method of refining substances based on differences in solubility.
mixture of two or more substances in solution is allowed to crystallize, for example by allowing the temperature of the solution to decrease, the precipitate will contain more of the least soluble substance
the property of a solid, liquid, or gaseous chemical substance called solu
1. Alcohol abuse and drug abuse
What is drug?
A drug is any chemical substance other than food or water that affects the mind or body
Use and Abuse
A socially constructed boundary between acceptable and unacceptable behavior
- The use of any illegal substance
The use of legal substance in away
that violates accepted medical practice
1-7E The weight of a man on earth is given. His weight on the moon is to be determined.
Analysis Applying Newton's second law to the weight force gives lbm 5.210lbf 1ft/slbm 174.32ft/s 10.32lbf 21022=⎟⎟⎠⎞⎜⎜⎝⎛⋅==⎯→⎯=gWmmgW
Mass is invariant and the man will have the same mass on the moon. Then, his weight on the moon will be
lbf 35.8=⎟⎠⎞⎜⎝⎛⋅==22ft/slbm 174.
chemical compound, Oil….
Can be transported by roadway transportation
But………..(그렇다고 경쟁력이 떨어지지 않는다는 것은 말로)
Kind of goods %(total100)
Agriculture, Foresty 10.5
Ore, steel raw materials&products 38.6
Stone% dried materials, soil 10.8
Chemical substances&fertilizer 17.8
Machines, Cars 0.9
Only 22.7% .