Chemistry
Differentiate between the following :
Synthesis reaction & a substitution reaction.
Answer
| Synthesis Reaction | Substitution Reaction |
|---|---|
| A chemical reaction in which two or more elements or compounds react to form one new compound is called a Direct Combination Reaction or Synthesis Reaction. | A chemical reaction in which an element or radical has replaced another element in a compound is called Displacement or Substitution Reaction. |
| For example: hydrogen + oxygen ⟶ water 2H2 [g] + O2 [g] ⟶ 2H2O [l] | For example: Magnesium + Copper [II] sulphate ⟶ Magnesium sulphate + Copper Mg + CuSO4 ⟶ MgSO4 + Cu |
Related Questions
Select the correct answer from A, B, C, D and E for each statement given below :
A : Ammonia
B : Hydrogen chloride
C : Hydrogen
D : Nitrogen dioxide
E : Nitric oxideState the gaseous product formed, when -
- An active metal reacts with dilute sulphuric acid.
- A metallic nitrate undergoes thermal decomposition giving a coloured gas.
- Two gases one of them neutral, combines by absorption of light energy.
- An ammonium salt reacts with an alkali.
- An exothermic reaction takes place between ammonia and a neutral gas.
Give a balanced equation for each of the following types of reactions :
- A direct combination reaction between phosphorus and a neutral gas.
- A soluble salt of lead formed from an insoluble base by double decomposition – neutralization.
- A thermal decomposition reaction of a salt – which results in the formation of nitrogen gas.
- A synthesis reaction between a metal & a non-metal resulting in formation of an insoluble salt of iron.
- A decomposition reaction of a salt which leaves behind a silvery metal.
Differentiate between the following :
Electrolytic decomposition & photochemical decomposition
Differentiate between thermal decomposition & thermal dissociation.