Module 2 & 3 Definitions: Atoms, Ions and Compounds & Amount of Substance

Module 2: Atoms, Ions and Compounds

Module 3: Amount of Substance

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Atom
The smallest part of an element that can't be broken down into anything simpler in a chemical reaction
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Molecule
Two or more atoms covalently bonded together
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Ion
A charged particle, usually formed when atoms lose or gain electrons
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Compound
Two or more elements bonded together
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Isotope
Atoms of the same element with the same number of protons but a different number of neutrons
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Relative atomic mass
Weighted mean mass of an atom of the element compared to 1/12 of the mass of an atom of carbon-12
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Relative isotopic mass
Mass of an atom of the isotope compared to 1/12 of the mass of an atom of carbon-12
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Avogadro's constant
6.02 x 10^23
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Molecular formula
The number of atoms of each element in a molecule
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Empirical formula
The simplest whole number ratio of atoms of each element in a compound
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Water of crystallisation
Water molecules that are part of the crystalline structure of a compound
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Anhydrous
Containing no water of crystallisation
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Concentration, mol dm^-3
The number of moles of solute dissolved in 1 dm^3 of solution
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Standard solution
A solution of a known concentration
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Stoichiometry
The ratio of the amount, in mol, of each substance in an equation
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Theoretical yield
The maximum possible amount of product that can be produced from a complete conversion of reactants into products
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Actual yield
The amount of product obtained from a reaction
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Limiting reagent
The reagent that is completely used up in the reaction
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Atom economy
(sum of molar masses of desired products / sum of molar masses of all product) x 100
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Other cards in this set

Card 2

Front

Two or more atoms covalently bonded together

Back

Molecule

Card 3

Front

A charged particle, usually formed when atoms lose or gain electrons

Back

Preview of the back of card 3

Card 4

Front

Two or more elements bonded together

Back

Preview of the back of card 4

Card 5

Front

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

Back

Preview of the back of card 5
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