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Does crystalline glass exist? - Chemistry Stack Exchange Manufacturers are permitted to call low-lead or "lead-free" glass "crystal glass" or "crystalline glass" That seems a gross deception in the case that drew my attention, but in glass with similar designs to cut lead glass, perhaps not, although "crystalline" still seems more of a misnomer than "crystal"
inorganic chemistry - Why is sand, sand; and why is glass, glass; While . . . Glass is clear since the sand it is made from has chemicals added to lower the melting point and to make it transparent (by removing some impurities) Sand is composed of everything in the earth, so it is not as transparent as glass Also the small particles deflect light so it is difficult to see a pattern through sand
What is the difference between an amorphous solid and glass? While a glass is generally considered to be a supercooled, configurationally frozen liquid, not all amorphous solids are glasses For example, amorphous silicon is a four-fold coordinated semiconducting solid, much like crystal silicon Liquid silicon is 8-12 fold coordinated with metallic bonding Amorphous silicon has been shown to display a first-order phase transition to both the crystal
How does HF dissolve glass? - Chemistry Stack Exchange By what mechanism does HF proceed in dissolving glass? Why is it the only acid that has this capability? Is it because of the small size and high electronegativity of fluorine?
Is glass an amorphous solid or supercooled liquid? I have been informed that glass is a super-cooled liquid and is also considered to be an amorphous solid Can it be both and, if not, what category does it fall into?
physical chemistry - Why are crystalline solids anisotropic . . . As an example, the speed of light in glass is independent on the direction you look at the sample; thus, glass is an isotropic material In a crystal, however, the speed of light depends on the relative orientation of the sample, thus crystals generally are anisotropic
How Amorphous solids are converted to Crystalline? The crystal nucleates and grows The kinetics are slower, of course, but it happens just like it would in a melt And, generally speaking, the quote from the textbook is, well, wrong - fused silica will remain fused silica at near-human temperatures for longer than we care to watch
decomposition - What are the crystals that have formed around the top . . . The fine crystal certainly looks like slow growth from airborne NH 3 or amines as the other post said, but NH 3 is far more common, depending on which chemicals are stored where in the lab Yes, ammonium nitrate is an explosive, but needs a pretty solid activation energy, so you can just slowly carefully rinse this away with lots of water
Testing for lead in alcohol - Chemistry Stack Exchange The reason for this is that I have many antique crystal decanters and flasks Crystal is made with lead oxide (PbO) added to the glass Normally when crystal is tested, the procedure is to leave pure alcohol (ethanol) in the vessel for a fixed amount of time (like 3 months) and then test the alcohol to see if it has any lead in it