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HBS109
lecture 2- Chemical level
Question | Answer |
---|---|
the level of organisation: | chemical & molecular, atoms, cellular, tissue, organ, organ system, and organism level. |
List the four chemical elements that make up most of the body’s mass | nitrogen, hydrogen, oxygen and carbon |
Distinguish between organic and inorganic compounds | organic compunds- (from life) any molecule that contains carbon and hyrdrogen atoms. eg. methane (CH4) = 5 organic compounds. inorganic compound- any molecule that does not contain carbon or hydrogen. (CO2 is an exception) oxygen, h20, |
List the properties of water that make it important for living things | - SOLUBILITY inorganic and organic molecules can dissolve to become a solution. - REACTIVITY medium for chemical reactions or chemical reaction participant. -HIGH HEAT CAPACITY -LUBRICATION |
List the properties of inorganic acids, bases and salts | acid- release H into solutions. hydrolic acid. Base- removes H+ ions from solution. Salts- compound made of ions other than H+ and OH- |
Describe the pH scale | pH- a measure of H+ concentration in solution. neutral=7 acid=<7 basic=>7 |
Identify the normal pH range for human blood | 7.35-7.45 |
Define a buffer | a buffer is compounds that balance the pH of a solution by either adding or removing H+. |
List the five organic compounds | carbohydrate, protein, lipids, nucleic acid, high energy compounds. |