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a single replacement reaction is a reaction in which one element takes the place of another element in a compound.

In a single replacement reaction, or single displacement reaction, a single uncombined element replaces another in a compound. Two reactants yield two products. For example when zinc combines with hydrochloric acid, the zinc replaces hydrogen.

Replacement Reactions

A+BC=B+AC

For instance, if magnesium is dropped into a solution of Copper (II) Nitrate, the magnesium will react because it is more active (in other words wants to bond more than the copper does).

If by chance you drop Copper into Potassium Acetate, you will find that no reaction will occur.

Reactivity of Metals (from most reactive to least)

Lithium

Barium

Potassium

Calcium

Sodium

Magnesium

Aluminum

Zinc

Chromium

Iron

Nickel

Tin

Lead

Hydrogen

Copper

Mercury

Silver

Platinum

Gold

1. Alkali metals will always replace hydrogen in cold water

2. Magnesium to iron on the chart will always replace hydrogen in steam

3. Mercury doesn't react with much of anything

4. Metals higher than Hydrogen will always replace it in an acid (Nitric acid, drop zinc (II) in it, and you will recieve H2 + ZnCl2)

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