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27 Cards in this Set

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adding and subtracting with decimals
look for the # with fewest significant figures to the right of the decimal
adding and subtracting with whole #s
look for the place were both numbers have significant values
muliplying and dividing
round to # of significant figures in the two #'s which is the smallest
accuracy
closeness of measurements to the accepted value
precision
closeness of a set of measurements of the same quantity
SUBATOMIC PARTICLES:
name the following particles which fit the description
determines the type of element
protons
neutral charge
neutrons
negative charge
electrons
determine the atomic number
protons
the nucleus was discovered when______
fired alpha particles @ gold and it bounced off
# of electons =
the number of protons
# of neutrons =
atomic mass - atomic number
used to discover electons
carthode rays
formula for figuring # of electrons each energy level can hold
2n^2
part of an atom which does the bonding
valency/outer shell
ionic bonds
the electrons attract, usually metal + nonmetal
(ONE GIVES AWAY TO THE OTHER)
covalent bonds
sharing of electrons, usually 2 nonmetals
(SHARING)
POLARITY SCALE:
state the numberical bounds for each measure of polarity
ionic
3.3 - 1.7
(100% - 50%)
polar-covalent
1.7 - 0.3
(50% - 5%)
nonpolar-covalent
0.3 - 0
(5% - 0%)
Resonance
refers to bonding in molecules or ions that cannot be correctly represented by a single Lewis structure
name electron levels
1s, 2s, 2p(xyz), 3s, 3p(xyz), 4s, 3d, 4p (xyz), 5s, 4d
solution
homogenous mixture
suspension
the particles are so large in a solvent that they settle unless the mixture is agitated
colloids
particles are between size of those in solutions and suspensions