heme 8
Zn(j) + 2 HCl(o<j)---►Zn C\2(aq) + U2(g)
Zinc Hydrochloric acid Zinc chloride Hydrogen
Figurę 7.5 In a single replacement reaction, an atom or ion replaces an atom or ian in a compound.
O What ^^9^,n the formulas ofthe reactants identify this equation as a single replacement reaction?
In the following single replacement reaction, the halogen chłonne in Group 7A (17) replaces bromine in the compound potassium bromide.
Cl2(s) + 2KB r(s)-- 2KC1(j) + Br2(I)
In a double replacement reaction, the positive ions in the reacting com-pounds switch places.
Double replacement
A B
replace
Two elements each other
For example, in the reaction shown in Figurę 7.6, barium ions change places with sodium ions in the reactants to form sodium chloride and a white solid precipitate of barium sulfate.
Na2S04(<2ę) + BaCl2(aq)-- BaS04(^) + 2NaCl(a<?)
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