what is combination raction
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it is that type of chemical reaction in which more than two substances combine to form only one substance. .....
example H2+Cl2_____HCL
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Combination Reactions
A combination reaction is a reaction in which two reactants combine to form one product.
Oxygen and the halogens are very reactive elements and are likely to undergo combination reactions with other elements. When a metal undergos a combination reaction with oxygen, a metal oxide is formed (similarily, a metal halide is formed if reacted with one of the halogens). You see the products of this type of reaction whenever you see rust. Rust is the product of a combination reaction of iron and oxygen:
Since this new compound is formed from a metal and a non-metal, it is an ionic compound. The product will be electrically neutral and since you can predict what charge most metal ions will have based on their location on the periodic table and oxygen will have a charge of -2, you can determine the molecular formula for the product.
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 sulphur to give lithium sulphide. 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.
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