The atmosphere shields us from the sun's cancer-causing ultraviolet (UV) radiation and also moderates the earth's climate.
The atmosphere is obviously vital for human existence, but we have nevertheless been polluting it for years.
The atmosphere is obviously vital for human existence, but we have nevertheless been polluting it for years.
The atmosphere can be divided vertically into four m
1. Introduction
Ammonia (NH3) is one of the most familiar compounds of nitrogen and hydrogen as well as one of the world's most valuable industrial and agricultural chemicals. Ammonia is used throughout the industrial world as a valuable fertilizer.
Ammonia and its compounds, primarily ammonium nitrate and other ammonium salts, replenish nitrogen in depleted soils. This greatly increases y
2). The relationship between tourism and terrorism
Terrorism is a political external environment affecting the tourism system and constantly receives. Already mentioned terrorism this tourist system of survival and growth inhibition and tourism schemes terrorism this are likely to occur, the soil. First, terrorism this tourist system, the impact of the three path works through.
The first i
PFCs(Perfluorinated Chemicals)
Manmade chemicals, synthetic
Resistant to heat, water, oil, grease & stains
Stable, extremely resistant to breakdown
Widely used in diverse applications
Economically useful
Electronegativity of Fluorine
Partial charges in the polarized C-F bond
C-F bond
: strongest bond in
organic chemistry
: high energy bond
Two most studied compounds
feces, or eliminated in expired air, or may accumulate in bone, fat, brain, or other tissues.
Lipophillic drugs and metabolites: transport in the blood by lipoproteins and their penetration through the plasma membrane into cells.
xenobiotics: exogenous chemicals in the environment in air, water, food, and soil that may be absorbed into the body through inhalation, ingestion and skin contact