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a substance that can act as both an acid and a base.

a substance that can donate or accept a proton. It can act as an acid or a base.

a zigzag, stepped line on the periodic table that separates the metals from the non-metals.

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measures the severity of cyclical fluctuations in the economy. The difference between peak and...

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the distance from the zero point (or equilibrium) to the maximum height or depth of a wave or...

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