Question

what reaction type is

Cu²⁺ + OH^-   ---> Cu(OH)₂

CuSO₄ x 5H₂O ----> CuSO₄

CuSO₄ ------> CuSO₄ x 5H₂O

NH₄Cl -----> NH₃ + HCl

Reaction Type Options are:

1. Combination, Synthesis or Formation Reaction

2. Decomposition Reaction

3. Single Displacement or Single Replacement Reaction

4. Double Displacement or Double Replacement Reaction

Answer 1

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Cu²⁺ + 2OH^-   ---> Cu(OH)₂

Combination reaction. I balanced the reaction by adding a “2” before the hydroxyl ion. In this way you have the combination of copper(+2) ions and two hydroxyl ions to form a single molecule of Copper(II) hydroxide

CuSO₄ x 5H₂O ----> CuSO₄ + 5H₂O

Decomposition reaction: In the left side of the reaction we have a crystalline hydrated salt which upon a desiccating procedure turns into a dried salt. The procedure requires that the original crystal structure decomposes. Water evaporates when a solid is desiccated but it can be added to balance the reaction as a separate component.

CuSO₄ + 5H₂O ------> CuSO₄ x 5H₂O

Combination reaction: The reverse process to the above reaction. Now water is combining with the solid dry copper sulfate to form a crystalline hydrated salt. Again, to balance the reaction it is necessary to add the 5 mol of water

NH₄Cl -----> NH₃ + HCl

Decomposition reaction: A classic AB ------> A + B decomposition process. The reaction is already balanced. During the decomposition one compound splits apart into two (or more) elements or compounds.

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