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Answer

a. Single displacement

b. Decomposition

When classifying chemical reactions, consider how reactants change to form the products.

An equation for a chemical reaction has a left side and a right side. The arrow separates the left and right sides.

  • The left side is called the reactants.
  • The right side is called the products.

Each product or reactant can be one or more elements.

Some Types of Reactions

We can use letters* to represent products and reactants in a reaction.

Synthesis

Two reactants become one product.

  • A + B  →  AB

Decomposition

One reactant becomes two products.

  • AB  →  A + B
  • In equation (b), this is like how NH₃ separated into two products, N₂ and H₂.

Single Displacement

Start with two reactants, a compound and an element. To form the products, the element replaces one of the elements that was in the compound.

  • AB + C  →  AC + B
  • In equation (a), this is like how Mg replaced Fe. Fe was part of a compound at first. Now, Mg is part of a compound instead.

Double Displacement

Start with two reactants that are compounds. To form the products, an element from each compound replaces each other.

  • AB + CD  →  AC + BD

Therefore, equation (a) is a single displacement reaction and equation (b) is a decomposition reaction.

*Each letter represents an element. Two elements make a compound. A letter can also represent a compound if compound stays together during the reaction.

Learn more about displacement reactions here:

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