lecture 2- Chemical level
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| the level of organisation: | chemical & molecular, atoms, cellular, tissue, organ, organ system, and organism level.
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| List the four chemical elements that make up most of the body’s mass | nitrogen, hydrogen, oxygen and carbon
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| 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,
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| 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
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| 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-
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| Describe the pH scale | pH- a measure of H+ concentration in solution.
neutral=7
acid=<7
basic=>7
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| Identify the normal pH range for human blood | 7.35-7.45
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| Define a buffer | a buffer is compounds that balance the pH of a solution by either adding or removing H+.
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| List the five organic compounds | carbohydrate, protein, lipids, nucleic acid, high energy compounds.
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