NATS 1610 Lecture Notes - Lecture 19: Hydrogen Atom, Hydrogen Bond, Chemical Polarity
18 Nov 2015
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Document Summary
The physical and chemical properties of water make life possible: the capacity to dissolve or repel substances, adhesion and cohesion, stabilizing effects on temperature, transporting materials. In a liquid form over range of temperature from 0-100 degrees (this range allows water molecules to exist in a liquid form on our planet) In a water molecule- bonding is polar covalent (when distribution of shared electrons in not uniform: the reason of this is that oxygen atom pulls the shared electrons more strongly than the. Hydrogen, so the oxygen side is slightly negatively charged, while the hydrogen sides are slightly positively charged: whole water molecule has no net charge (+ and balance each other) Hydrogen bonds: form by attraction between a hydrogen atom of a polar molecule to the negatively charged end of another polar molecule, can occur between different molecules, or within the same molecule, relatively week. Is a solvent for other polar molecules ,permits chemical reactions.
