it's a physical reaction because you can get it back to copper oxide
The reaction between Copper II hydroxide and heat is a decomposition reaction. When heated, Copper II hydroxide breaks down into copper oxide and water vapor.
Copper and oxygen can form various multivalent metal ions in ionic compounds. For example, copper(I) oxide (Cu₂O) and copper(II) oxide (CuO) are ionic compounds where copper exists in different oxidation states. These compounds are formed by the reaction of copper ions with oxygen ions to achieve stability through the transfer of electrons.
The reaction represented is a double displacement reaction, where the metal oxide and nonmetal oxide react to form a ternary salt. In this reaction, the metal from the metal oxide replaces the cation in the nonmetal oxide to form the salt.
It is a hydration reaction.
A metal oxide reacting with a nonmetal oxide typically results in the formation of a salt. This reaction can be classified as a synthesis or combination reaction, where the metal cation from the metal oxide combines with the nonmetal anion from the nonmetal oxide to form a salt.
A single-displacement reaction occurs where copper replaces silver in the silver nitrate solution to form copper(II) nitrate and solid silver. The blue color of the copper(II) nitrate solution turns a greenish-blue color due to the presence of excess copper ions.
The reaction between water and metal oxide to form metal hydroxide is a chemical reaction. Specifically, it is a type of reaction known as a metal oxide reaction, where a metal oxide reacts with water to produce a metal hydroxide. This reaction is often exothermic and can involve ions transferring between the compounds.
synthesis
Heating copper sulfate pentahydrate leads to a dehydration reaction, where water molecules are removed from the compound. This results in the formation of anhydrous copper sulfate.
The reaction you described is a metathesis reaction involving the formation of a ternary salt. Metathesis reactions involve the exchange of cations or anions between compounds. In this case, a metal oxide reacts with a nonmetal oxide to form a ternary salt compound.
The reaction is likely a double displacement reaction, where the metal ions from the metal oxide and the nonmetal ions from the nonmetal oxide switch partners to form new compounds. The ternary salt may also participate in exchanging ions with the other compounds.
Reaction between a metal oxide and a nonmetal oxide to produce a salt containing at least three elements is a synthesis reaction. The salt almost always contains at least one monatomic metal cation and at least one polyatomic anion that contains all of the elements of the reacted nonmetal oxide plus the oxygen atoms from the metal oxide. This type of anion is called an "oxyanion" or the "anion of an oxyacid."