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NCEA level 2 CEM terminology (Bonding)
New Zealand
38
Chemistry
Not Applicable
10/06/2020

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Term
anion
Definition
an atom or group of atoms that has gained one or more electrons and thus has a negative charge.
Term
cation
Definition
an atom or group of atoms that has lost one or more electrons and thus has a positive charge.
Term
conductivity
Definition
the ability of a substance to transmit electrical current or heat.
Term
electrostatic attraction
Definition
the attractive force that acts between particles with the opposite electrical charge.
Term
ionic bond
Definition
a chemical bond between positively charged cations and negatively charged anions.
Term
lattice
Definition
a regular, ordered arrangement of ions in three dimensions.
Term
melting point
Definition
the temperature at which a substance changes from a solid-state to a liquid state.
Term
soluble
Definition
the property of a substance describing its ability to form solutions when mixed with a solvent.
Term
Boiling point
Definition
The temperature at which a substance changes from a liquid to a gas.
Term
Bond angle
Definition
The angle formed by three adjacent atoms in a molecule.
Term
Bond dipole
Definition
Positive and negative charges on the atoms sharing a covalent bond caused by a difference in electronegativity between the two atoms.
Term
Covalent bond
Definition
a strong chemical bond formed when a pair of electrons is shared between two atoms.
Term
Electrical insulator
Definition
A substance that does not allow electrical current to flow through it.
Term
Electron repulsion
Definition
A repulsive force caused by the similar negative charge of two or more electrons
Term
Electronegativity
Definition
The measure of an atom's ability to attract electrons in a chemical bond
Term
lewis diagram
Definition
a diagram of a molecule that uses dots to represent valence electrons and lines to represent covalent bonds.
Term
lone pair
Definition
a pair of valence electrons that are not involved in bonding .
Term
melting point
Definition
the temperature at which a substance changes from a solid to a liquid.
Term
miscible
Definition
describes liquids that are able to mix together in all proportions.
Term
molecular dipole
Definition
positive and negative charges on opposite sides of a molecule caused by bond dipoles not cancelling each other.
Term
molecule
Definition
a group of atoms bonded together by covalent bonds, forming a discrete particle with no charge - molecules are neutral.
Term
a non- polar molecule
Definition
a molecule that does not posses a molecular dipole.
Term
octet
Definition
a shell of eight electrons surrounding an atom.
Term
molecule shape
Definition
the orientation in space of the atoms that comprise a molecule.
Term
polar molecule
Definition
a molecule that possesses a molecular dipole.
Term
region of negative charge
Definition
a region around an atom occupied by electrons.
Term
valence electrons
Definition
the outermost shell of electrons in an atom or ion.
Term
3-dimensional
Definition
Extending in three directions
Term
allotrope
Definition
Two or more different physical forms in which an element can exist
Term
covalent bond
Definition
a chemical bond that involves sharing a pair of electrons between atoms in a molecule.
Term
weak intermolecular bond
Definition
Bond (attractive forces) that act between molecules.
Term
endothermic reaction
Definition
a chemical reaction that absorbs heat.
Term
energy diagram
Definition
a graphical representation of the enthalpy changes of the reactants and products of a chemical reaction.
Term
enthalpy change
Definition
the change in energy content of a chemical system.
Term
exothermic reaction
Definition
a chemical reaction that releases heat.
Term
mole
Definition
6.02 x 10^23 particles of a substance.
Term
state change
Definition
a charge of the physical state of a substance.
Term
thermochemical reaction
Definition
a chemical equation showing a defined amount of energy is either absorbed or released.
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