CHEM1 KEYWORDS

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Mass Number (A)
Total number of protons and neutrons in the nucleus of one atom of the element.
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Atomic Number (Z)
Number of protons in the nucleus of an atom.
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Isotope
Element with same atomic number/no. of protons but with a different number of neutrons.
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Ionisation Energy
The enthalpy change to remove 1 mol of electrons from 1 mol of gaseous atoms.
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Relative Atomic Mass
Average mass of one atom of an element ÷ one twelfth the mass of one atom of carbon-12.
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Relative Molecular Mass
average mass of one molecule ÷ one twelfth the mass of one atom of carbon-12.
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Empirical Formula
The simplest whole number ratio of atoms of each element in a compound.
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Molecular Formula
The actual number of atoms of each element in a molecule.
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Structural Formula
The unique arrangement of atoms in a molecule in a simplified form without showing all the bonds.
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Displayed Formula
Shows all the bonds present in a molecule.
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Homologous Series
Family of organic molecules that all contain the same functional group, but have an increasing number of C atoms.
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Functional Group
An atom or group of atoms which, when present in different molecules, casues them to have similar chemical properties.
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Atom Economy
(Mass of desired product ÷ Total mass of reactants) x 100
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Percentage yield
(Act. mass of product ÷ max. theoretical mass of products) x 100
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Ionic Bonding
The electrostatic force of attraction between oppositely charged ions.
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Covalent Bonding
A shared pair of electrons.
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Dative covalent bonding
A covalent bond where the shared pair of electrons originate from one atom.
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Hydrogen Bond
Intermolecular force between lone pair of electrons on a N, O or F atom and a hydrogen atom.
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Electronegativity
The power of an atom to attract electron density from a covalent bond.
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Structural Isomerism
When component atoms are arranged differently in molecules that have the same molecular formula.
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Positional Isomerism
Molecules with the same carbon skeleton and functional group, but with the func. group joined at a different place along the molecule.
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Chain Isomerism
Where there are two or more ways of arranging the carbon skeleton of a molecule.
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Cracking
Large alkanes being broken down into smaller molecules.
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Other cards in this set

Card 2

Front

Number of protons in the nucleus of an atom.

Back

Atomic Number (Z)

Card 3

Front

Element with same atomic number/no. of protons but with a different number of neutrons.

Back

Preview of the back of card 3

Card 4

Front

The enthalpy change to remove 1 mol of electrons from 1 mol of gaseous atoms.

Back

Preview of the back of card 4

Card 5

Front

Average mass of one atom of an element ÷ one twelfth the mass of one atom of carbon-12.

Back

Preview of the back of card 5
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