HSCI 100 Lecture Notes - Dehydration Reaction, Hydrogen Bond, Relative Atomic Mass

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Matter anything that has weight/takes up space (solid,liq,gas) Molecules atoms bonded together (can be made of same/diff atoms) Atoms smallest units of an element that retain elements physical/chemical properties. Elements basic building blocks of matter that cannot be broken down by chemical means: 92 naturally occurring elements, 90% of human body carbon, nitrogen, oxygen, hydrogen, trace elements (iron) Atomic weight = mass of protons + neutrons + electrons of most stable isotope. Atomic number = number of protons (&neutrons if neutral) Isotope same number of protons, diff # neutrons. Molecule chem structure held together by covalent bonds. Ion atom/group of atoms with +/- electrical charge. Attraction of oppositely charged ions (not sharing electrons) Electrons of covalent bond shared unequally = polar bond: weakest bond, different ends of molecules = different charges. Hydrogen bond = attraction between slightly positively charged h & slightly negatively charged atom near by.

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