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Chemistry A-Level
Module 2- Definitions
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Cards (11)
Isotope
Atoms
of the same
element
that have the
same
number
of
protons
but
differing
numbers
of
neutrons.
Relative Atomic Mass
The
weighted mean mass
of an
atom
of an
element
compared
with
1/12
the
mass
of a
carbon-12 atom.
Acid
A
proton donor.
Base
A
proton acceptor.
Alkali
A
soluble base
that
releases
OH
^
-
ions
when
dissolved
in
aqueous solution.
A strong acid
An
acid
where
H^+
ions
completely dissociate
in
aqueous solution.
A
weak acid
An acid where H^
+
ions
only
partially dissociate
in
aqueous solution.
Empirical Formula
The
simplest whole number ratio
of
atoms
within a
compound
Salt
A chemical compound that is
formed
when the
H^+ ion
from an
acid
has been
replaced
by another
metal positive ion
Molecular Formula
The
actual number
of
atoms present
in a
compound
Orbital
A
region
within an
atom
which
holds
up to
2 electrons
with
opposing spins
