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accuracy
- how close a value is to a corresponding accepted value
- systematic (determinate) error affects accuracy
- absolute error (measure accuracy) = accepted- measured value
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precision
- ability to produce the same measurement under same condition.
- random error affects precision
- Deviation measures precision, = measured value - mean
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y-axis
dependent variable
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x-axis
independent variable, it changes no matter what happen to the dependent ( year, time)
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% component in mixture
(mass of recovered component/ mass of original in g) * 100%
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total % recovery
(total mass of all recovered component/ mass of original sample)*100%
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ionic bond
metal and nonmetal react
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polar covalent bond
two nonmetals
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formal charge
group#- # of non bonding e - .5 bonding e
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when an atom changes its state, it must_______or ________ an amount of energy that is just equal to the difference between the energies of initial and final states
absorb or emit
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The _______________of an atom is obtained when excited atoms fall from higher to lower energy levels
emission spectrum
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delta E= E upper- E lower =
1.9627*10^5/ delta E
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E n =?
- -1312.04/ n^2 kj/mol
- n= 1,2,3 quantum
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