Classify the following processes as exothermic or endothermic.
Reaction between Na and H2O

Explanation

To classify the reaction between sodium (Na) and water (H2O) as exothermic or endothermic, we can follow these steps:

### Step 1: Understand the Definitions
- **Exothermic Reaction**: A reaction that releases heat to the surroundings.
- **Endothermic Reaction**: A reaction that absorbs heat from the surroundings.

### Step 2: Identify the Reaction
The reaction between sodium and water can be written as:
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