A reaction has two reactants and two products.

Which type of reaction does not fit the descriptive statement?
Select all that apply.

☐synthesis
☐combustion
☐double-displacement
☐decomposition
☐single-displacement

Synthesis

Decomposition

Explanation:

Synthesis involves combining two elements to form a single product

2Mg + O2 —> 2MgO

From the above, two reactants produced one product.

Combustion involves burning substance in the presence of O2 and this produces CO2 and H20. E.g the Combustion of methane.

CH4 + 2O2 —> CO2 + 2H20

From the above, two reactants produced two products

Double displacement reaction is a reaction in which the atoms interchange by the decomposition of the two reactants, to produce new compounds. E.g the neutralisation of acid by a base to form salt and water.

HCl + NaOH —> NaCl + H2O

From the above, two reactants produced two products.

Decomposition involves the break down of a single compound to form two or more elements or compound. E.g the Decomposition of KClO2 to produce KCl and O2

2KClO2 —> 2KCl + 3O2

From the above, one reactant form two products.

Single displacement reaction involves the displacement of less reactive element by a more reactive element from a compound.

Zn + 2HCl —> ZnCl2 + H2

From the above, two reactants produced two products.

We see clearly that synthesis involves two reactants to produce one product and Decomposition involves one reactant to produce two products.

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