up With Reality

In my AS Level chemistry class we had tried some DIY spectroscopy of flame tests with the aim of identifying anions in certain salts. We got as far as building the spectrometer inspired by Paper Craft ...
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Transition metals and color

Which one of the following transition metal oxides is NOT colored? a) CuO b) FeO c) TiO2 d) Mn2O3 answer is c. book explains that Ti in TiO2 has no d electrons, which otherwise can undergo energy ...
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1answer
107 views

Why do the f-block elements ( inner transition metals) have an oxidation number of +3? [closed]

The f-block valence electrons understandably include the outermost two from 6s. But why do the f-block elements have an oxidation number of +3, pulling an electron from an inner shell, not even a d-...
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1answer
27 views

How is traditional thermite powder stored such that it doesn’t corrode?

I watched some guy talk about redox reactions. Then he was going to do the good old thermite demonstration. He just had a bottle of thermite mixture. I’m wondering, why didn’t it have a chance to ...
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24 views

Metal colored flame and safety

For Chrismtas I was a given a wonderful gas lighter, that produced a pink flame by heating small metal pads (when the pads are cold, the flame is blue, once they are red hot, the flame is colored). ...
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1answer
516 views

What is the black slag formed when sterling silver is melted with borax? [Edited with images]

What is the black graphite looking slag that is formed when sterling silver is melted with borax? Is there a way to remove it from the surface of the sterling silver? It appears to be indestructible!...
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1answer
36 views

Is the flint used in disposable lighters toxic?

Especially the sparks that result when using them. I heard this from a friend and can't seem to find an answer on Google.
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1answer
2k views

Gaseous metals?

Metals form metallic bonds which explain many of their chemical and physical properties. This is most familiar in the solid state but metallic properties are still quite recognizable in the liquid ...
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2answers
68 views

nickel-copper fabric: shielding viability after being subjected to weathering

I know the solution can be as simple as a well-sealed garbage can, but I am contemplating making a more malleable fabric based faraday-cage-esque contraption. The plan is to use nickle-copper fabric ...
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1answer
55 views

The test of metal hydroxides and metal oxides

Is testing metal oxide different from testing metal hydroxide using a litmus paper?
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0answers
103 views

What happened to this stainless steel tool when exposed to vinegar?

Based on an article I found online about how to disinfect hygiene tools I've been soaking nail clippers and similar items in a mixture of white vinegar, dish soap, and warm water for a few hours in a ...
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0answers
34 views

Gallium - Practical use to remove aluminium

Would gallium pass through aluminium into steel? The situation is two joined pieces of metal. Gallium could be applied to the aluminium to degrade it, for mechanical removal, but would it pass ...
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1answer
62 views

It is possible to create any metal? [duplicate]

This question just popped up in head. There are many things which we are good at. We are good at: constructions. build stuff. destroying things. repairing things. cleaning. But I want also to know, ...
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1answer
55 views

Aluminum and aluminum oxide

I have a new grain mill that I am hesitant to use because the rollers are anodized aluminum. As I understand it the anodized aluminum is actually aluminum oxide and supposedly non-toxic. I realize ...
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2answers
44 views

Materials used in cooktop heating element, and reason for black appearance

I have been interested in the structure of heating elements/coils used in cooktops. I am referring to something such as in the following picture: I have a cooktop at home with such elements, and at ...
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2answers
67 views

How does Nickel harden steel?

Nickel : Does not harden austenitic stainless steel Ease the tempering of martensitic stainless steel Harden maraging steel by forming precipitates I also read people saying that it harden ferritic ...
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1answer
80 views

Recover Solder (Sn-Pb) from wires

I have began to do an "art project" which utilizes solder as main material. While I know that solder is cheap and easily found in multiple shops, I have set my mind on using recycled solder from out ...
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0answers
165 views

What bonding allows chloroaluminate (AlCl4-) to form?

How is $\ce{AlCl4-}$ formed when $\ce{Al}$ only has $3$ electrons in it's outershell. It would be able to give $3$ electrons away with $\ce{AlCl3}$ for it to have a full outershell but how does it ...
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1answer
75 views

Effect of oxidation aluminium reflectivity

Aluminium is a fairly good reflector, but oxidation will reduce it's optical reflective properties. Aluminium is used for reflectors either being deposited on a substrate, or polished and protected ...
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1answer
71 views

What metals have been used in photography?

I'm interested in knowing about the various processes that have been used in chemical photography. As I understand it, most are based on silver. Are there any major ones which have not used silver? ...
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1answer
150 views

How to safely clean tantalum jewelry

I have some tantalum jewelry that I would like to clean. I've tried just soap and water to no success, so I wanted to try one of the standard at-home cleaning methods, like this one that uses foil, ...
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0answers
35 views

Is it environmental to throw ordinary keys in the regular household trash?

I have several keys on my chain that I do not need any more, so I'm thinking about throwing them away, but I'm not sure if it is okay to throw away in the regular household trash. I looked it up to ...
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1answer
94 views

Thermal Conductivity of Calcium Carbonate?

Is Calcium Carbonate (Group 1 and 2) able to conduct heat more than other carbonate (Transition metal) allowing for them to be decomposed faster. The reason I am asking this question is because my ...
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1answer
68 views

Regarding interaction with metal sword and white gas

I have a large sword that is comprised of over 1000 layers of Titanium and High Carbon Steel. I wrapped it in Kevlar Wick and I set it on fire using Coleman White Gas (Camp Fuel) for performances. ...
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108 views

What is this golden looking substance?

I am currently messing around with gallium compromising aluminum. I am using a titalium lock which is just a brand of aluminum padlock and I put a gallium-indium euctic alloy on the surface of it. It’...
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1answer
123 views

Which karat gold is harder, 24 kt or 18 kt?

$\pu{24 kt}$ gold indicates that $24/24$ part of it, i.e. $100\%$ of it is gold. $\pu{18 kt}$ indicates that $18/24$ part of it is gold. As gold is a soft element, I reckoned that $\pu{18 kt}$ gold ...
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1answer
62 views

Terminology for describing nuclei participating in metallic bonds

I've read many times that in metals (for example sodium metal), what constitutes the crystal lattice is an arrange of atoms, since no electron is given or lost, they are just shared between all the ...
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2answers
174 views

In a copper wire, how many electrons does each atom give away?

As an ion, copper can give off 1, 2, 3 or 4 electrons. But it has 1 s electron in the last shell and 10 d electrons. So as a metal, how many of those are delocalised and free to move around, and how ...
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0answers
25 views

Why do we dip noble metals (Ir, Pd) into NaOH for an oxide coating in thermal oxidation?

I've noticed that a common technique for creating a layer of oxide onto palladium or iridium is to dip it into high concentrated NaOH prior to putting it in a furnace for ~800C. I've been reading ...
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2answers
570 views

KCl + CuCl2 in solution, is there a reaction?

I'm wondering if the reaction of $\ce{KCl + CuCl2}$ in solution (aq) will produce any products (have a net ionic equation/solid precipitate)? Using the metal activity series, I see that potassium is ...
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1answer
98 views

Metal reactivity with hot water VS HCL

Does being able to react with hot water take more metal reactivity than being able to react with HCl? To me, it seems like a metal would need to be more reactive to be able to react with hot water ...
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0answers
36 views

Choosing electrodes for corrosive environments

Background I'm building a watering robot for my household plants. For the purpose of measuring the moisture content of the plant I intend to use a resisitive approach where I pass an electric current ...
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1answer
291 views

Dissolution of Lithium in Methanol

Easy question to kick off my chemexchange membership! I'm learning chemistry in my spare time, and fittingly for a video art project I'm doing, decided to try a simple inorganic(?) procedure to make ...
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2answers
67 views

How two neutral atoms are together with no force between [duplicate]

How sodium atoms exist together when they all have unstability due to an extra electron present in their outermost shell? I mean how two neutral atoms Na atoms are existing together in form of white ...
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0answers
85 views

What are metal zip tags and belt buckles made of?

Metal zipper tags and belt buckles melt very easily and can be melted by heating it in the stove for 5 minutes. But other metals like aluminium refuse to melt even after hours. If you leave it ...
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1answer
690 views

Is iron (III) oxide-hydroxide the same as iron (III) hydroxide?

Firstly, the Wikipedia article on iron(III) oxide-hydroxide says that $\ce{FeO(OH).H2O}$ is sometimes described as iron(III) hydroxide ($\ce{Fe(OH)3}$). If that is so, does iron(III) hydroxide not ...
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3answers
63 views

Assay of stainless steel

I frequently need to discriminate between 304 and 316 stainless steel which cannot be done by eye. 304 SS has 18% chromium and 8% nickel 316 SS has 16% chromium, 10% nickel and 2% molybdenum How ...
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0answers
33 views

How is different flame color of alkali metals related to nuclear charge?

Why do different alkali metals produce different flame colors ? According to my teacher,different atoms have different nuclear charge and due to difference in effective nuclear charge,the orbit to ...
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1answer
68 views

Why do metallic elements have a very small band gap while nonmetallic elements have a large band gap?

I recently was going over solid state bonding and conductivity. I was wondering why metallic elements (such as sodium, iron, etc.) have a small band gap / no band gap (as conductors that have the ...
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1answer
59 views

How does bismuth's lone pair affect its properties as a metal and alloy?

Bismuth is really the only metal to exhibit a lone pair in its outermost shell, this means that it and its salts should be a Lewis base. As bismuth can act as a Lewis base, how does this affect its ...
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1answer
499 views

What noble metal is most oxidation resistant? [closed]

To clarify,by noble metals in this case I mean all platinum metals + gold,no copper,silver or rhenium.These noble metals are described as having low reactivity,but which one is least reactive or most "...
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1answer
119 views

Metallic character of bonds?

Why in discussions of percent character of bonds, are only ionic and covalent bondings discussed? Do bonds not have a partial metallic character, and are either metallic and ionic-covalent?
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2answers
49 views

Regenerating a Cobalt Acetate Catalyst

I have an eluent from an ion-exchange column containing Cobalt (II) ions and Chloride ions. In order for the cobalt catalyst to be recycled to the main process, it must be in its acetate form. Is ...
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1answer
222 views

Why does copper gain electrons in redox reactions, when it instead has a tendency to lose them? [closed]

Cu has tendency to lose electrons. But in some redox reactions, it gains 2 electrons and become neutral. Why is it so? How can it gain them?
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1answer
78 views

What is the product of magnesium reacting with carbon?

$$\ce{Mg + C -> X}$$ $$\ce{X + H2O -> Y}$$ Determine unknowns X and Y. Now the problem is I think the answer should be $\ce{X=MgC2}$ and $ \ce{Y=C2H2 + Mg(OH)2}$. But the given answer was ...
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2answers
2k views

Is PbO ionic compound?

In IIT-JAM 2018, There was one question, which one of the following oxides are ionic? There was one option PbO also. According to the official answer key, PbO isn't ionic. Although I know this ...
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1answer
200 views

Does 95.8% silver tarnish as fast 92.5% silver?

I've been trying to find out whether 95.8% (Britannia silver) would tarnish as fast as 92.5% (Sterling silver)? I haven't been able to find much on tarnish for Britannia silver. Given that both ...
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0answers
25 views

Relationship between Yield and Applied Potentials

This question revolves around this question from Atkins' Chemical Principles 5th ed., Chapter 13, Question 13.116: Consider the electroplating of a metal $+1$ cation from a solution of unknown ...
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1answer
134 views

Is it possible to have anions of metals? [duplicate]

I've been wondering if it is possible to have negatively charged metal ions. Most ions tend to have electron configuratons of noble gases. So then is it possible to obtain metal ions from metal atoms ...