Chapter 1-2 test

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Chemistry

25 Terms

1
Law of conservation of mass
Matter is not created nor destroyed in any chemical or physical change
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2
law of definite proportions
a chemical compound contains the same elements in exactly the same proportions by mass regardless of the size of the sample or source of the compound
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3
Law of Multiple Proportions
elements can combine in different ratios to form different compounds
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4
Dalton's Atomic Theory
  1. elements are composed of atoms.

  2. atoms of same element are identical, but differ from other elements.

  3. elements can mix together

  4. atoms only change when mixed with other elements

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5
J. J. Thomson
1897 used cathode ray and positively charged plates to discover electrons.

He thought electrons were "stuck" in uniform, positively charged matter to form an atom which was later disproved upon the discovery of the nucleus
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6
Rutherford
Discovered the nucleus, gold foil experiment
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7
Becquerel
discovered radioactivity after noticing that a photographic plate left untouched by the sun changed in color due to uranium
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8
Millikan
Oil drop experiment led to the charge of an electron to be calculated
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9
Bohr
proposed that an electron is found only in specific circular paths, or orbits, around the nucleus
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10
De Broglie
Scientist who suggested that all moving particles had a wave motion associated with them

the flaw was that you couldn't predict the locations of electrons and it didn't account for spin
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11
Schrodinger
quantum mechanical modelH
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12
Heisenberg
it is impossible to know exactly both the velocity and the position of a particle at the same time
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13
1 meter = ____ centimeters
100
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14
1 meter = _____ millimeters
1000
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15
1 meter = ______ nanometers
1,000,000,000
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16
1 meter = ____ kilometers
0.001
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17
1 meter = ____ hectometers
0.01
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18
1 meter = ____ decimeters
10
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19
Accuracy is
the closeness of a measurement to the true value of what is being measured
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20
Precision is
the replicability of a measurement to the same value
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21
Kelvins +
Celsius + 273.15
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22
Density is
mass/volume
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23
Molarity is
moles of solute/liters of solution
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24
When converting cm^3 to any other metric unit of X^3 you always ______ the conversion factor
cube
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25
Celsius from Kelvin
Kelvin - 273.15
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