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a substance that can donate or accept a proton. It can act as an acid or a base.
the time required for half the atoms present in an object have undergone radioactive decay and...
substances are seperated by the use of their different boiling points.
a pure substance made of two or more elements.
a model of a gas that obeys the ideal gas law equations under all conditions.
a heterogeneous mixture with a stable distribution of a liquid in another liquid, for example,...