How do I know if a double displacement reaction occurs?

How do I know if a double displacement reaction occurs?

Answer 1:

• Two compounds with positive and negative ions.
• A difference in electro negativity or reactivity between the anions or cations.
• One of the new compounds in the product must be somewhat insoluble so that it comes out of solution.

Explanation:
For a double replacement to take place there must be two positive and two negative ions.

\(\left(A^{+} X^{-}\right)+\left(B^{+} Y^{-}\right)==\left(A^{+} Y^{-}\right)+\left(B^{+} X^{-}\right)\)

A must be able to replace B. This will only happen if A is more reactive that B.
\(\left(A^{+} Y^{-}\right)\) must be insoluble so it forms a solid and comes out of solution.

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Answer 2:
You must make either (a) a precipitate or (b) a gas or (c) a nonelectrolyte.

Explanation:
A double displacement reaction is a chemical reaction in which two compounds react, and the positive ions (cations) switch partners with the negative ions (anions) to form two new products.

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(From Study.com)