Explanation:
18. __Double displacement__ 2LiBr + Pb(NO₃)₂ → PbBr₂ + 2LiNO₃
In a double displacement reaction, there is an actual exchange of partners to form new compounds.
The driving condition for this kind of reaction are:
- formation of an insoluble compound called precipitate
- formation of water or any other non-ionizing compound
- liberation of a gaseous product.
Learn more:
Precipitation reaction brainly.com/question/1870098
19. ___Single displacement___ Fe + 2HCl → FeCl₂ + H₂
In a single displacement reaction, one substance replaces another.
- The replacement of a metallic ion in solution by a metal higher in the activity series than the metal in solution falls into this category.
- The positions of the two elements in the activity series serves as the driving force.
Learn more:
Chemical reactions brainly.com/question/3953793
20. ___Synthesis___ CaO + H₂O → Ca(OH)₂
Synthesis is a combination reaction
- This reaction involves the formation of a single product from two or more reactants.
- A compound forms from the union of two or more reactants
- The large and negative heat of formation of the product is the driving force for this reaction.
Learn more:
Synthesis brainly.com/question/2761166
21. ______Decomposition__ NiCl₂ → Ni + Cl₂
In a decomposition or cracking reaction, two or more product forms from a single reactant.
The breakdown of a compound into its component individual elements or other compounds fall into this category.
- The driving force for this reaction is the high heat of formation of the compound and the extreme instability of the compound.
- A stable compound can also be decomposed on heating and applying pressure.
Learn more:
Thermal decomposition brainly.com/question/11181911
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