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IB Bio Test
Students vs Robb, Round 1
4
Biology
12th Grade
09/17/2008

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Term
What is an ion?
Definition
An atom that has gained or lost electrons
Term
What is the difference between an element, a compound, and a molecule?
Definition
Element - Substance compose of ONE type of atom, cannot be made simpler by chemical means
Compound - Consists of atoms from two or moer different elements in definite proportions
Molecule - Smallest particle of substance that still retains the properties of that substance, consists of two or more atoms
Term
What are the most frequently occuring elemnts in living things?
Definition
C,H,N,O,P,S
Term
What is the importance of water's most dense temeperature?
Definition
Its 4 degrees Celsius, which means water is most dense as a liquid and not as a solid, meaning ice will float over water preventing aquatic organisms from freezing when its cold
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