The meaning of 2 Al is two atoms of aluminium.
The reaction is:Fe2O3 + 2 Al = 2 Fe + Al2O3
The reaction is:2 Al + 3 H2SO4 = Al2(SO4)3 + 3 H2
The chemical equation is:2 Al + 3 S = Al2S3
For complete reaction, the equation is 3 H2SO4 + 2 Al = Al2(SO4)3 + 3 H2.
Displacement reaction
The reaction shown is a single replacement reaction between aluminum (Al) and chlorine (Cl). In this reaction, aluminum chloride (AlCl3) is formed by the replacement of chloride ions in chlorine gas with aluminum atoms. The balanced chemical equation for the reaction is 2 Al + 3 Cl2 -> 2 AlCl3.
In the chemical reaction 2AlCl3 equals 2Al plus 3Cl2, the substances Al and Cl2 are called products. They are formed as a result of the chemical reaction between aluminum chloride (AlCl3).
2 H2O is the chemical formula of two molecules of water, not a reaction.
The chemical reaction is:2 K + I2 = 2 KI
The chemical reaction is the following: 2 Al + 3 I2--------2 AlI3
2 Al + 6 HCl = 2AlCl3 + 3H2Aluminum Chloride salt with hydrogen gas emitted.
The chemical reaction is:Br2 + 2 K = 2 KBr