AS Chemistry Unit 1 Key Words

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Relative Isoptopic Mass
It is the mass of an isotope of an element compared to one twelfth mass of Carbon-12
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Relative Atomic Mass
It is the mean weighted mass of an atom of an element compared with one twelfth mass of Carbon-12
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Relative Formula Mass
Is the relative mass of a formula compared with one twelfth mas Carbon-12, usually used for ionic compounds or giant covalent
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Relative Molecular Mass
It is the relative mass of a molecule compared with one twelfth mass Carbon-12, usually used for covalent molecules
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Avogadro Constant
The number of particles per mole of substance, 6.02 x10^23
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Molar Mass
The mass per mole of a substance, measured in g/mol
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Empirical Formula
The most simple way of writing a formula
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24000cm3 or 24dm3
The volume that one mole of gas occupies at RTP
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Ideal Gas Equation
pV=nRT
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Gas Constant
8.31 JK-1 Mol-1
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Define a Salt
Any chemical compound formed from an acid when a H+ ion from an acid has been replaced by a metal ion or another positive ion eg, NH4 (Ammonium)
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Cation
A positively charged ion, eg Mg2+
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Anion
A negatively charged ion eg Cl-
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Hydrated Compound
Refers to a crystalline compound containing water molecules
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Anhydrous Compound
Refers to a compound containing no water molecules
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Water of Crystallisation
Refers to the water molecules which make a key part of the crystalline structure of a compound
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Atom Economy
It is a measure of the efficiency of a reaction which focuses on the amount of waste product produced
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Percentage Yield
It is a measure of the success or efficiency of a reaction based on the theoretical amount of desired product that should be produced
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Card 2

Front

It is the mean weighted mass of an atom of an element compared with one twelfth mass of Carbon-12

Back

Relative Atomic Mass

Card 3

Front

Is the relative mass of a formula compared with one twelfth mas Carbon-12, usually used for ionic compounds or giant covalent

Back

Preview of the back of card 3

Card 4

Front

It is the relative mass of a molecule compared with one twelfth mass Carbon-12, usually used for covalent molecules

Back

Preview of the back of card 4

Card 5

Front

The number of particles per mole of substance, 6.02 x10^23

Back

Preview of the back of card 5
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