Chemistry Core 1 Definitions

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Relative Atomic Mass
The weighted average mass of an atom of an element, taking into account its naturally occurring isotopes, relative to 1/12th the relative atomic mass of Carbon 12.
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Atomic Number
The number of protons in the nucleus.
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Mass number
The number of protons plus the number of neutrons.
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Isotopes
Atoms with a different number of neutrons but the same number of protons
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Orbitals
A given value within the atom where electrons can be found.
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Relative Molecular Mass
The mass of that molecule compared to 1/12th the relative atomic mass of an atom of Carbon 12.
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Avogadro's Constant (The mole)
The number of atoms in 12g of Carbon 12. 6.022x10^23.
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The Ideal Gas Equation
PV=nRT
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Empirical Formula
The formula that represents the simplest ratio of the atoms of each element present in a compound.
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Formula for number of moles
n=mass/Mr
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Molecular Formula
The actual number of atoms of each element in one molecule of a compound.
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Other cards in this set

Card 2

Front

The number of protons in the nucleus.

Back

Atomic Number

Card 3

Front

The number of protons plus the number of neutrons.

Back

Preview of the back of card 3

Card 4

Front

Atoms with a different number of neutrons but the same number of protons

Back

Preview of the back of card 4

Card 5

Front

A given value within the atom where electrons can be found.

Back

Preview of the back of card 5
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