BIOS1167 Lecture 2: Week 2 Notes
4 Sep 2018
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Week 2 lecture concepts of body chemistry. Continuously take place in the human body create heat, take in energy. Pure substances > elements eg. copper. Mixtures > homogeneous eg. brass (copper and zinc) Pure substance that cannot be made simpler eg. hydrogen, oxygen, carbon, phosphorus. Compounds: made up of elements combined together chemically. Pure substances produced from the chemical combination of elements (eg. water = hydrogen + oxygen) Has a fixed composition and its own characteristic properties (eg. properties of water are different to the separate properties of hydrogen and oxygen) Naming compounds usually end in (cid:858)ide(cid:859), electropositive element followed by electronegative. Although not the heaviest element present in the body, hydrogen is the most abundant in terms of number of atoms (also most abundant in universe) Atom: smallest part of an element taking part in a chemical reaction. Molecule: smallest part of a pure substance (elements and compounds) H = atom of hydrogen, h2 = molecule of hydrogen.
