Question

Give an example of a combination rewction which is exothermic​

Answer 1

Combination reactions are always exothermic. For example barium metal and fluorine gas will combine in a highly exothermic reaction to form the salt barium fluoride: Another example is given by magnesium oxide combining with carbon dioxide: Often, reaction can fall into more than one category.

Answer 2

In a combination reaction the atoms and/or molecules do what the name implies: they combine to form the product. Combination reactions are always exothermic. For example barium metal and fluorine gas will combine in a highly exothermic reaction to form the salt barium fluoride:

Ba + F2 -----> BaF2

Another example is given by magnesium oxide combining with carbon dioxide:

MgO + CO2 ----> MgCO3

Often, reaction can fall into more than one category. For example the combustion of magnesium metal is also a combination reaction:

2Mg + O2 ------> 2MgO + Heat.

Hope it helps.

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