CHemistry unit 1 key words

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Definition of an isotopes
An atom of the same element with a different number of neutrons and Relative atomic mass
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Define Relative Atomic mass
The mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12
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Define Relative isotopic mass
The mean mass of an isotopes of an element relative to 1/12th of the mass of an atom ofcarbon-12
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Define Relative Formula mass
The mean mass of a formula unit compound relative to 1/12th of the mass of an atom of carbon-12
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Define Relative molecular mass
The mean mass of a molecule relative to 1/12th of the mass of an element of carbon-12
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Define dilute
A small amount of solute in a large quantity of solvent
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Define concentrated
A large amount of solute in a small quantity of solvent
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Define Anhydrous
Without water of crystalisation
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Define hyrous
With water of crystallisation
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Water of crystallisation
The water molecules which form an essential part of a crystal ion structure of a compound
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First ionisation energy
The energy required to remove one electron from one mole of a gaseous atom
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Successive ionisation energy:
The energy required to remove one (to infinity) from one mole of a gaseous uni positive ions to form gaseous di-positive ions
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Ionic compound
Electostatic atrraction between oppositely charged ions
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Covalent bond
Shared pair of electron
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Electronegativity
The ability of an atom to attract the bonding electrons in a covalent bond
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Metalic bonding
The attraction between positive ions and delocalised electrons
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Oxidation
The loss of an electron, increase in oxidation number
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Reduction
The gaining of an electron, decrease in oxidation number
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Card 2

Front

The mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12

Back

Define Relative Atomic mass

Card 3

Front

The mean mass of an isotopes of an element relative to 1/12th of the mass of an atom ofcarbon-12

Back

Preview of the back of card 3

Card 4

Front

The mean mass of a formula unit compound relative to 1/12th of the mass of an atom of carbon-12

Back

Preview of the back of card 4

Card 5

Front

The mean mass of a molecule relative to 1/12th of the mass of an element of carbon-12

Back

Preview of the back of card 5
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