Chemistry

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What are isotopes?
Atoms of the same element that have different amounts of neutrons.
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Relative isotopic mass
the mass of an atom compared to one-twelfth of the mass of a carbon-12 atom.
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Relative atomic mass
the weighted mean mass of an atom of an element compared to one-twelfth of the mass of a carbon-12 atom.
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Relative molecular mass
the weighted mean mass of a formula unit compared with one-twelfth of the mass of a carbon-12 atom.
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Avodagro constant
6.02 x 10(23)
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Empirical formula
the simplest whole-number ratio of atoms of each element in a compound. amount/Mr
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Moles and gases
n=v/24(000). Molar volume is the volume per mole of gas molecules.
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Moles and solutions
n=cxv (/1000). Divide by 1000, if volume is in cm.
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Moles and reactions
n=m/Mr.
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Equations
Gas= n=v/24(000). Solution= n=cxv. Solid= n=m/Mr
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Acids
Proton donors. When an acid is added to water, the acid releases H+ ions.
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Bases
Proton acceptor.
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Uses of hydroxides?
Magnesium hydroxide is used for treating acid indigestion. Calcium hydroxide is used as lime to treat acid soils.
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Other cards in this set

Card 2

Front

Relative isotopic mass

Back

the mass of an atom compared to one-twelfth of the mass of a carbon-12 atom.

Card 3

Front

Relative atomic mass

Back

Preview of the front of card 3

Card 4

Front

Relative molecular mass

Back

Preview of the front of card 4

Card 5

Front

Avodagro constant

Back

Preview of the front of card 5
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