Water in Our life

Water and It s Importance for Us

the learning objective:
• To draw together various items of chemistry that reveal the uniqueness of water for metabolic processes.
• To consider the properties of water vapour and steam.
• To briefly consider the uses of ice.
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1. What is the chemical formula for water?
2. Complete and balance this equation: 2H2 +O2 -----------»
3. Complete this word equation: solute + solvent -----------»
4. Water forms two ions. What are they?
5. The process that allows only a solvent like water to pass through a semi-permeable membrane is called what?
6. The process that allows water and small molecules and ions to pass through a membrane is called what?
7. Soaps and detergents have something special about their molecules. What is it?
8. Water is a small molecule and would be expected to boil at a low temperature.
What makes it boil at the high temperature of 100 °C?
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The solubility of drugs and medicines in either water or fats plays an important part in administering the active components to the sites where they are needed. Water solubility is very important when drugs are taken orally as they usually have to dissolve in gastric fluids before being taken up and transported to the parts of the body where they are needed, for example soluble aspirin. Some drugs, when they reach the site, dissolve in the fluids of the cells and are used by the cells for treatment of the ailment.
The pH of the organ or cell environments also affect solubility and this can be used to dispense drugs to where they are most needed. Some drugs are