tailieunhanh - Chemistry part 3, Julia Burdge,2e (2009)

Hóa học có bước phát triển mạnh và phân hoá vào thế kỷ 19. Những nghiên cứu của Justus von Liebig về tác động của phân bón đã thành lập ra ngành Hóa nông nghiệp và cung cấp nhiều nhận thức cho ngành hóa vô cơ. Cuộc tìm kiếm một hóa chất tổng hợp thay thế cho chất màu indigo dùng để nhuộm vải là bước khởi đầu của những phát triển vượt bậc cho ngành hóa hữu cơ và dược. | Atoms Molecules and Ions The Atomic Theory The Structure of the Atom Discovery of the Electron Radioactivity The Proton and the Nucleus Nuclear Model of the Atom The Neutron Atomic Number Mass Number and Isotopes The Periodic Table The Atomic Mass Scale and Average Atomic Mass Molecules and Molecular Compounds Molecules Molecular Formulas Naming Molecular Compounds Empirical Formulas Ions and Ionic Compounds Atomic Ions Polyatomic Ions Formulas of Ionic Compounds Naming Ionic Compounds Hydrates Familiar Inorganic Compounds Iron Deficiency An estimated 25 percent of the world s population suffers from iron deficiency the most common nutritional deficiency in the world. Iron is necessary for the production of hemoglobin the component in red blood cells responsible for the transport of oxygen. An inadequate supply of iron and the resulting shortage of hemoglobin can cause iron deficiency anemia IDA . Some of the symptoms of IDA are fatigue weakness pale color poor appetite headache and light-headedness. Although IDA can be caused by loss of blood or by poor absorption of iron the most iron absorption can be diminished by certain common cause is insufficient iron in the diet. Dietary iron comes from such sources as disorders such as Crohn s disease and by some medications. meat eggs leafy green vegetables dried beans and dried fruits. Some breakfast cereals such as Total are fortified with iron in the form of iron metal also known as elemental or reduced iron. The absorption of dietary iron can be enhanced by the intake of vitamin C ascorbic acid . When the diet fails to provide enough iron a nutritional supplement may be necessary to prevent a deficiency. Many supplements provide iron in the form of a compound called ferrous sulfate. Elemental iron ascorbic acid and the iron in ferrous sulfate are examples of some of the atoms molecules and ions that are essential for human health. r0n 18 w Capsule . tang Iron dietary Supplement Ji IO This Chapter You Will Lsarn what