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| the unit of measurements used in chemistry. |
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| international system of units. |
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| force of gravity on an object. |
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| used to help identify the significant digits.in a measurement, divides measurements into two kinds. |
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| scientific notation part: one |
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between one and ten (1-10)
example: 0.00225 is 2.25x10^-3 |
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| scientific notation part:two |
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| power of ten written in exponential form. |
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| if exponent is written as a negative |
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| decimal point moves to the right |
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| decimal point moves to the left when |
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| the exponent is written as a positive |
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| four step problem solving |
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1)analyze
2)plan
3)solve
4)evaluate |
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| shows relationship between 2 experimental values |
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.10 - 2
101- 3
1001- 4
100.00- 5
0.00001- 1
100- 1
10- 1
100.- 3
0.000010- 2 |
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| smallest particle of an element that remains the chemical identity of that element |
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| does not create or destroy matter <- law of constant composition by Joseph Louis Proust in 1799 |
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| radiation comes from a tube |
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| spontaneous emission of radiation from an element |
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| defined by number of protons and neutrons |
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| highest number in which an atom is stable and not radio active |
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| the three forms of radiation |
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| loses 2 protons and 2 neutrons |
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| only electrons, come out of nucleus, being born deformed. neutron is decaying to proton or electron. proton stays electron gets rejected and sent as radiation waves |
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| nucleus @ high energy state rearranges protons and neutrons and the energy left over is sent out. gamma ray has no mass |
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