In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Urine volume was increased , while urine osmolality and free water reabsorption were decreased .
### Output Text:
Urine volume was increased , while urine osmolality and free water reabsorption were decreased . 