BIOL 110-111 Lecture Notes - Lecture 2: Chemical Polarity, Electronegativity, Hydrophile

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Four main elements that make up the human body are oxygen, carbon, hydrogen, and nitrogen. Makes up 55-60% of total body mass. Water is a solvent: a solvent is the fluid that a solute dissolves in, water dissolves compounds and molecules in the body. Solutes that dissolve easily in water are called hydrophilic (hydro=water, philic=loving) Solutes that do not dissolve easily in water are called hydrophobic (phobic=fearing) Water molecules have covalent bonds between the hydrogen and oxygen atoms, which means the atoms share electrons to become stable. Most chemical reactions in the body take place in water: in a hydrolysis reaction, water is added to the reaction to break bonds between molecules, in a dehydration-synthesis reaction, water is removed from molecules to create bonds. A hydrogen bond is formed between the slightly negative oxygen atom of one water molecule and the slightly positive hydrogen atom of another water molecule, causing the water molecules to stick together.

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