Chemistry- Definition

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Atomic mass
The weighted average mass of naturally occurring atoms on which carbon 12 has a mass of exactly 12 units
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Molecular mass
The relative mass of one molecule in a compound on a scale of which carbon 12 isotope has an exact mass of 12 units
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Percentage composition
the percentage formula of each element which compares the mass of a substance to the whole
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Empirical formula
The simplest formula ratio that represents whole number ratio of elements in a compound
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Molecular Formula
The actual ratio of atoms present in a molecule or compound
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Electronic configuration
Distribution of electrons
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First Ionisation energy
The energy required to remove one electron from its valence shell when the atom is in gaseous state
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Successive Ionisation Energy
Removing electrons from an atom until only the nucleus is left
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Atomic Orbitals
The region of space around the nucleus which can take up to 2 electrons
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Enthalpy change
The energy exchange between reaction and its surrounding at constant pressure.
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Enthalpy
The heat content of a substance
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Bond Energy
The minimum energy required to break the covalent bonds
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Hess's Law
The total enthalpy change of a reaction is independent with the route of which the chemical reaction takes place as long as the initial and final conditions are the same
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Le Chatlier's Principle
if the system of equilibrium is disturbed, the position of equilibrium will shift in the direction that nullify/ opposes the cause of the disturbance
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Dynamic equilibrium
The reactants and products in forward and backward reaction are continuously reacting at the same time and at the same rate
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lattice
regular, repeating arrangement of atoms,ions or molecules
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Other cards in this set

Card 2

Front

The relative mass of one molecule in a compound on a scale of which carbon 12 isotope has an exact mass of 12 units

Back

Molecular mass

Card 3

Front

the percentage formula of each element which compares the mass of a substance to the whole

Back

Preview of the back of card 3

Card 4

Front

The simplest formula ratio that represents whole number ratio of elements in a compound

Back

Preview of the back of card 4

Card 5

Front

The actual ratio of atoms present in a molecule or compound

Back

Preview of the back of card 5
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