give 10 example of combination reaction and explain one example.
A combination reaction is a reaction in which two or more substances combine to form a single new substance. Combination reactions can also be called synthesis reactions. The general form of a combination reaction is:
A+B → AB
Examples are:
1.) Solid sodium metal reacts with chlorine gas to produce solid sodium chloride.
2Na(s) + Cl2(g) → 2NaCl(s)
2.) Sulphur reacts with oxygen to form sulphur dioxide.
S(s) + O2(g) → SO2(g)
3.) Magnesium reacts rapidly and dramatically when ignited, combining with oxygen from the air to produce a fine powder of magnesium oxide.
2Mg(s )+ O2(g) → 2MgO(s)
4.) Sulphur can also combine with oxygen to form sulphur trioxide.
2S(s) + 3O2(g) → 2SO3(g)
5.) 4K(s) + O2(g) → 2K2O(s)
6.) Carbon monoxide reacts with oxygen to form carbon dioxide
2CO(g) + O2(g) → 2CO2(g)
7.) Two compounds may also react to form a more complex compound. A very common example is the reactions of oxides with water. Calcium oxide reacts readily with water to produce an aqueous solution of calcium hydroxide.
CaO(s) + H2O(l) → Ca(OH)2(aq)
8.) SO3(g) + H2O(l) → H2SO4(aq)
9.) Magnesium oxide is combined with carbon to produce magnesium carbon dioxide.
MgO + CO2 → MgCO3
10.) Aluminium is combined with bromine which produces 3 + aluminium iron and 1+bromine iron.
2Al + 3Br → 2AlBr3
Explanation of one example:
One sort of combination reaction that occurs frequently is the reaction of an element with oxygen to form an oxide. Metals and nonmetals both react readily with oxygen under most conditions. Magnesium reacts rapidly and dramatically when ignited, combining with oxygen from the air to produce a fine powder of magnesium oxide.
2Mg(s)+O2(g)→2MgO(s)