You can tell the difference between synthesis and decomposition reactions in that a decomposition reaction breaks down a single reactant into two or more products and a synthesis reaction is what combines two or more reactants to form a single product.
Synthesis is essentially building up and decomposition is breaking down.
Another name for synthesis reaction is a combination reaction.
Both a combination reaction and synthesis reactions are terms that describe a chemical reaction in which two or more reactants combine to form a single and more complex product.
Synthesis reactions are a chemical process where simple elements or compounds combine to form a more complex product.
Chemical synthesis is the artificial execution of chemical reactions to obtain one or several products.
The process occurs by physical and chemical manipulations and often involves one or more reactions.
In modern laboratory uses, the process is reliable and reproducible as well.
Some examples of synthesis reactions include.
Water: 2 H2(g) + O2(g) → 2 H2O(g)
Carbon dioxide: 2 CO(g) + O2(g) → 2CO2(g)
Ammonia: 3 H2(g) + N2(g) → 2 NH3(g)
Aluminum oxide: 4 Al(s) + 3 O2(g) → 2 Al2O3(s)
Iron sulfide: 8 Fe + S8 → 8 FeS.
Potassium chloride: 2 K(s) + Cl2(g) → 2 KCl(s)
The synthesis of water is a type of chemical reaction in which two molecules of hydrogen (H2) combine with one molecule of oxygen (O2), forming two molecules of water (H2O).
Photosynthesis is also a synthesis reaction where carbon dioxide reacts with water in the presence of solar energy to produce glucose and oxygen.
Photosynthesis can also be recognized as a synthesis reaction because the glucose molecule produced is more complex than the two reactants involved.