In what cases are the substances taken in pairs, the formulas of which are given below

| December 15, 2020 | education

In what cases are the substances taken in pairs, the formulas of which are given below, enter into exchange reactions that go to the end: a) Ca and H2O; b) KOH and FeCl3; c) NaCl and KNO3; d) MgO and H2SO4. Write molecular, complete and concise ionic reaction equations. Please explain.

Answer: b; d.

Exchange reactions are reactions between complex substances, as a result of which their constituent parts are exchanged.

Exchange reactions go to the end in those cases when either gas, or water, or a precipitate is formed.

The reactions will go to the end between potassium hydroxide and iron (III) chloride – (under the letter b).

As a result of the reaction, iron (III) hydroxide is formed.

Under the letter d: the reaction between magnesium oxide and sulfuric acid goes to the end, since water is formed as a result of the reaction.

a) the reaction between calcium and water is a substitution reaction, since it occurs between a simple and a complex substance.

c) the reaction between sodium chloride and potassium nitrate is reversible, neither gas, nor water, nor precipitate is formed.



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