The science of water powerpoint slide set introduces the structure of water that accounts for water s unique properties based on the quantum mechanical model of the atom, the shape of the water molecule and the distribution of charge. Johnson research foundation, university of pennsylvania, philadelphia, pennsylvania, usa water is a major component of all living things. Have students complete the differentiated activities found on the attached physical and chemical properties of water handout. Alternatively, microftir spectra have been used to study the effect of composition of aerosol particles on the hygroscopic properties of nacl. The unique and unusual properties of water pdh online. You are not limited to the three properties discussed in part a. Water is one of the most unique and ubiquitous substances on our earth. This worksheet will help prepare you for participating in the properties of water lab investigation part 2. The high specific heat of the water makes it absorb or lose a large amount of the heat without changing its temperature. The various contributions assembled in the present book represent the breadth of topics discussed during a symposium held in varenna, italy under the auspices of the john templeton foundation on april 2930, 2005 with the title water of life. Comments are turned off autoplay when autoplay is enabled, a suggested video will automatically play next.
Some are essential for life while others have profound effects on. All solutes in the dilute solutions modify the water properties. What are the properties of water that render it so suited to its role as the medium of life. Buoyancy the ability of a fluid to exert an upward force on an object that is immersed in the fluid. The physical and the chemical properties of the water. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Counterfactual chemistry and finetuning in biochemistryan inquiry into the peculiar properties of water related to l. Wax is a nonpolar substance, thus water molecules are only being pulled toward each other, forming a sphere. The water has a high specific heat you notice that the temperature of the human body does not change by changing the atmospheric temperature. Fundamental characteristics of water chemistry libretexts. Water its properties and role in the environment outline. Chapter 2 biochemistry unique properties of water life on earth could not exist without water. The major chemical and physical properties of water are. Physical and chemical properties of water water is a chemical.
Waters polarity lends it to be attracted to other water molecules. Unique properties of water 1 all 3 forms solid, liquid, gas can be found naturally on the earth 2 the solid phase is less dense than the liquid phase causes it to float 3 has a large specific heat capacity retains heat well 4 has a maximum density over all phases at 4 oc 5 is a liquid at normal temperatures. To irrigate each soil to a three foot depth, you need to. It is anomalous in many of its physical and chemical properties. Using a pipette count how many drops of water you can place on a penny without letting it spill off. Cohesion refers to the fact that water sticks to itself very easily. Physical and chemical properties of water university of arizona. Solid state ice liquid state liquid water gas state.
Water is the material cause of all things thales, 624546 bc. To examine, measure and explain some of the unique properties of water. Summarize in point form the unique properties of water. Ice also appears colourless, and water vapour is essentially invisible as a gas. The unusual properties of water are mainly due to three factors.
The chemical properties of the water the weakness of the water ionization. The colour of water and ice is, intrinsically, a very slight blue hue, although water appears colourless in small quantities. The hydrogen bonds in water hold other water molecules together. Water h 2o is a polar inorganic compound that is at room temperature a tasteless and. Limnology 101 courtesy of lake partnerships wisconsin department of natural resources wisconsin association of lakes university of wisconsin extension. Moreover, a unique combination of stxm and afm has been utilized to quantify density and. Water s structure and properties account for many of the phenomena in our bodies and on our earth. Paper towels are more polar than office paper, thus paper towels actually break the surface tension of water to absorb it. The unique and unusual properties of water charles riley, jr. Water is an essential ingredient of animal and plant life crediting to its unique physical, chemical and biological properties.
If you look at the periodic table and locate tellurium atomic number. Surface tension, heat of vaporization, and vapor pressure. Water s heat capacity stores a lot of heat which is why it is difficult to boil water. Water is a unique, ubiquitous substance that is a major. The hydrogen bond between water molecules that we talked about in the first section is the reason behind two of water s unique properties. Its nature and properties haveintriguedphilosophers,naturalistsandscientistssince antiquity.
The present post describes the physical, chemical and unusual properties of water. Specific heat is the amount of energy required tochange the temperature of a substance. All of waters unique physical properties are caused by waters polarity. Polar covalent bonds are a type of covalent bond and means unequal sharing of electrons. Polarity is the uneven distribution of charge on a molecule. Cohesion, otherwise known as waters attraction to other water molecules, is one of the major properties of water. However, water is a universal solvent, and natural waters contain dissolved substances present in the environment. The river flow is highly variable in time, depending on the climatic situation and the drainage pattern.
Adhesion cohesion condensation dissolve evaporation freezing melting negative polar positive sublimation surface tension universal solvent 1. Complete the worksheet written or print and submit it with your recorded observations at the end of the lab. Rivers are characterised by unidirectional current with a relatively high, average flow velocity ranging from 0. Water continues to engage the attention of scientists today as it remains incompletely understood in spite of. Oxygen has a larger electronegativity than hydrogen, so the electron pairs are pulled in closer to the oxygen atom, giving it a partial negative charge. The medium of life water is a major chemical component of the earths surface. Adhesion the tendency of water to stick to other substances. A pond that is thermally stratified simply means that there is a noticeable temperature gradient as the water get deeper. The basic data for the properties of pure water, which are found in the crc handbook of chemistry and physics 1, are useful for food scientists.
The electrons are not shared equally between the hydrogen and oxygen atoms of water creating a polar molecule. Office paper has a coating which is more polar than wax, but less polar than paper towels. The reason for many of liquid waters special properties originates from the water molecules consisting of dipoles that associate through intermolecular hydrogen. Water has several other unique physical properties. Within the earths atmosphere and surface, the liquid phase is the most common and is the form that is generally denoted by the word water. However, these bonds are strong enough to create many of the peculiar properties of water, some of which make it integral to life. Functions and properties of water introduction water is one of the most common and most important substances on the earths surface. It isessential for the existence oflife,and the kinds and amounts of vegetation occurring on various parts of the earths surface depend more on the quantity of water available than on any other single environmental factor. Water provided conditions for the origin, evolution, and flourishing of life. Pdf physical, chemical and biological characteristics of.
Subsequently, both of the hydrogen atoms take on a partial positive charge. Physical, chemical and biological properties of water. Water has many unusual properties because of its polar covalent bonds. Unusual properties of water for life easybiologyclass. Its hydrogen bonding causes its many unique properties, such as having a solid form less dense than its. The unique properties of water are essential to the biochemistry responsible for all life. You may have noticed this in summer while swimming. During precipitation water passes over and through the ground, acquiring a wide variety of dissolved or suspended impurities that profoundly affect its usefulness. Some of waters unique properties are literally essential for life, while others have. The properties of water can best be understood by considering the structure. During precipitation water passes over runoff and through the ground infiltration, acquiring a wide variety of dissolved or suspended impurities that intensely alters its usefulness.
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