Significant Figures + Scientists

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10 Terms

1
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leading zeros

do not count; 0023 & 0.023 have (2) sig fig

2
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captive zeros

always count; 2024, 20.24, 202.4 have (4) sig fig

3
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trailing zeros

significant only if the numerical value has a decimal point; 1.200 has (4) sig fig but 120 has (2) sig fig

4
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sf addition/subtraction

round to the least significant decimal place

5
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sf multiplication/division

round to least # of significant figures

6
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law of mass conservation

everything has to be accounted for

7
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J.J Thompson

Cathode Ray Tube; negatively charged electron & mass:charge ratio

8
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Milikin

Oil Drop; exact charge of the electron

9
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Ernest Rutherford

Gold Foil Experiment; nucleus and proton

10
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James Chadwick

Radiation Experiments; neutron and isotopes