the higher you go the less atmospheric pressure= a drop in the meltng point i.e things melt at a lower temp
As you go down a group on the periodic table, atoms increase in size because additional electron shells are being occupied, which are further from the nucleus.
Due to the shielding effect from electron shells beneath the outermost shell (between it and the nucleus), there is an additional electron-to-electron repulsion factor that is included in the determination of the combined, effective attraction/repulsion of outermost electrons from the nucleus.
As such, as more electron shells are added, and more of a shielding effect is "felt" by outermost electrons, they move further from the nucleus in terms of relative position, and atomic radius increases.
I read that ammonium nitrate when mixed with water can turn itself cold. It's used with cold packs. Perhaps by altering the concentration it can freeze?
AnswerBecause there is no chemical reaction between the components, they're just dissolved in water. You could, in principle at least, extract all the constituent chemicals (sugar, caffiene, all the myriad polyphenols) from the solution without changing them at all.
A compound would only be created if there was a chemical reaction between the components, for example if you put powdered zinc in sulfuric acid it would form zinc sulphate. You couldn't get the zinc back without somehow chemical reaction to separate the zinc.
The answer above is incorrect. Tea is a mixture of compounds dissolved in water, and is therefore a solution. The statement that a compound would be created only if there was a reaction between the consituents is also just incorrect. The constiuent compounds are chemicals, Tea contains many complex compounds already. If any of them reacted then new, different compounds would be formed. These may or may not be soluble in water and threfore add to the complexity of the solution...but since they don't react, this is really a non issue here.
I looked up the price for a 1" x 12" x 12" piece of both polycarbonate and polyacrylate, and the polyacrylate was significantly cheaper. There were several different types of polycarbonate you could buy in this size, ranging in price between $100 and $300. There was only one kind of acrylic available in the size I specified (cast acrylic) and it was about $50. If instead I chose a 1/2" x 12" x 12" the prices were closer, but the polycarbonate was still more expensive on average. There were even more types of polycarbonate in this size available, ranging from $25 to $155. There were also several types of acrylic in this size, from $15 to $40. NOTE: Prices are from the McMaster-Carr website-- see Web Links to the left of this answer. They have many many shapes and sizes for additional price comparisons if necessary!