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Why is it that alcohol doesn't freeze?

All liquids freeze (turn to solid) just at different temperatures (assuming pressure stays constant). For example (all temps in degrees celsius):
Nitrogen freezes at -210
Ethyl alcohol freezes at -114
Carbon dioxide freezes at -57 (dry ice)
Water freezes at 0
Rocks freeze at 600-1,200, depending on the rock type (lava or magma)
Gold freezes at 1,064
Tungsten freezes at 3,422

The melting point is basically the same as the freezing point but we generally say something 'freezes' when the temperature at which it changes from solid to liquid (or vice versa) is less than that for water (i.e. sub-zero) and 'melts' when higher than water.

The reasons for different freezing/melting points can be complex, especially for non-elementary compounds (e.g. minerals or air) which have different components but the molecular shape and/or atomic valency affects how 'attracted' individual molecules are to each other - the greater the attraction, the more likely they will 'stick' to each other (freeze) at higher temperatures.

Alcohol molecules have a much lower affinity or 'stickiness' than water molecules hence it freezes at a much lower temperature than will be found in a fridge, or for that matter, practically anywhere on the surface of this planet.

Can a blood test detect old and new alcohol use?

Yes, by direct and indirect evidence.Here you'll find comprehensive overviews on all kinds of testing (breath, urine, blood, and hair) for evidence of heavy alcohol use defined as >60 units/week: Alcohol Testing - What are the options?  and Testing to establish a history of excessive alcohol use | Family Law Forensic Testing Specialists |,uk | Blood alcohol levels are very often done to document alcohol intoxication after an on the spot screening breath test tested positive, but they wane quickly, often after 3 hours the levels aren't elevated anymore, see the tables of blood levels after 1, 2, 3, 4, 5 and 6 hours for the units alcohol drunk versus the male's body weight  BAC Tables (Blood Alcohol Content Tables), this links to the women's BAC Tables (Blood Alcohol Content Tables) We also screen for liver functions, if normal the likelihood of having had much alcohol use in the recent past is very, very low: so called negative predictive value of between 83 to 91%.  If abnormal it could also have been for other reasons e.g. non alcoholic fatty liver.  We can also screen blood for "%CDT" = percentage of carbohydrate deficient transferrin see A useful test for monitoring alcohol use: alcohol inhibits the liver from coupling a carbohydrate to transferrin molecules, so somebody drinking alcohol have less than normal normal transferrin molecules linked to a carbohydrate side chain.  These carbohydrate deficient molecules normally make up 1 - 2% of the transferrin found in the body, if higher than 2.6% we consider the person to be a heavy drinker, we find this value of higher in 50 - 70% of the heavy drinkers, conversely, one in every person testing >2.6% isn't a heavy drinker at all (false positive).  It correlates with alcohol use during the last two weeks.For longer periods up to 12 months hair strand testing is done, the interpretation of the result of testing for two alcohol specific markers being ethyl glucuronide EtG and Fatty Acid Ethyl Esther FAEE, althought interpretation of the result can be problematic.  Here they define heavy drinking as >7 units/day.  One can artificially lower the EtG content of the hair by frequently shampooing the hair.

"How Efficiently Does Alcohol Conduct Electricity..."?

Just to throw in an answer that is both correct and actually explained. Alcohol sucks at conducting electricity, as does water. Really really pure water is actually very bad at conducting electricity, and chemists and biologist actually use the resistance as a measure of the purity (ask any practicing chemist or biologist about 18 megaohm pure water and they'll tell you that's the good stuff).

What you need to conduct electricity is free moving charged particles. In solutions that translates to salts. The actual dissociation constant of water and alcohols (e.g. H2O -> H+ + OH-) does generate charges species, but is very small, resulting in very low concentrations, and is barely enough to conduct anything. Although pure alcohol would be even worse than pure water to conduct electricity.

Copper, as any other metal, can basically be thought of as a bunch of ions (Cu2+ in copper's case) sitting in a sea of electrons. All the electrons of all the atoms are shared between all of them, and can move around very fast. Because of that, electrical conduction by all metals is very high, and much higher than even that of a high salt water solution. Copper is used because it's not reactive, not toxic, cheap, and can be easily shaped into wires.

Hey world, what alcohol is Trey Songz referring to when he says "bottle of the rose" in the song "say ahh"?

Could be Wild Irish Rose for that matter. Having not heard the song, and wouldn't listen to it based on the artist's name it isn't my style of music, I can't say what it is. Could be Tequila.