Biochemistry - - many compounds dissolve in water (separate...

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Biochemistry: Organic Molecules: Carbon -based molecules - Carbon atoms are bonded mainly to atoms of hydrogen , oxygen , and nitrogen , as well as some other atoms - Always contain carbon and hydrogen - Always covalent-bonding Inorganic Molecules: Molecules that do not contain carbon and hydrogen (e.g.: salts, strong acids and bases, metal compounds) - usually ionic-bonding Properties of Water: - resists changes in temperature (in part due to hydrogen bonding) a. calorie : amount of energy required to raise temperature of 1 gram of water by 1 degree Celsius b. other covalently bonded liquids require about half this energy c. important for organisms (mostly water): maintains normal internal temperatures (homeostasis) - Water has a high heat of vaporization high boiling point (100 degrees Celsius) heat of vaporization (energy required to convert water to steam) is 540 calories (very high) energy needed to break hydrogen bonds - Water is the universal solvent:
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Unformatted text preview: - many compounds dissolve in water (separate into ions ) ionic compounds : salts polar covalent compounds- Water is a polar molecule: the negative ends of water molecules are attracted to positively charged ions, and the positive ends of water molecules are attracted to negatively charged ions- Reactivity: water is an important reactant in many chemical reactions, used in the buildup & breakdown of organic macromolecules- Dehydration synthesis (condensation) reactions : formation of a bond with removal of water- Hydrolysis reactions : breaking of a bond by the addition of water- Cushioning: water helps protect certain body organs from physical trauma (example: CSF in brain) Mixtures : 2 or more substances physically intermixed- no chemical bonding occurs between components of a mixture- can often be separated by physical means (unlike compounds, which can only be separated by chemical means...
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This note was uploaded on 12/04/2011 for the course ANTHRO 2000 taught by Professor Monicaoyola during the Fall '10 term at Broward College.

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Biochemistry - - many compounds dissolve in water (separate...

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