OCR Chemistry definitions - Module 2

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  • Created by: manpandan
  • Created on: 25-04-17 23:04
Isotopes
Atoms of the same element with different numbers of neutrons and different masses
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Relative isotopic mass
The mass of an isotope compared to 1/12th of the mass of an atom of carbon-12
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Relative atomic mass
The weighted mean mass of an atom of an element compared to 1/12th the mass of an atom of carbon-12
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Amount of substance
A quantity that measures the size of entities
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Mole
The amount of a substance that contains 6.02x10^23 particles
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Avogadro constant
The number of particles in each mole of carbon-12 (6.02x10^23)
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Molar mass, M
The mass per mole of a substance, gmol^-1
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Molar gas volume, Vm
The volume per mole of gas molecules at a stated temperature and pressure
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Anhydrous
Containing no water molecules
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Hydrated salt
A crystalline structure containing water molecules
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Water of crystallisation
Water molecules that are bonded into a crystalline structure of a compound
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Orbital
A region around the nucleus that can hold up to 2 electrons, with opposite spins
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Ionic bonding
The electrostatic attraction between positive cations and negative anions
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Covalent bonding
The strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms
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Average bond enthalpy
The average enthalpy change that takes place when breaking 1 mol of a given type of bond in the molecules of a gaseous species by homolytic fission
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Electronegativity
The ability of an atom to attract the bonding electrons in a covalent bond
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Hydrogen bonding
The intermolecular bonding between a lone pair of electrons on a molecule containing N, O or F and the H atom of -NH, -OH or HF
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Other cards in this set

Card 2

Front

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

Back

Relative isotopic mass

Card 3

Front

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

Back

Preview of the back of card 3

Card 4

Front

A quantity that measures the size of entities

Back

Preview of the back of card 4

Card 5

Front

The amount of a substance that contains 6.02x10^23 particles

Back

Preview of the back of card 5
View more cards

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