What is the name for a type of reaction that does not go all the way to completion but reaches an equilibrium ?

Explanation

To answer the question, "What is the name for a type of reaction that does not go all the way to completion but reaches an equilibrium?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Reaction Types**:
- Reactions can be classified into two main types: irreversible and reversible reactions. Irreversible reactions go to completion, meaning all reactants are converted to products. In contrast, reversible reactions can proceed in both forward and backward directions.

2. **Defining Reversible Reactions**:
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