The cup shown below gives an example of tarnish, a muzic-ivan.infoical readjust resulted in by the reaction ofsilver metal via hydrogen sulfide gas. Hydrogen sulfide gas is created by some industrial processes, or as a result of decaying pet or plant materials:

<2 ceAg + ceH_2S ightarrowhead ceAg_2S + ceH_2>

The tarnish deserve to be removed making use of a variety of polishes, however the process likewise gets rid of a small amount of silver in addition to the tarnish.

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Figure (PageIndex1): A tarnished silver cup. (CC BY-NC; CK-12)

A single-replacement reaction is a reaction in which one facet replaces a similar aspect in a compound. The basic develop of a single-replacement (likewise called single-displacement) reactivity is:

In this general reaction, aspect (ceA) is a metal and reareas element (ceB)(additionally a metal) in the compound. When the aspect that is doing the replacing is a nonmetal, it must replace one more nonsteel in a compound, and also the general equation becomes:

(Wright here (ceY) is a nonmetal and also replaces the nonmetal (ceZ) in the compound via (ceX).)

Hydrogen Replacement

Many kind of steels react conveniently through acids and as soon as they carry out so, one of the assets of the reaction is hydrogen gas. Zinc reacts via hydrochloric acid to develop aqueous zinc chloride and hydrogen (figure below).

In a hydrogen replacement reaction, the hydrogen in the acid is reinserted by an energetic metal.

Figure (PageIndex2): Zinc steel reacts with hydrochloric acid to give off hydrogen gas in a single-displacement reactivity.

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(CC BY-NC; CK-12)

Some metals are so reenergetic that they are capable of replacing the hydrogen in water. The commodities of such a reactivity are the metal hydroxide and also hydrogen gas. All team 1 metals undergo this form of reactivity. Sodium reacts vigorously with water to create aqueous sodium hydroxide and also hydrogen (view figure below).