Question

what is mean by combination reaction ?​

Answer 1

Answer:

When a combination reaction occurs between a metal and a non-metal the product is an ionic solid. An example could be lithium reacting with sulfur to give lithium sulfide. When magnesium burns in air, the atoms of the metal combine with the gas oxygen to produce magnesium oxide. This specific combination reaction produces the bright flame generated by flares.

Combination reactions can also occur in other situations when the two products do not have the same ionic charge. In such a situation, different quantities of each reactant must be used. To denote this in a chemical equation, a coefficient is added to one or more of the reactants so that the total ionic charge of each reactant is the same. For example, Iron (III) Oxide is formed by the following equation: {\displaystyle {\ce {4Fe + 3 O2 -> 2Fe2O3}}}{\displaystyle {\ce {4Fe + 3 O2 -> 2Fe2O3}}}. This is because in this case, Iron has a charge of 3+ while each Oxygen atom in {\displaystyle {\ce {O2}}}{\displaystyle {\ce {O2}}} has a charge of 2-. Oxygen Gas ({\displaystyle {\ce {O2}}}{\displaystyle {\ce {O2}}}) must be used instead of elemental oxygen ({\displaystyle {\ce {O}}}{\displaystyle {\ce {O}}}) because elemental oxygen is a free radical that is unstable and combines with other oxygen atoms to form {\displaystyle {\ce {O2}}}{\displaystyle {\ce {O2}}}.

Another example[check spelling] natural conditions. Likewise, the Hydrogen atoms should be in the form {\displaystyle {\ce {H2}}}{\displaystyle {\ce {H2}}} because {\displaystyle {\ce {H}}}{\displaystyle {\ce {H}}} is an unstable free radical not commonly found in nature; the chemical equation {\displaystyle {\ce {2H + O -> H2O}}}{\displaystyle {\ce {2H + O -> H2O}}} is also generally impossible under natural conditions.

Explanation:

Answer 2

when two or more reactants combine in a reaction to form a single product, it is called combination reaction .