5 Properties of Water - Owlcation - Education
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5 Properties of Water

5-properties-of-water

What are the Main Properties of Water?

This article will discuss the five main properties of water:

  1. Its attraction to polar molecules
  2. High-specific heat
  3. High heat of vaporization
  4. The lower density of ice
  5. High polarity
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1. Water's Attraction to Other Polar Molecules

Cohesion

Cohesion, otherwise known as water's attraction to other water molecules, is one of the major properties of water. Water's polarity lends it to be attracted to other water molecules. The hydrogen bonds in water hold other water molecules together. Due to water's cohesiveness:

  • Liquid water has surface tension. This allows for insects, such as Water Striders, to walk on water.
  • Water is a liquid at moderate temperatures, and not a gas.

Adhesion

Water's attraction between molecules of a different substance is called adhesion. Water is adhesive to any molecule it can form hydrogen bonds with. Due to water's adhesiveness:

  • Capillary action occurs. For example, when you have a narrow tube in water, the water will rise up the tube because of water's adhesiveness to the glass "climbing" up the tube.

2. Water's High-Specific Heat

Water can moderate temperature because of the two properties: high-specific heat and the high heat of vaporization.

High-specific heat is the amount of energy that is absorbed or lost by one gram of a substance to change the temperature by 1 degree celsius. Water molecules form a lot of hydrogen bonds between one another. In turn, a lot of energy is needed to break down those bonds. Breaking the bonds allows individual water molecules to move freely about and have a higher temperature. In other words: if there are a lot of individual water molecules moving about, they’ll create more friction and more heat, which means a higher temperature.

The hydrogen bonds between water molecules absorb the heat when they break and release heat when they form, which minimizes temperature changes. Water helps maintain a moderate temperature of organisms and environments.

Water takes a long time to heat up, and holds its temperature longer when heat is not applied.

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3. Water's High Heat of Evaporation

Water's high heat of vaporization is the other property responsible for its ability to moderate temperature.

Water's high heat of evaporation is basically the amount of heat energy needed to change a gram of liquid into gas. Water also needs a lot of energy in order to break down the hydrogen bonds. The evaporation of water off a surface causes a cooling effect. Much like among humans—when we get hot, or energy inside our body is breaking chemical bonds, we sweat as a cooling effect. In this case, the same process occurs: as the water evaporates off the the surface of the skin, it cools down the surface.

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4. The Lower Density of Ice

At cooler temperatures, the hydrogen bonds of water molecules form ice crystals. The hydrogen bonds are more stable and will maintain its crystal-like shape. Ice—the solid form of water—is less dense than water because of the hydrogen bonds being spaced out and being relatively apart. The low density is what allows icebergs to float and are the reason that only the top part of lakes are frozen.

5. Water's High Polarity

Water is a polar molecule that has a high level of polarity and attraction to ions and other polar molecules.

Water can form hydrogen bonds, which make it a powerful solvent. Water molecules are attracted to other molecules that contain a full charge, like an ion, a partial charge, or polar. Salt (NA+ CL-) dissolves in water. Water molecules surround the salt molecules and separate the NA+ from the CL- by forming hydration shells around those two individual ions.

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1) cohesion

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