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How is melting point of silicon dioxide lower than melting point of diamond?
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∙ 11y ago
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∙ 11y ago
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Why Does Chlorine or Silicon have a higher melting point?
the further one moves down the periods, the melting point decreases. since sillicon is placed before chlorine, chlorine has lower melting point.
Can Small amounts of water can lower partial melting temperatures in silicate rocks?
The addition of water can lower partial melting temperatures in silicate rocks.
How do you separate sand from sulfur?
Sulfur melts at a much lower temperature than sand. That might be useful. Also, there are solvents which will dissolve sulfur but not silicon dioxide. Finally, there's always the magnifying glass and tweezers method.
Does rubidium have a higher melting point than potassium?
LOWER
How do you think the melting point of salt water compares to that of pure water?
The melting point of salt water is even lower than pure water.
Why does glass melt at a lower temperature than silicon dioxide?
Glass is a mixture, not only silicon dioxide.
What minerals are in light globes?
Silica = silicon dioxide = SiO2 is the only ingredient of quartz glass, often sodium and calcium oxides are added to lower the melting point. Often sodium carbonate and calcium carbonate are used as the metal oxide source and the carbon dioxide escapes into our atmosphere during the melting.
Why might you expect silicon dioxide and carbon dioxide to have similar melting and boling points?
You Ultimately would not expect them to have similar melting and boiling points.This is because Carbon Dioxide is a gas, it might have strong covalent bonds between their atoms but between their molecules they have weak intermolecular forces, therefore these forces are easily overcome during heating in lower temperaturesHowever when you look at Silicon Dioxide, it has a macromolecular structure. In other words the whole solid is actually just one molecule which its atoms are each covalently bonded to each other. Therefore since it has strong covalent bonds between them you would expect them to have extremely high melting and boiling points.Diamond is a macromolecular structure and it has a melting point of 3006 degrees centigrade. You could expect Silicon Dioxide's melting point (and boiling point) to be similarly high.
Why is diamond a unusual non metal?
non-metals have lower density, melting and boiling point but diamond has higher density, melting and boiling point.
Why diamond has a higher melting point than silicon carbide?
The bond energy of Si -C is generally considered to be lower than that of the C-C, so a simple explanation is that diamond has a stronger bond. Both diamond and silicon carbide have a three dimensional network structure. Diamond consists of tetrahedral bonded carbon atoms whereas silicon carbide has many polymorphs (crystal structure which are temperature dependant). As you heat silicon carbide up the crystal structure changes. Silicon carbide does not melt "congruently" to give a liquid of the same composition, it decomposes at around 2700 0C .
Why do covalent compounds have lower mealting points than ionic compouds?
Molecular covalent compounds have lower melting points because the inetrmolecular forces are weaker than ionic bonds. Note that giant covalent structures, such as silicon dioxide, can have very high melting points, the key factor is not simply the nature of the bond.
Why Does Chlorine or Silicon have a higher melting point?
the further one moves down the periods, the melting point decreases. since sillicon is placed before chlorine, chlorine has lower melting point.
Will heat hurt a diamond?
Since diamond has the highest melting point of any mineral, unless you can produce 3820 degrees Kelvin -- 6,416.6º F or 3,547º C, lower temperatures will not affect a diamond.
Do non polar covalent compounds have high or low melting points?
No they have high melting and boiling points. Don't get confused with simple molecular structures such as water and carbon dioxide which have simple covalent structures. When you heat them you are overcoming the forces BETWEEN THE MOLECULES (intermolecular/van der waals forces of attraction), NOT the actual covalent bonds themselves, like the bond betwen the C and either O in carbon dioxide.
What is the melting point of diamond at an atmospheric pressure of 97200 millibars?
If my math is correct, you're asking for the melting point at a distance of about six miles above sea level -- which means you're probably air-born. The melting point of diamond is 3,820 Kelvin. So assuming you have the gear that can produce that temperature at that altitude, you could melt a diamond. Given the altitude, the Kelvin reading might be a little lower.
Do nonmetals have higher melting points or lower boiling points?
lower melting points
Is there any glass made up of sand?
Normally, glass contains SiO2 (sand or silicon dioxide), lime, and soda, added to give it a lower melting point. For precise lab work, where these would contaminate the results, then pure silica glass is used. The addition of boron gives the glass a lower coefficient of expansion, and this gives us such things as Pyrex, glass topped stoves, etc.
