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What properties of water are unusual? How does hydrogen bonding explain some of these unusual properties?

Short Answer

Expert verified
Water's unusual properties include high surface tension, boiling/freezing points, specific heat capacity, density anomaly, and solvent ability. Hydrogen bonding explains these properties by influencing molecular interactions and structure.

Step by step solution

01

Identify the Unusual Properties

Water has several unusual properties. Some of these include: 1) High surface tension, 2) High boiling and freezing points compared to other similar molecules, 3) High specific heat capacity, 4) Density anomaly as solid ice, and 5) Exceptional solvent ability.
02

Understand Hydrogen Bonding

Hydrogen bonding is a type of weak bond that occurs when a hydrogen atom, which is covalently bonded to a highly electronegative atom, experiences attraction to another electronegative atom. In water, the hydrogen bonds form between the hydrogen atom of one water molecule and the oxygen atom of another.
03

Connect High Surface Tension with Hydrogen Bonding

Water's high surface tension is due to the hydrogen bonds that form between water molecules at the surface, creating a sort of 'skin' that is harder to break. This allows water to form droplets and enables insects, like water striders, to walk on water's surface.
04

Explain High Boiling and Freezing Points

The high boiling and freezing points of water are a result of hydrogen bonds. These bonds require significant energy to break, leading to water boiling at a much higher temperature than similar molecules without hydrogen bonds. Likewise, these bonds help maintain a structured solid form as ice at higher temperatures than other similar molecules.
05

Discuss High Specific Heat Capacity

Water's capacity to absorb heat without a large change in temperature is due to hydrogen bonds, which absorb energy and slow down heating. This property helps moderate Earth's climate and maintain life-supporting temperature ranges.
06

Analyze Density Anomaly

In solid form (ice), water is less dense than in liquid form because of hydrogen bonds, which arrange water molecules into a lattice structure that occupies more space. This makes ice float on liquid water.
07

Relate Solvent Ability to Hydrogen Bonding

Water's exceptional ability to dissolve various substances is due to its polarity and hydrogen bonding. It can interact with different polar molecules and ions, thus facilitating solubility.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Unusual Properties of Water
Water is a remarkable substance with several unusual properties that set it apart from many other liquids. These unusual characteristics are essential to support life as we know it. Hydrogen bonding plays an instrumental role in endowing water with these unique properties. For instance, consider water's ability to achieve high surface tension and a high specific heat capacity. Another intriguing property of water is its density anomaly when frozen into ice. Water also acts as an exceptional solvent for a wide variety of substances, which further emphasizes its uniqueness among liquids.
High Surface Tension
The high surface tension of water is mainly due to hydrogen bonding, which creates a strong 'skin' on the water's surface. Water molecules at the surface are pulled inwards by hydrogen bonds with other water molecules below. This inward pull makes the surface compact and resistant to external forces.

Because of this effect, water can form droplets on surfaces, and insects such as water striders can stand on water without sinking. This is why water can hold onto leaves, forming beautiful dew drops in the morning. Water's high surface tension is crucial for many biological processes, including transporting nutrients in plants and performing certain animal activities.
Density Anomaly of Ice
One of the most intriguing properties of water is its behavior upon freezing. Unlike most substances, water expands when it freezes due to the hydrogen bonds forming a lattice structure. In ice, each water molecule forms hydrogen bonds with others, resulting in a hexagonal lattice that takes up more space than when water is in its liquid state.

This structure makes ice less dense than liquid water, allowing it to float. This floating ice creates an insulating layer on bodies of water, protecting aquatic life during freezing temperatures. It is essential for maintaining ecosystems in cold environments by preventing bodies of water from freezing solid. This anomaly also affects global sea levels and climate systems.
Exceptional Solvent Ability
Water is often referred to as the 'universal solvent' because of its remarkable ability to dissolve a wide range of substances. This ability stems from water's polar nature and its ability to form hydrogen bonds with various molecules. Water molecules can surround and interact with charged particles, such as ions, or other polar molecules, effectively dissolving them.

This property is vital for life on Earth as it allows water to carry nutrients, minerals, and gases, which are essential for biological processes in living organisms. In the human body, for example, blood utilizes water to transport oxygen, nutrients, and waste products to and from cells. Water's solvent properties also play a crucial role in Earth's climate and weather systems, by sustaining the water cycle and influencing both weather patterns and climate stability.

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Most popular questions from this chapter

Metallic magnesium has a hexagonal close-packed structure and a density of \(1.74 \mathrm{~g} / \mathrm{cm}^{3}\). Assume magnesium atoms to be spheres of radius \(r\). Because magnesium has a close-packed structure, \(74.1 \%\) of the space is occupied by atoms. Calculate the volume of each atom; then find the atomic radius, \(r\). The volume of a sphere is equal to \(4 \pi r^{3} / 3\).

The halogens form a series of compounds with each other, which are called interhalogens. Examples are bromine chloride (BrCl), iodine bromide (IBr), bromine fluoride (BrF), and chlorine fluoride (CIF). Which compound is expected to have the lowest boiling point at any given pressure? Explain.

For the hydrogen halides and the noble gases, we have the following boiling points: \(\begin{array}{ll}\text { Halogen Family, }{ }^{\circ} \mathrm{C} & \text { Noble Gases, }^{\circ} \mathrm{C} \\ \mathrm{HF}, 19 & \mathrm{Ne},-246 \\\ \mathrm{HCl},-115 & \mathrm{Ar},-186 \\ \mathrm{HBr},-67 & \mathrm{Kr},-152 \\\ \mathrm{HI},-35 & \mathrm{Xe},-108\end{array}\) Account for the following: a. The general trend in the boiling points of the hydrides and the noble gases. b. The unusual boiling point of hydrogen fluoride. c. The observation that the hydrogen halides have boiling points that are significantly higher than the noble gases.

Calculate the percent of volume that is actually occupied by spheres in a body-centered cubic lattice of identical spheres. You can do this by first relating the radius of a sphere, \(r\), to the length of an edge of a unit cell, \(l .\) (Note that the spheres do not touch along an edge but do touch along a diagonal passing through the body-centered sphere.) Then calculate the volume of a unit cell in terms of \(r\). The volume occupied by spheres equals the number of spheres per unit cell times the volume of a sphere \(\left(4 \pi r^{3} / 3\right)\)

Describe the structure of a nematic liquid crystal. How is it similar to a liquid? How is it similar to a crystalline solid?

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