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