Define hydrogen bond. Is it weaker or stronger than the van der Waals' forces?

Explanation

### Step-by-Step Solution

1. **Definition of Hydrogen Bond**:
A hydrogen bond is a weak force of interaction that occurs between a hydrogen atom and an electronegative atom. The electronegative atoms that typically participate in hydrogen bonding include nitrogen (N), oxygen (O), and fluorine (F).

2. **Types of Hydrogen Bonds**:
Hydrogen bonds can be classified into two types:
- **Intermolecular Hydrogen Bonds**: These occur between different molecules.
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