Explain each of these properties of water, and describe how each is conferred by the dipolar nature of a water molecule: high specific heat capacity; high heat of vaporization; unique density behavior; high surface tension; capacity to be a good solvent for ions of salts.
To explain: The properties of water including high specific heat capacity, the high heat of vaporization, high surface tension, a good solvent for ions and unique density and also how these properties are conferred by the dipolar nature of a molecule of water.
Introduction: Water is very important for maintaining life on earth. It is the most abundant compound. It forms 70% of a living individual.
Explanation of Solution
Water consists of several unique properties. These properties play an essential role in the living world. Hydrogen bonds are present between two adjacent molecules of water that underlie all these properties.
- High specific heat capacity- To increase the temperature of 1 g of water to 1°C, 1 calorie is needed. Water has the highest thermal capacity than other liquid. This energy is used for breaking hydrogen bonds and increases kinetic energy.
- High heat of vaporization- To convert 1g of water to vapor, it requires more than 500 calories. Hence, water has a high heat of vaporization.
- Unique density behavior- Water has a unique density behavior when there is a change in temperature. Most of the liquid forms become denser when the temperature decreases. However, water is the only one who reaches its maximum point of density, that is, at 4°C and can still remain a liquid.
- High surface tension- Water has exceeding surface tension than any liquid except mercury. Cohesiveness produces by hydrogen bonding is important for regulating protoplasmic form, which results in creating an ecological niche for insects.
- Good solvent- Water is a very good solvent. The dipolar nature of water created this property. It causes water molecules to revolve around charged ions.
Solvents that lack dipolar nature are less effective in keeping the ions separated.
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Chapter 2 Solutions
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