A metal is an element, compound, or alloy that is a good conductor of both electricity and heat.
0
votes
0answers
9 views
Find a solution to corrode gamma-alumina fast enough
I've tried sulfuric acid, hydrochloric acid, nitric acid, which are all too slow. Hydrogen fluoride reacts fast with gamma-alumina but it also reacts with silica which is not what I expect. Phosphoric ...
0
votes
1answer
30 views
Are metals hydrogen bond acceptors or donors?
In a carbonyl or -OH group, it's clear the oxygen acts as a hydrogen bond acceptor.
Do metals act as hydrogen bond acceptors or donors and if so, how can I tell as what it's acting?
0
votes
0answers
29 views
Why is lithium likely to explode when burnt on non-metal surfaces only?
In this YouTube video (scrolled to 3:27) the researchers rip apart a battery and extract a thin sheet of lithium. At 3:27 they set the metal sheet on fire by putting it onto some metal part and ...
1
vote
1answer
30 views
Are there any free electrons in metal vapor?
Metals contain free moving electrons, in both the solid and liquid state. Does this happen when it is in vapor form?
0
votes
3answers
54 views
How does Caesium's density change with temperature?
According to Wikipedia Caesium's density is 1,90 g/cm3 at T=20 °C. How does this change when T changes? E.g. will it expand when melting?
1
vote
1answer
64 views
Is At a non metal or a metalloid?
Is Astatine a non metal or a metalloid?
A metalloid is an element which exhibits some of the properties of a metal as well as those of a non metal.
1
vote
1answer
35 views
Metal extraction by pyrolysis
There is a process named solar furnace pyrolysis which is used to reduce the oxides of various elements by concentrating solar energy. Oxygen is liberated but an oxide slag is left.
$\ce{SiO2 -> ...
0
votes
0answers
36 views
The science of fireworks [closed]
1) A simple equation for the reaction:
$$ \ce{2KNO3 (aq) + C (s) + S (s) -> K2S (s) + N2 (g) + 3 CO2 (g)}$$
The oxidation number of carbon increases from 0 to +4. The oxidation number of nitrogen ...
2
votes
1answer
559 views
What is charge density?
For example, Magnesium has a higher charge density compared to Sodium, therefore its metallic lattice is stronger and it has a higher melting point. Does that mean that Magnesium has more protons and ...
4
votes
3answers
96 views
Completely chemically inert metal alloy?
Background:
I was a chemistry major and have recently started watching this series of videos by NurdRage.
I learned that Platinum dissolves in Aqua Regia but Ruthenium is only attacked by high ...
2
votes
1answer
46 views
Alloy-component weight based on desired molecule
I'm a gold smith and I want to start experimenting with non-standard metal-alloys. Now high school is a long time ago for me so while I think I've got this right, I'm just not as sure as I should be ...
6
votes
1answer
256 views
5
votes
1answer
109 views
Treatment of copper (0) with sodium hydroxide
I recently made self-assembled monolayers (SAMs) of alkanethiols on a copper substrate. After scrubbing off the $\small{\ce{Cu2O}}$ top layer and rubbing the surface with ether and ethanol, I let my ...
2
votes
1answer
49 views
Materials used in metallic glass
I've been looking over the lists of materials used together to make metallic glass.
Is it purely coincidental that if you round up/down any decimals from the atomic weight of elements used to ...
3
votes
2answers
104 views
Why does polonium form acidic oxides?
All metals form basic oxides. Metallic oxides are basic in character.
Polonium is a metal, so it should form basic oxides but it forms acidic oxides. Why are its oxides acidic in character?
2
votes
1answer
299 views
Galvanic corrosion between nickel brass nut and stainless bolt
I am planning to install something on a boat that will be in salt water, and my question is, will the nickel plated brass fastener not corrode if I connect it to stainless steel?
I looked it up on ...
5
votes
1answer
125 views
Why does Chloride attack CrO?
In certain applications some sorts of stainless steel (V2A, 1.4301) corrode when exposed to $\small{\ce{Cl^-}}$ in water, or at least it is strongly advised to use ...
4
votes
1answer
170 views
Mercury, amalgams and mercury compounds [closed]
Mercury is toxic. It forms amalgams and inorganic mercury compounds/salts are available.
My question is on toxicity. I am interested in its toxicity, not the mode of action (as it will be part of ...
16
votes
2answers
2k views
What makes some metals melt at higher temperature?
I'm looking at the melting temperature of metallic elements, and notice that the metals with high melting temperature are all grouped in some lower-left corner of the $d$ block. If I take for example ...
4
votes
2answers
121 views
How to differentiate a metal from its ion?
I am working on metal and its ion. The problem is, I would like to know whether the metal has been converted to its ionic form or not.
The hypothesis for the analysis is: Metals are good conductors ...
