Ch 2 - Atoms, Ions, & Molecules

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Chemistry

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9 Terms

1
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Law of Conservation Mass
Mass is neither created nor destroyed on a chemical reaction. The mass before and after a chemical reaction does not change
2
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Law of Definite Proportions/ Law of Constant Composition
All samples of a compound have the same composition - the same proportions by mass of the constituent elements
3
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Law of Multiple Proportions
If two elements form more than a single compound, the masses of one element combined with a fixed mass of a second are in the ratio of small, whole number
4
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E is the ...
Elemental symbol
Elemental symbol
5
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Z is the ...
Atomic number and equals the number of protons
Atomic number and equals the number of protons
6
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A is the ...
Mass number and equals the number of protons and neutrons
Mass number and equals the number of protons and neutrons
7
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A - Z equals...
Number of neutrons
Number of neutrons
8
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# is the ...
charge (can be positive, negative, or zero)
charge (can be positive, negative, or zero)
9
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Z - # equals ...
Number of electrons
Number of electrons