Single and Double Replacements

Single Replacement

One substance (metal or nonmetal) is replaced by another substance (metal or nonmetal)

Double Replacement

Always starts with two ionic compounds in an aqueous solution

Must produce a precipitate, water, or a gas

Uses solubility ryles to determine the state of matter of products

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Metal replaces metal

Ex: Fe(s) + CuO2(aq) → Cu(s) + FeO2(aq)

Nonmetal replaces nonmetal

Ex: Cl2(g) + 2KI(s) → 2KCl(s) + I2(g)

Double Replacement example

Pb(NO3)2(aq) + KI(aq) → PbI2(s) + KNO3(aq)

Soluble

solid dissolved in solution; (aq) is used in reaction equation

Insoluble

solid does not dissolve in solution; (s) is used to reaction equation

Insoluble and slightly soluble are often used interchangeably

Since they are used interchangeably, you would use (s)