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Dimensional analysis
Determines the correct units for a varble in an equation and ensures units and balanced.
Acid
Proton donator. They ionise in water to produce the H+ ion. They have a pH below 7
Base
Proton acceptor. They ionise in water to form OH- ions. they have a pH above 7.
Amphoteric substance
A substabce that can act as both an acid and a base.