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Biology3 Lab2
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atom
the smallest particle of an element that retains all the properties of that element
element
a substance that cannot be decomposed into any other subtances by chemical means
6 major elements that make up 99% of the elements in all living tissue
CHNOPS
atomic number
the characteristic number of protons for each element
capacity for first 4 energy shells:
1st
: 2
2nd
: 8
3rd
: 18
4th
: 32
molecule
a group of chemically combined atoms
diatomic molecule
a molecule composed of a single element and two atoms
compound
a molecule of at least two different elements
chemical bond
a force that holds atoms together
covalent bond
a bond formed when one atom shares electron(s) with another atom.
generally a very strong bond
ionic bonding
when one atom donates an electron to another, resulting in oppositely charged ions
ion
a charged particle
hydrogen bonding
a weak attraction between molecules or parts of very large molecules
enzyme
a substance produced by a living organism that acts as a catalyst to bring about a specific biochemical reaction.
reduces the amount of energy required to complete the reaction ==> increases the speed of reaction
identify the components of chemical reactions
reactants
enzyme
products
chemical reaction components of tyrosinase:
pyrocatechol + oxygen
=== tyrosinase ==>
quinone + water
pH neutral
a substance that has a pH of exactly 7
acid
substances that have a pH of less than 7
an acid releases H ions when placed in water
base
a substance that has a pH of more than 7
bases release hydroxide ions (OH) when placed in water
symbol for a hydroxide ion:
OH
symbol for a hydrogen ion:
H
+
if NaOH is a base, how would it dissociate?
NaOH ==> Na
+
+ OH
-
Author
kjel
ID
138595
Card Set
Biology3 Lab2
Description
Biology3 Lab2
Updated
2/29/2012, 4:57:28 AM
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